All-optical logic gate based on two-dimensional material purple phosphorus, verification method of all-optical logic gate, optical calculation chip and system

Abstract

The invention relates to the technical field of photon information devices, in particular to an all-optical logic gate based on two-dimensional material purple phosphorus, a verification method of the all-optical logic gate, an optical calculation chip and a system. The second light path is provided with a second purple phosphorus unit; the signal receiving module is provided with a third purple phosphorus unit; the third purple phosphorus unit is located in the intersection area of the first light path and the second light path. According to the method, a basic Gaussian beam is changed into a diffraction ring based on spatial self-phase modulation by utilizing the nonlinear optical characteristic of two-dimensional material purple phosphorus, and the variation relationship between the nonlinear refractive index of the purple phosphorus and the light intensity is utilized, so that 0 and 1 signals are generated; and then, based on space cross phase modulation, the control light of the first light path controls the phase change of the signal light by influencing the wavefront radius of the signal light of the second light path, so that the 0 and 1 change of the output light signal is realized, and the logic operation of the corresponding logic gate is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photonic information devices, in particular to a full-optical logic gate based on two-dimensional material purple phosphorus and a verification method thereof, an optical computing chip and a system. BACKGROUND

[0002] With the rapid development of the Internet, the demand for data throughput is growing explosively. However, due to the physical limitations of "Moore's Law", traditional optoelectronic devices are gradually difficult to meet the growing demand and are trapped in a development bottleneck. The frequent photoelectric conversion of traditional optoelectronic hybrid devices makes the performance of optoelectronic devices far below the theoretical speed limit, and there are limitations in bandwidth, power consumption and speed, which has become a key factor restricting development. Therefore, it is an urgent need to find a new information conversion method. At present, the information conversion method of photonic circuit has been widely recognized as the most potential alternative, which has the advantages of high transmission rate, large bandwidth and excellent concurrency in the transmission process, and can overcome the electronic bottleneck caused by the small size of electronic components, which is of great significance.

[0003] The full-optical logic gate is an important full-optical modulator, which completely uses optical signals for operation and is based on the nonlinear effects of light (such as spatial self-phase modulation) or interference, scattering and absorption principles, uses the characteristics of light (such as intensity, phase, polarization state, etc.) to represent logic states "0" and "1", and completes logic operations through the interaction between light and light. At present, the existing full-optical logic gate mainly includes a full-optical input logic gate based on a heterojunction, a full-optical logic gate based on a geometric phase principle, and a full-optical logic gate using a terahertz light asymmetric demultiplexer, etc. However, in these full-optical logic gate technologies, part of them can only realize a single logic function or need different designs, and the other part has a complex structure or has strict requirements for phase determination, which cannot meet the needs of large-scale integration and performance.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a full-optical logic gate based on two-dimensional material purple phosphorus and a verification method thereof, an optical computing chip and a system, which aims to solve the problems that the existing full-optical logic gate can only realize a single logic function and has a complex structure.

[0006] The technical scheme of the present application is as follows: A full-optical logic gate based on two-dimensional material purple phosphorus, comprising: A first light path is provided with a first purple phosphorus unit; the first light path is used to generate control light and carry a first logic state; A second light path is provided with a second purple phosphorus unit; the second light path is used to generate signal light and carry a second logic state; A signal receiving module is provided with a third purple phosphorus unit; the third purple phosphorus unit is located at the intersection of the first light path and the second light path. Among them, the first purple phosphorus unit, the second purple phosphorus unit and the third purple phosphorus unit are all composed of purple phosphorus nanosheet dispersion liquid.

[0007] The all-optical logic gate based on two-dimensional material purple phosphorus, wherein the concentration of the purple phosphorus nanosheet dispersion liquid in the first purple phosphorus unit and the second purple phosphorus unit is lower than the concentration of the purple phosphorus nanosheet dispersion liquid in the third purple phosphorus unit.

[0008] The all-optical logic gate based on two-dimensional material purple phosphorus, wherein the concentration of the purple phosphorus nanosheet dispersion liquid is 0.01-0.20mg / mL; the ratio of the concentration of the purple phosphorus nanosheet dispersion liquid in the first purple phosphorus unit to the concentration of the purple phosphorus nanosheet dispersion liquid in the third purple phosphorus unit is (1:5)-(1:20); the ratio of the concentration of the purple phosphorus nanosheet dispersion liquid in the second purple phosphorus unit to the concentration of the purple phosphorus nanosheet dispersion liquid in the third purple phosphorus unit is (1:5)-(1:20).

