Electro-optical controllable logic gate micro-nano device of coupling resonant ring based on surface plasmon
By designing a coupled resonant ring electro-optical adjustable logic gate micro-nano device based on surface plasmons, the complex structure of all-optical logic gate devices and the problem of manipulation at the nanoscale of traditional optoelectronic devices is solved, and the rapid and efficient conversion of logic gate functions and the improvement of signal processing is achieved.
Patent Information
- Application Number
- CN202510206644.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-07-18
AI Technical Summary
Existing all-optical logic gate devices are complex in structural changes and difficult to achieve efficient integration. Traditional optoelectronic devices are difficult to accurately manipulate photons at the nanoscale, and there are heating and velocity bottlenecks.
An electro-optical adjustable logic gate micro-nano device based on a coupling resonant ring of a surface plasmon is designed, and a Drude silver substrate, a resonant ring-MIM waveguide structure and a voltage-controlled optical path coupling structure are used to switch the logic gate function by controlling the optical path and voltage signal.
It realizes fast and efficient conversion of logic gate functions, reduces signal transmission losses, improves signal processing speed and accuracy, has good universality and simple structure, and is convenient for integrated design.
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Figure CN120335215A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of metal micro-nano optical devices, and in particular to an electro-optically tunable logic gate micro-nano device based on a surface plasmon coupled resonator in the technical fields of devices that utilize the electro-optic effect to achieve logic operation functions and related technologies for optical signal processing. Background Art
[0002] In this day and age, modern information technology has shown an extremely rapid explosive growth trend, and people's pursuit of high-speed data transmission and processing capabilities has become increasingly urgent and intense. Optical logic gates, as the most core and crucial basic component in the field of optical signal processing technology, play a central hub role in a series of crucial fields such as optical switching systems, high-speed optical packet switching, all-optical address recognition, data encoding, parity check, signal regeneration, optical computing, and future all-optical signal processing for high-speed and large-capacity applications. Naturally, they have become the focus of current scientific research.
[0003] With the continuous and steady advancement and development of technology, the evolution of optical devices towards miniaturization and high integration has become an inevitable trend in the development of the entire industry. However, in the process of its own development, traditional optoelectronic devices have encountered a very difficult and huge obstacle - the phenomenon of light diffraction. In this situation, electro-optical logic gates came into being. They successfully built a key "bridge" for communication between electrical signals and optical signals, and have the remarkable advantages of integrating logic operations and signal modulation. Their structure is relatively simple and clear, their performance is stable and reliable, and they can also optimize signals. Against the backdrop of the rapid iteration and update of information technology, as the core key unit of optical signal processing technology, optical logic gates are the key core devices for the effective operation of optical switching systems, and also the key decisive factors determining the performance of the entire network. They play an irreplaceable and important role in many different fields. When the size of traditional optoelectronic devices is reduced to less than the optical wavelength, light is difficult to be effectively confined within the internal space of the device, resulting in many difficulties in precisely controlling photons. Just in such a difficult situation, the unique properties of surface plasmons have been discovered and exploited. As an electron density wave existing at the metal-dielectric interface, surface plasmons have the extraordinary ability to confine the optical field extremely tightly within a tiny space of only dozens of nanometers, successfully breaking through the traditional diffraction limit, and also having a very strong and significant local field enhancement special property. Compared with traditional optoelectronic devices with a scale in the hundreds of nanometer range, surface plasmons effectively break the shackles formed by the light diffraction limit on the further development of optical integrated devices, opening up a new path for optical information transmission and processing in the nanoscale range, and having an irreplaceable key important influence in the future field of in-depth research on highly integrated photonic devices. Based on such a major breakthrough, in recent years, the research work on all-optical logic gates based on surface plasmons has shown a booming prosperity, mainly including various types such as optical logic gates based on surface plasmon polaritons (SPPs), optical logic gates based on local surface plasmons (LSPs), and all-optical logic gates that can achieve dynamic regulation functions. However, it is regrettable that most of these all-optical logic gates often need to rely on adding or reducing structural changes to achieve the switching between different logic gate functions. Such an implementation method is relatively complex and cumbersome, has many disadvantages for the overall integrated design, and its performance in terms of universality is also unsatisfactory. Summary of the Invention
[0004] The purpose of the present invention is to provide an electro-optically controllable logic gate micro-nano device based on a coupled resonant ring of a surface plasmon, aiming to solve the existing technical problems of overcoming the heating and speed bottlenecks of traditional electronic integrated circuits, further improving the performance of optical logic gates in photonic integrated circuits, reducing signal transmission losses, and improving signal processing speed and accuracy.