[0009] The all-optical logic gate based on two-dimensional material purple phosphorus, wherein in the purple phosphorus nanosheet dispersion liquid, the number of layers of the purple phosphorus nanosheet is 2-13 layers, the thickness of the purple phosphorus nanosheet is 2.2nm-14.3nm, and the band gap of the purple phosphorus nanosheet is 1.5eV-2.2eV.

[0010] The all-optical logic gate based on two-dimensional material purple phosphorus, wherein the first light path comprises a first laser, a first light intensity adjusting component, a first focusing assembly and the first purple phosphorus unit arranged in sequence along the light propagation direction.

[0011] The all-optical logic gate based on two-dimensional material purple phosphorus, wherein the second light path comprises a second laser, a second light intensity adjusting component, a second focusing assembly, a second purple phosphorus unit and a mirror group arranged in sequence along the light propagation direction.

[0012] The all-optical logic gate based on two-dimensional material purple phosphorus, wherein the signal receiving module further comprises an optical stop and a power meter arranged in sequence along the light propagation direction; the third purple phosphorus unit is arranged on the side of the optical stop away from the power meter.

[0013] An optical computing chip, the optical computing chip is integrated with the all-optical logic gate based on two-dimensional material purple phosphorus, and is configured to complete Boolean logic operation on the optical layer.

[0014] A data center optical switching system comprising the all-optical logic gate based on two-dimensional material purple phosphorus, used for Boolean logic processing of data packet headers in the optical layer.

[0015] A verification method of an all-optical logic gate based on two-dimensional material purple phosphorus, comprising the steps of: Obtaining the optical field mode of the first purple phosphorus unit and the second purple phosphorus unit; If the optical field mode of the first purple phosphorus unit is logic value 1 and the optical field mode of the second purple phosphorus unit is logic value 1, it is judged whether the optical field mode of the signal receiving module is logic value 1, and if so, the logic function of the all-optical AND gate is normal. If the optical field mode of the first purple phosphorus unit is logic value 1 and the optical field mode of the second purple phosphorus unit is logic value 0, it is judged whether the optical field mode of the signal receiving module is logic value 0, and if so, the logic function of the all-optical AND gate is normal. If the optical field mode of the first purple phosphorus unit is logic value 0 and the optical field mode of the second purple phosphorus unit is logic value 1, it is judged whether the optical field mode of the signal receiving module is logic value 0, and if so, the logic function of the all-optical AND gate is normal. If the optical field mode of the first purple phosphorus unit is logic value 0 and the optical field mode of the second purple phosphorus unit is logic value 0, it is judged whether the optical field mode of the signal receiving module is logic value 0, and if so, the logic function of the all-optical AND gate is normal. Wherein, the definition of the logic value is that the basic Gaussian light with bright far-field center or the concentric diffraction circle is logic value 1, and the diffraction circle with dark far-field center is logic value 0.

[0016] Beneficial effects: the application provides a full-optical logic gate based on two-dimensional material purple phosphor and a verification method, an optical computing chip and a system thereof. The full-optical logic gate based on two-dimensional material purple phosphor comprises: a first light path provided with a first purple phosphor unit; the first light path is used for generating control light and carrying a first logic state; a second light path provided with a second purple phosphor unit; the second light path is used for generating signal light and carrying a second logic state; a signal receiving module provided with a third purple phosphor unit; the third purple phosphor unit is located at an intersection area of the first light path and the second light path; wherein the first purple phosphor unit, the second purple phosphor unit and the third purple phosphor unit are all composed of a purple phosphor nanosheet dispersion liquid. The application utilizes the nonlinear optical characteristics of two-dimensional material purple phosphor, first makes a basic Gaussian light beam into a diffraction circle based on spatial self-phase modulation, utilizes the change relationship between the nonlinear refractive index of purple phosphor and light intensity to make it satisfy the generation of '0' and '1' signals; then based on spatial cross-phase modulation, the control light of the first light path controls the phase change of the signal light of the second light path by affecting the wavefront radius of the signal light, realizes the '0' and '1' change of the output light signal, so as to satisfy the logic operation of the corresponding logic gate; wherein the basic Gaussian light with a bright far-field center or the concentric diffraction circle is defined as the logic state '1', and the diffraction circle with a dark far-field center is defined as the logic state '0'; in addition, due to the strong saturated absorption response and excellent physical properties of the purple phosphor nanosheet, the full-optical logic gate realized by the application has the advantages of simple structure, easy manufacturing, low cost and easy integration. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a system structure schematic diagram of the full-optical logic gate based on two-dimensional material purple phosphor. Figure 2 It is a definition diagram of the state value of the full-optical logic gate. Figure 3 It is a test result diagram of the full-optical logic gate. The reference signs are as follows: the first light path 10, the first purple phosphor unit 11, the first laser 12, the first optical attenuator 13, the first optical lens 14, the second optical lens 15, the second light path 20, the second purple phosphor unit 21, the second laser 22, the second optical attenuator 23, the third optical lens 24, the mirror combination 25, the first mirror 251, the second mirror 252, the third mirror 253, the fourth optical lens 26, the signal receiving module 30, the third purple phosphor unit 31, the diaphragm 32 and the power meter 33. DETAILED DESCRIPTION

[0018] This invention provides an all-optical logic gate based on the two-dimensional material purple phosphorus, its verification method, an optical computing chip, and a system. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0020] In current designs, two-dimensional materials have gained widespread attention due to their unique structure and optical, electrical, and mechanical properties, and are emerging in the field of optoelectronic information, meeting the needs of optical communication, optical computing, and other fields. Two-dimensional layered materials possess high carrier mobility, strong light-matter interaction, and strong mechanical toughness. Their optoelectronic properties can be altered by controlling the number of layers, achieving an extremely wide spectral response range. However, existing all-optical logic gates can only implement a single logic function and have complex structures.

[0021] Purple phosphorus, as a two-dimensional material, is a direct bandgap semiconductor with a thickness-dependent bandgap. It also possesses excellent optoelectronic properties, such as superior broadband saturable absorption, stronger in-plane anisotropy, and higher thermal stability, making it a promising nonlinear photonic material.

[0022] Based on this, such as Figure 1 As shown, this invention provides an all-optical logic gate based on the two-dimensional material purple phosphorus, comprising: The first optical path 10 is provided with a first purple phosphor unit 11; the first optical path is used to generate control light and carry a first logic state. The second optical path 20 is provided with a second phosphorescent unit 21; the second optical path 20 is used to generate signal light and carry a second logic state. The signal receiving module 30 is provided with a third purple phosphor unit 31; the third purple phosphor unit 31 is located in the intersection area of ​​the first optical path 10 and the second optical path 20; The first purple phosphorus unit 11, the second purple phosphorus unit 21 and the third purple phosphorus unit 31 are all composed of a purple phosphorus nanosheet dispersion.

[0023] In the embodiment, based on spatial self-phase modulation, the basic Gaussian light beam is first changed into a diffraction circle ring by using the third-order nonlinear optical characteristics of the two-dimensional material purple phosphorus, and the "0" and "1" signal generation is realized by using the change relationship between the nonlinear refractive index of the purple phosphorus and the light intensity; then, based on spatial cross-phase modulation, the phase change of the signal light is controlled by the wavefront radius of the signal light of the second light path affected by the control light of the first light path, the "0" and "1" change of the output light signal is realized, and the logic operation corresponding to the logic gate is realized; wherein, the basic Gaussian light with a bright far field center or the concentric diffraction circle ring is defined as the logic state "1", and the diffraction circle ring with a dark far field center is defined as the logic state "0"; in addition, since the purple phosphorus nanosheet exhibits strong saturated absorption response and excellent physical properties, the all-optical logic gate realized by using the application has the advantages of simple structure, easy manufacturing, low cost and easy integration.

[0024] Specifically, the first light path is configured to generate control light and make the control light carry a first logic state; the second light path is configured to generate signal light and make the signal light carry a second logic state; and the third purple phosphorus unit is located in the intersection area of the first light path and the second light path and is configured to map the first logic state onto the far-field diffraction pattern of the signal light by spatial cross-phase modulation, amplify the cross-phase modulation depth by using the concentration gradient of the purple phosphorus nanosheet dispersion liquid, reduce the number of logic operations and the switching threshold, and thereby output a combined logic result corresponding to the first logic state and the second logic state; based on the above principle, the all-optical logic gate based on the two-dimensional material purple phosphorus can stably realize at least seven kinds of basic Boolean logic operations such as "and", "or" and "not" on a single device, and since the purple phosphorus nanosheet is a two-dimensional semiconductor material with adjustable band gap, it has wideband saturated absorption properties, good chemical stability and thermal stability, exhibits excellent nonlinear optical characteristics, has the advantages of simple structure, easy operation, low cost and easy integration, and can withstand high light intensity.