[0005] To achieve the above-mentioned purpose, the present invention provides an electro-optically controllable logic gate micro-nano device based on a coupled resonant ring of a surface plasmon, comprising: a silver substrate as an SPP excitation, a resonant ring-MIM waveguide structure for optical path transmission coupling arranged on the substrate, coupled transmission controlled by a control waveguide, an optical path coupling structure regulated by a voltage signal, and two light source input ports arranged in the waveguide structure and an output port after signal coupling arranged at the other end of the structure. The nanocomposite structure, the resonant ring-MIM waveguide structure, the voltage regulation coupling structure and the metal silver substrate are placed at the same level. When the light source is coupled in the resonant ring, the voltage signal is changed to change the optical path transmission distance, and the coupled signal is then output through the waveguide 3. The transmission of different optical signals realizes the coupling of the structure because of the change in the optical path, so that the signal is transmitted through regulation, and the switching of the transmission of different optical logic gate signals is realized. Waveguide structure of resonant ring coupling control and voltage regulation.
[0006] Furthermore, the resonant ring coupling control and voltage-regulated waveguide structure is formed by slits deposited by etching of the corresponding silicon dioxide material.
[0007] Furthermore, in the waveguide structure for coupling control of the resonant ring and voltage regulation, the slit widths of the resonant ring and the rectangular waveguide are equal in the horizontal plane.
[0008] Furthermore, the width of the resonant ring is 50 nm, and the width of the rectangular waveguide in the horizontal direction is 50 nm.
[0009] Furthermore, the control waveguide is consistent with the input waveguide and is used to transmit optical signals to facilitate coupling with other optical signal transmissions.
[0010] Furthermore, the average radius of the resonance ring in the horizontal direction is 230 nm, the maximum outer radius of the resonance ring is 255 nm, and the minimum inner radius is designed to be 205 nm.
[0011] Furthermore, the annular resonant ring and the output rectangular waveguide structure are placed horizontally, and the two structures are on the same horizontal symmetry axis to achieve effective and efficient transmission of optical signals.
[0012] Furthermore, for the optical path coupling structure regulated by the voltage signal, the organic electro-optic material 4-(4-dimethylaminostyryl)-N-methylpyridinium p-toluenesulfonate (DAST) is used.
[0013] Furthermore, for the optical path coupling structure regulated by the voltage signal, the regulation structure is symmetrically placed on both sides of the circular resonator ring.
[0014] Furthermore, for the optical path coupling structure regulated by the voltage signal, electrodes are added on both sides of the material. By applying an external voltage, a linear change in the refractive index of the material is caused.
[0015] Furthermore, the input of the light source signal is the forward input of port1 and port2. When a single beam of optical signal is input at the two ports respectively, its signal is transmitted through the output end, and the transmission efficiency is the same; then, when input simultaneously through the two ports, the signal transmission undergoes coherent regulation by the control waveguide structure, and the signal transmission rate is enhanced, realizing the "NOR" gate logic operation of this structure.
[0016] When two beams of optical signals are input, the phase of the signals is changed so that the phase difference is a certain value, and the phase difference from the control waveguide signal is a certain value. After the signals are coupled, the two beams of optical signals interfere with each other, realizing the "NOT" gate logic operation.
[0017] During the signal transmission process, through the voltage regulation structure, the optical path transmission is changed to achieve a cancellation mode between the two beams of optical signals, and the signal transmission rate at the output end is significantly reduced, realizing the "XNOR" gate logic operation of this structure.