[0025] In the embodiment, the principle of spatial self-phase modulation is as follows: When the excitation light with Gaussian intensity distribution irradiates the nonlinear medium, the refractive index of the medium changes, the excitation light propagates in the medium and will undergo spatial self-phase modulation, the nonlinear phase shift generated causes the radial wavefront distortion of the light beam, and the light waves at different radial positions interfere in the far field region to form an interference diffraction ring. The phase shift after passing through the medium is:

[0026] wherein, I is the Gaussian light intensity distribution formula, and it can be seen from the above formula that, within the range of r , there must be two points r 1, r2, so that their slopes are equal, i.e. the light field is r 1 and r 2 have the same wave vector; therefore, the light at the two places can interfere, and a bright-dark alternating circular ring appears, the bright-dark of the circular ring mainly depends on the following formula:

[0027] When N is odd, the interference is destructive, and a dark fringe appears; N is even, the interference is constructive, and a pattern containing multiple concentric rings appears in the far field. Thus, the judgment criteria of the all-optical logic gate "0" and "1" signals in the present application are defined: the basic Gaussian light with a bright far field center and the diffracted circular ring are defined as the logic state "1"; the diffracted circular ring with a dark far field center is defined as the logic state "0". The conversion process between the logic states "0" and "1" is as follows: the radial light field distribution in a certain direction after the light transmits through the nonlinear medium and is diffracted can be calculated by the Kirchhoff integral. The Kirchhoff integral formula is:

[0028] wherein, R is the distance from the diffracted ring to the center of the diffracted ring, r is the radius at the optical device, d is the distance from the center of the circular ring to the surface of the violet phosphorus dispersion liquid, k 0=2πn0 / λ is the wave vector, λ is the wavelength of the light source in vacuum, J 0 is the first-order zero-order Bessel function, Φ L = k 0 r 2 (1 / d +1 / ρ ) / 2 is the linear phase shift, wherein, ρ = z 1{1+[π w 0 2 / (λ z 1)]2} is the curvature radius of the wave front at the violet phosphorus dispersion liquid, z 1 is the position of the violet phosphorus dispersion liquid away from the focal point of the lens on the optical axis; Φ NL = k 0n2LI0exp(-2 r 2 / w 0 2 ) is the nonlinear phase.

[0029] According to the above formula, the light field mode of the output signal light can be controlled from the following two directions: first, by moving the focusing lens along the optical axis, the position of the focal point of the control light relative to the focal plane of the signal light is changed, that is, the size of the displacement z 1 changes the radius of curvature ρ , thereby changing the linear phase shift Φ L ; second, by adjusting the attenuation lens, the light intensity of the input light is changed, thereby changing the nonlinear phase shift Φ NL ; both of which jointly affect the change of the phase of the output signal light, achieve the exchange of logic states "0" and "1", and finally complete the compilation and switching of the logic function.

[0030] In some embodiments, the concentration of the purple phosphorus nanosheet dispersion in the first purple phosphorus unit and the second purple phosphorus unit is lower than the concentration of the purple phosphorus nanosheet dispersion in the third purple phosphorus unit, thereby forming a concentration gradient structure for amplifying the effective nonlinear phase modulation depth of the intersection area; at the same time, the gradient concentration configuration can make the spatial cross-phase modulation depth higher than that of the homogeneous concentration structure under the same input light intensity. The logic state positioning is that the basic Gaussian light with a bright far-field center or the concentric diffraction ring is the logic state "1", and the diffraction ring with a dark far-field center is the logic state "0".

[0031] In some embodiments, the concentration of the purple phosphorus nanosheet dispersion is 0.01-0.20 mg / mL. When the concentration of the purple phosphorus nanosheet dispersion is lower than 0.01 mg / mL, the content of the purple phosphorus nanosheet is insufficient, resulting in weak third-order nonlinear effect and difficulty in meeting the demand of cross-phase modulation depth for logic state switching; when the concentration is higher than 0.20 mg / mL, the dispersion has too strong light absorption, and the attenuation of the signal light exceeds 30%, resulting in a decrease in the signal-to-noise ratio of the output logic signal; by controlling the concentration to be between 0.01-0.20 mg / mL, the nonlinear phase modulation depth can be realized on the basis of ensuring that the signal light transmittance is ≥75%, thereby meeting the core demand of logic operation on light field modulation.

[0032] In a preferred embodiment, the concentration of the purple phosphorus nanosheet dispersion in the first purple phosphorus unit is 0.05±0.02 mg / mL; the concentration of the purple phosphorus nanosheet dispersion in the second purple phosphorus unit is 0.05±0.02 mg / mL; and the concentration of the purple phosphorus nanosheet dispersion in the third purple phosphorus unit is 0.20±0.02 mg / mL.

[0033] More preferably, the concentration of the dispersed purple phosphorene nanosheet in the first and second purple phosphorene units is 0.05 mg / mL; the concentration of the dispersed purple phosphorene nanosheet in the third purple phosphorene unit is 0.20 mg / mL. The present application realizes the switching of at least seven logic gates without reconfiguration by the concentration gradient from 0.05 mg / mL upstream to 0.20 mg / mL at the intersection region, so as to realize the deep cross-phase modulation depth Δφ NL amplification, thereby realizing the switching of at least seven logic gates without reconfiguration in the same structure.

[0034] In some embodiments, the ratio of the concentration of the dispersed purple phosphorene nanosheet in the first purple phosphorene unit to the concentration of the dispersed purple phosphorene nanosheet in the third purple phosphorene unit is (1:5)-(1:20); the ratio of the concentration of the dispersed purple phosphorene nanosheet in the second purple phosphorene unit to the concentration of the dispersed purple phosphorene nanosheet in the third purple phosphorene unit is (1:5)-(1:20). By controlling the concentration ratio within the above range, the first and second purple phosphorene units only provide weak nonlinear modulation for the preliminary definition of the input light logic state, avoiding the generation of too many redundant diffraction components; the third purple phosphorene unit can provide a strong nonlinear response to improve the spatial cross-phase modulation depth.

[0035] In some embodiments, the number of layers of the purple phosphorene nanosheet in the dispersed purple phosphorene nanosheet is 2-13, the thickness of the purple phosphorene nanosheet is 2.2-14.3 nm, and the band gap of the purple phosphorene nanosheet is 1.5-2.2 eV. The purple phosphorene nanosheet under this parameter condition has excellent broadband saturable absorption, stronger in-plane anisotropy, and higher thermal stability.

[0036] In some embodiments, the first light path comprises, in sequence along the light propagation direction, a first laser, a first light intensity adjusting component, a first focusing assembly, and the first purple phosphorene unit. The first light path with this combination can generate the first logic state.

[0037] In some embodiments, the second light path comprises, in sequence along the light propagation direction, a second laser, a second light intensity adjusting component, a second focusing assembly, a second purple phosphorene unit, and a mirror group. The second light path with this combination is used to generate the second logic state and to couple the signal light to the intersection region in a small-angle non-collinear manner.

[0038] In some embodiments, the signal receiving module 30 further comprises an optical aperture 32 and a power meter 33 arranged in sequence along the light propagation direction; the third purple phosphor unit is arranged on the side of the optical aperture away from the power meter. The optical aperture is used to screen the far-field diffraction pattern of the signal light, only allowing the central spot or specific order diffraction light carrying the logic state information to pass through, filtering out the ambient stray light and invalid diffraction components, and ensuring the purity of the logic signal; the optical power meter is used to quantitatively collect the signal light power filtered by the optical aperture, accurately distinguish the logic state "0" (far-field center dark, power value lower than 5mW) and the logic state "1" (far-field center bright, power value higher than 20mW) through the power value difference, realize the quantitative output of the logic result, and provide data support for the power consumption and switching threshold performance verification of the all-optical logic gate.

[0039] Specifically, the first light path is sequentially provided with a first laser, a first attenuating mirror, a first focusing lens group, and a first purple phosphor unit along the light beam propagation direction; the second light path is sequentially provided with a second laser, a second attenuating mirror, a second focusing lens group, a second purple phosphor unit, and a mirror group along the light beam propagation direction; the first light path and the second light path are combined through a beam combination component, and then jointly incident on the third purple phosphor unit, and finally the output signal light is collected on the power meter after passing through an optical aperture.

[0040] In some embodiments, the light sources of the first laser and the second laser are both Gaussian continuous light laser sources.

[0041] In the present embodiment, the first light path 10 includes a first laser 12, a first optical attenuating mirror 13, a first optical lens 14, a first purple phosphor unit 11, and a second optical lens 15; the first laser is used to provide a control light source, the first optical attenuating mirror is used to adjust the light intensity of the control light, the first optical lens is used to focus the control light on the first purple phosphor unit, the first purple phosphor unit is used to generate a logic gate binary "0" or "1" signal, and the second optical lens is used to focus the control light on the third purple phosphor unit and adjust the size and position of the control light focal spot; the second light path 20 includes a second laser 22, a second optical attenuating mirror 23, a third optical lens 24, a second purple phosphor unit 21, a mirror combination 25, and a fourth optical lens 26; the second laser is used to provide a signal light source, the second optical attenuating mirror is used to adjust the light intensity of the signal light, the third optical lens is used to focus the signal light on the second purple phosphor unit, the second purple phosphor unit is used to generate a logic gate binary "0" or "1" signal, the mirror combination 25 includes a first mirror 251, a second mirror 252, and a third mirror 253, a total of three mirrors, which are used to adjust the angle of the signal light to make it converge at a small angle on the third purple phosphor unit; and the fourth optical lens is used to focus the signal light on the third purple phosphor unit.