[0018] The present invention relates to an electro-optically tunable logic gate micro-nano device based on a surface plasmon-coupled resonator ring, belonging to the technical fields of metal micro-nano optical devices and integrated circuit all-optical networks. Its structure includes parts such as a Drude silver substrate, a resonator ring-MIM waveguide combined structure, and an optical path coupling structure, and the control waveguide structure plays a role in guiding and regulating the transmission and coupling of optical signals.
[0019] By adopting the finite-difference time-domain (FDTD) method and utilizing the property of surface plasmon to break through the diffraction limit, the design, operation, and integration of all-optical logic gates can be carried out at the nanoscale. In actual operation, by adjusting the voltage to change the coupling mode of the transmission waveguide, the transmission optical path can be regulated to realize various logic gate functions such as NOT gate, NOR gate, XNOR gate, etc., and different logic functions can be quickly and efficiently switched on the same structure. Compared with the existing technologies, by means of the symmetry structure design, it has the advantages of good universality, simple structure and easy integration. Complex logic gates can be realized by cascading basic logic units. Moreover, this invention has broad application prospects in the fields of optical signal processing, ultra-compact photonic integrated devices, and sensing technology. It can overcome the problems of optical signal processing, contribute to the miniaturization and multifunctionalization of photonic integrated devices, improve the optical computing ability, and endow the integrated optical regulation ability, adding vitality and impetus to the development of related fields. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0021] Figure 1 FIG. is a schematic structural diagram of an electro-optically tunable logic gate micro-nano device based on a surface plasmon-coupled resonator of the present invention.
[0022] Figure 2 FIG. is a schematic diagram of the signal transmission coupling structure of an electro-optically tunable logic gate micro-nano device based on a surface plasmon-coupled resonator of the present invention.
[0023] Figure 3 FIG. is a schematic diagram of the planar size structure of an electro-optically tunable logic gate micro-nano device based on a surface plasmon-coupled resonator of the present invention.
[0024] Figure 4 FIG. is a schematic diagram of the effective medium refractive index and size of an electro-optically tunable logic gate micro-nano device based on a surface plasmon-coupled resonator of the present invention.
[0025] 1, 2 - signal transmission input waveguides, control waveguide for optical signal regulation, 3 - signal coupling output waveguide, 4 - micro-ring resonator structure, 5 - electro-control coupling structure, 6 - drude silver dielectric substrate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] To make the objectives, technical solutions and advantages of this application more clear and understandable, the embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.
[0027] Please refer to Figures 1 to 3 , the present invention proposes an electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon polaritons, including parts such as a Drude silver substrate, a resonator ring-MIM waveguide combined structure, and an optical path coupling structure. The control waveguide structure plays a role in guiding and regulating the transmission and coupling of optical signals. By using the finite-difference time-domain method (FDTD) and the characteristic of surface plasmon polaritons breaking through the diffraction limit, the design, operation, and integration of all-optical logic gates can be carried out at the nanoscale. During actual operation, by adjusting the voltage to change the coupling mode of the transmission waveguide, the transmission optical path can be regulated to achieve various logic gate functions such as NOT gate, NOR gate, XNOR gate, etc., and different logic functions can be quickly and efficiently switched on the same structure.
[0028] More specifically, in one embodiment, the waveguide structure of the resonator ring-MIM waveguide is formed by a slit etched and deposited from the silica material belonging to it.
[0029] More specifically, in one embodiment, the slit widths of the resonator ring and the rectangular waveguide in the waveguide of the resonator ring-MIM waveguide structure are equal in the horizontal plane.
[0030] More specifically, in one embodiment, the control waveguide in the waveguide of the resonator ring-MIM waveguide structure is the same as the input waveguide. It is used to transmit optical signals and promote coupling with the transmission of other optical signals.
[0031] More specifically, in one embodiment, the width of the resonator ring is 50 nm, and the width of the rectangular waveguide in the horizontal direction is 50 nm.