[0042] In addition, the application also provides an optical computing chip, and the all-optical logic gate based on the two-dimensional material purple phosphorus is integrated on the optical computing chip and is configured to complete a Boolean logic operation at an optical level.

[0043] In addition, the application also provides a data center optical switching system, and the all-optical logic gate based on the two-dimensional material purple phosphorus is used to perform a Boolean logic processing on a data packet header at an optical level.

[0044] Meanwhile, the application also provides a verification method of the all-optical logic gate based on the two-dimensional material purple phosphorus, which comprises the following steps: Step S10: If the all-optical logic gate is an all-optical AND gate, the optical field mode of a first purple phosphorus unit and the optical field mode of a second purple phosphorus unit are obtained. Step S20: If the optical field mode of the first purple phosphorus unit is a logic value 1 and the optical field mode of the second purple phosphorus unit is a logic value 1, it is judged whether the optical field mode of a signal receiving module is a logic value 1, and if yes, the logic function of the all-optical AND gate is normal. Step S30: If the optical field mode of the first purple phosphorus unit is a logic value 1 and the optical field mode of the second purple phosphorus unit is a logic value 0, it is judged whether the optical field mode of a signal receiving module is a logic value 0, and if yes, the logic function of the all-optical AND gate is normal. Step S40: If the optical field mode of the first purple phosphorus unit is a logic value 0 and the optical field mode of the second purple phosphorus unit is a logic value 1, it is judged whether the optical field mode of a signal receiving module is a logic value 0, and if yes, the logic function of the all-optical AND gate is normal. Step S50: If the optical field mode of the first purple phosphorus unit is a logic value 0 and the optical field mode of the second purple phosphorus unit is a logic value 0, it is judged whether the optical field mode of a signal receiving module is a logic value 0, and if yes, the logic function of the all-optical AND gate is normal. The definition of the logic value is that a basic Gaussian light with a bright far-field center or a concentric diffraction circle is a logic value 1, and a diffraction circle with a dark far-field center is a logic value 0.

[0045] In the embodiment, the all-optical logic gate is verified in the above manner, and it can be judged whether the logic function of the all-optical AND gate is normal; the verification methods of the other logic states of the all-optical logic gate are similar to the verification method of the all-optical AND gate.

[0046] The application will be further described in detail in the following examples. It should be understood that the following examples are only used to further illustrate the application, and cannot be understood as a limitation on the protection scope of the application. Some non-essential improvements and adjustments made by those skilled in the art according to the above content of the application are all within the protection scope of the application.

[0047] Example 1 The embodiment utilizes the two-dimensional material purple phosphorus-based all-optical logic gate as shown in Figure 1 The accuracy of the logic gate is verified by the all-optical logic gate based on two-dimensional material purple phosphorus as shown in the following: The first light path adopts 532nm Gaussian continuous light with an initial power of 130mw; the second light path adopts 633nm Gaussian continuous light with an initial power of 100mw. As shown in Figure 2 When the laser is transmitted through the focusing lens and then emitted to the far-field observation screen after being incident on the purple phosphorus unit, the observation far-field light field pattern is a central dark diffraction ring (no bright spot in the center, and the bright and dark contrast of the ring is obvious), corresponding to Figure 2 the left logic "0" state; while the observation far-field light field pattern is a central bright basic Gaussian light or a diffraction ring (central bright, and the bright and dark contrast of the ring is obvious), corresponding to Figure 2 the right logic "1" state.

[0048] Specifically, the first laser emits laser light which is adjusted in light intensity as needed after passing through the first optical attenuator, and then is focused on the first purple phosphorus unit (the concentration of the purple phosphorus nanosheet dispersion liquid is 0.05mg / ml) through the first optical lens, and then is focused on the third purple phosphorus unit (the concentration of the purple phosphorus nanosheet dispersion liquid is 0.20mg / ml) through the second optical lens; the second laser emits laser light which is adjusted in light intensity as needed after passing through the second optical attenuator, and then is focused on the second purple phosphorus unit (the concentration of the purple phosphorus nanosheet dispersion liquid is 0.05mg / ml) through the third optical lens, and then is focused on the third purple phosphorus unit in sequence through the first mirror, the second mirror, the third mirror and the fourth optical lens, wherein it is required to ensure that the light beam one and the light beam two are focused on the third purple phosphorus unit at a small angle and are not collinear. During the light path propagation, the light beam one and the light beam two are subjected to spatial self-phase modulation based on the first purple phosphorus unit and the second purple phosphorus unit respectively, so as to generate "0" and "1" signal; in the third purple phosphorus unit, the phase of the light beam two is regulated by the light beam one based on spatial cross-phase modulation, so as to change the signal output by the light beam two, and finally the output signal is displayed in the optical whiteboard, or the output power is collected by using the optical power meter. The signal receiving aperture of the optical power meter should ensure that there is only the central spot of the output signal light, so that the power changes of the signal "0" and the signal "1" can be correctly and obviously collected.

[0049] The above experimental parameters are used to verify that the control light (the first light path) is the input A, the signal light (the second light path) is the input B, and the output signal light field pattern is the logic result Y. Figure 3The "and" gate function: for the modulation of the "and" gate, the light intensity of the control light source output signal "0" is ensured to be greater than the light intensity of the signal "1", the light intensity of the control light source at this time is recorded, the lens position is adjusted so that the focus of the control light is located behind the focal plane of the signal light (both front and back are defined in the projection direction of the optical path, the optical path first passed is the front, and the optical path passed later is the back), and then the position is finely adjusted. When the total phase shift absolute value is less than π or an even multiple of π, the output signal remains consistent with the initial signal light; if the total phase shift absolute value is greater than or equal to π or an odd multiple of π, the output signal is opposite to the initial signal light.

[0050] As shown in Figure 3 , input A = 1 (control light through the first violet phosphor unit, light field is a center bright circular ring), input B = 1 (signal light through the second violet phosphor unit, light field is a center bright circular ring), the angle between the two beams in the intersection area is adjusted to 3°, and the observation output light field is a center bright circular ring (Y = 1, light field is a center bright circular ring), corresponding to Figure 3 the "1+1=1" result in , input A = 1, input B = 0 (signal light through the second violet phosphor unit, light field is a center dark circular ring), keep the angle at 3°, and the observation output light field is a center dark circular ring (Y = 0, light field is a center bright circular ring), corresponding to Figure 3 the "1+0=0" result in , input A = 0 (control light through the first violet phosphor unit, light field is a center dark circular ring), input B = 1, keep the angle at 3°, and the observation output light field is a center dark circular ring (Y = 0), corresponding to Figure 3 the "0+1=0" result in , input A = 0, input B = 0, keep the angle at 3°, and the observation output light field is a center dark circular ring (Y = 0), corresponding to Figure 3 the "0+0=0" result in . Compare the experimental results with the truth table of the "and" gate, and confirm that there is no error. Test the center intensity of the image, and get the contrast of the center intensity of the "0" and "1" signals, which is 5:1-19:1, which can accurately identify the "1" and "0" signals, indicating that the logic gate has high accuracy.

[0051] In summary, the application provides a two-dimensional material purple phosphorus-based all-optical logic gate and a verification method thereof, an optical computing chip and a system. The two-dimensional material purple phosphorus-based all-optical logic gate comprises: a first light path provided with a first purple phosphorus unit; the first light path is used to generate control light and carry a first logic state; a second light path provided with a second purple phosphorus unit; the second light path is used to generate signal light and carry a second logic state; a signal receiving module provided with a third purple phosphorus unit; the third purple phosphorus unit is located at the intersection area of the first light path and the second light path; wherein the first purple phosphorus unit, the second purple phosphorus unit and the third purple phosphorus unit are all composed of a purple phosphorus nanosheet dispersion liquid. The application utilizes the nonlinear optical characteristics of two-dimensional material purple phosphorus, first makes a basic Gaussian light beam into a diffraction circle based on spatial self-phase modulation, and then makes the purple phosphorus nonlinear refractive index meet the “0” and “1” signal generation by using the change relationship between the purple phosphorus nonlinear refractive index and the light intensity. Then, based on spatial cross-phase modulation, the control light of the first light path controls the phase change of the signal light of the second light path by affecting the wavefront radius of the signal light, realizes the “0” and “1” change of the output light signal, and meets the logic operation of the corresponding logic gate. Wherein, the basic Gaussian light with a bright far-field center or the concentric diffraction circle is defined as the logic state “1”, and the diffraction circle with a dark far-field center is defined as the logic state “0”. In addition, due to the strong saturated absorption response and excellent physical properties of the purple phosphorus nanosheet, the all-optical logic gate realized by the application has the advantages of simple structure, easy manufacturing, low cost and easy integration.

[0052] It should be understood that the application of the application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the application.

Claims

1. An all-optical logic gate based on the two-dimensional material purple phosphorus, characterized in that, include: The first optical path is provided with a first phosphorescent unit; the first optical path is used to generate control light and carry a first logic state. The second optical path is provided with a second phosphorescent unit; the second optical path is used to generate signal light and carry a second logic state. The signal receiving module is equipped with a third purple phosphor unit; the third purple phosphor unit is located in the intersection area of ​​the first optical path and the second optical path; The first purple phosphorus unit, the second purple phosphorus unit, and the third purple phosphorus unit are all composed of a purple phosphorus nanosheet dispersion.

2. The all-optical logic gate based on the two-dimensional material purple phosphorus according to claim 1, characterized in that, The concentrations of the purple phosphorus nanosheet dispersions in the first and second purple phosphorus units are both lower than the concentrations of the purple phosphorus nanosheet dispersions in the third purple phosphorus unit.

3. The all-optical logic gate based on the two-dimensional material purple phosphorus according to claim 1, characterized in that, The concentration of the purple phosphorus nanosheet dispersion is 0.01-0.20 mg / mL; the ratio of the concentration of the purple phosphorus nanosheet dispersion in the first purple phosphorus unit to the concentration of the purple phosphorus nanosheet dispersion in the third purple phosphorus unit is (1:5)-(1:20); the ratio of the concentration of the purple phosphorus nanosheet dispersion in the second purple phosphorus unit to the concentration of the purple phosphorus nanosheet dispersion in the third purple phosphorus unit is (1:5)-(1:20).

4. The all-optical logic gate based on the two-dimensional material purple phosphorus according to claim 1, characterized in that, In the purple phosphorus nanosheet dispersion, the number of purple phosphorus nanosheets is 2-13 layers, the thickness of the purple phosphorus nanosheets is 2.2nm-14.3nm, and the band gap of the purple phosphorus nanosheets is 1.5eV-2.2eV.

5. The all-optical logic gate based on the two-dimensional material purple phosphorus according to claim 1, characterized in that, The first optical path includes a first laser, a first light intensity adjustment component, a first focusing component, and a first purple phosphor unit arranged sequentially along the light propagation direction.

6. The all-optical logic gate based on the two-dimensional material purple phosphorus according to claim 1, characterized in that, The second optical path includes a second laser, a second light intensity adjustment component, a second focusing assembly, a second phosphor unit, and a reflector group arranged sequentially along the light propagation direction.

7. The all-optical logic gate based on the two-dimensional material purple phosphorus according to claim 1, characterized in that, The signal receiving module also includes an aperture and a power meter arranged sequentially along the light propagation direction; the third purple phosphor unit is disposed on the side of the aperture away from the power meter.

8. An optical computing chip, characterized in that, The optical computing chip integrates an all-optical logic gate based on the two-dimensional material purple phosphorus as described in any one of claims 1-7, and is configured to perform Boolean logic operations at the optical level.

9. A data center optical switching system, characterized in that, Includes an all-optical logic gate based on the two-dimensional material purple phosphorus as described in any one of claims 1-7, used for Boolean logic processing of data packet headers in the optical layer.

10. A verification method for all-optical logic gates based on the two-dimensional material purple phosphorus as described in any one of claims 1-7, characterized in that, Including the following steps: Obtain the light field modes of the first and second purple phosphorus units; If the light field mode of the first phosphor unit is logic value 1 and the light field mode of the second phosphor unit is logic value 1, determine whether the light field mode of the signal receiving module is logic value 1. If so, the logic function of the all-optical AND gate is normal. If the optical field mode of the first phosphor unit is logic value 1 and the optical field mode of the second phosphor unit is logic value 0, determine whether the optical field mode of the signal receiving module is logic value 0. If so, the logic function of the all-optical AND gate is normal. If the light field mode of the first phosphor unit is logic value 0 and the light field mode of the second phosphor unit is logic value 1, determine whether the light field mode of the signal receiving module is logic value 0. If so, the logic function of the all-optical AND gate is normal. If the optical field mode of the first phosphor unit is logic value 0 and the optical field mode of the second phosphor unit is logic value 0, determine whether the optical field mode of the signal receiving module is logic value 0. If so, the logic function of the all-optical AND gate is normal. The logic value is defined as follows: a basic Gaussian light or concentric diffraction ring with a bright far-field center is a logic value of 1, and a diffraction ring with a dark far-field center is a logic value of 0.

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