[0032] More specifically, in one embodiment, the average size radius of the resonator ring in the horizontal direction is 230 nm, the maximum outer radius of the resonator ring is 255 nm, and the minimum inner radius is designed to be 205 nm.
[0033] More specifically, in one embodiment, the structures of the annular resonator ring and the output rectangular waveguide are horizontally placed, and the two structures are on the same horizontal symmetry axis to achieve effective and efficient transmission of optical signals.
[0034] More specifically, in one embodiment, two optical signal input rectangular MIM waveguides are symmetrically arranged with respect to the resonant ring. The optical path coupling structure regulated by a voltage signal uses the organic electro-optic material 4-(4-dimethylaminostyryl)methylpyridinium p-toluenesulfonate (DAST).
[0035] More specifically, in one embodiment, the optical path coupling structure regulated by a voltage signal is symmetrically placed on both sides of the circular resonant ring.
[0036] More specifically, in one embodiment, for the optical path coupling structure regulated by a voltage signal, electrodes are added on both sides of the material. By applying an external voltage, a linear change in the refractive index of the material is caused
[0037] More specifically, in one embodiment, the light source signals are input forwardly at port1 and port2. When a single optical signal is input at each of the two ports respectively, its signal is transmitted through the output end, and the transmission efficiencies are the same; then when input simultaneously through the two ports, the signal transmission undergoes coherent regulation by the control waveguide structure, and the signal transmission rate is enhanced, realizing the "NOR" gate logic operation of this structure.
[0038] When two optical signals are input, the phase of the signals is changed so that the phase difference is a certain value, and the phase difference from the control waveguide signal is a certain value. After the signals are coupled, the two optical signals interfere with each other, realizing the "NOT" gate logic operation.
[0039] During the signal transmission process, through the voltage regulation structure, the optical path transmission is changed to achieve a cancellation mode between the two optical signals, and the signal transmission rate at the output end is significantly reduced, realizing the "XNOR" gate logic operation of this structure.
[0040] The present invention also provides a specific embodiment and simulation experiment for illustration:
[0041] As a specific example, the present invention is further described in combination with Figure 1 , an electro-optically tunable logic gate micro-nano device based on a surface plasmon-coupled resonant ring, includes a Drude silver substrate, a resonant ring-MIM waveguide combined structure, and the control waveguide structure plays a role in guiding and regulating the optical signal transmission and coupling. And an optical path coupling structure arranged in the MIM waveguide structure to control the optical signal coupling and transmission through a voltage signal; the incident light source is a TM-polarized plane wave, and the presence or absence of two incident light sources realizes four states of the signal: (00), (01), (10), (11). When the optical signal is at 1550 nm, the signal transmission rates achieved by voltage regulation are 0.21, 0.05, 0.5, and 0.34, realizing the corresponding output states of 1, 0, 0, and 1, thus realizing the "XNOR" gate logic operation.
[0042] In the above manner, the phase difference between the voltage and the signal light source is changed, thereby causing the signal transmission optical path to change, generating different coupling modes, and resulting in a change in the signal transmission efficiency. The "NOT" gate logic operation of this structure and the "NOR" gate logic operation are realized.
[0043] The above-disclosed is only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.
Claims
1. An electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon polaritons, characterized in that it includes: one is a silver substrate for exciting surface plasmon polaritons (SPPs), which provides the basic support for the operation of the entire device; the second is a resonator ring-MIM waveguide structure placed on the substrate, which undertakes the important functions of optical path transmission and coupling, and the optical signal can be effectively transmitted and coupled in this structure; the third is a coupled transmission part controlled by the control waveguide, which can accurately control the coupled transmission process of the optical signal; the fourth is an optical path coupling structure that can be regulated by a voltage signal, and this structure is the core link to realize the flexible regulation of the optical signal; in addition, there are two light source input ports located in the waveguide structure, which are the entrances for the optical signal to enter the device, and an output port located at the other end of the structure for outputting the result after signal coupling. Among them, the nano-composite structure, the resonator ring-MIM waveguide structure, the voltage-regulated coupling structure, and the metal silver substrate are all at the same horizontal height, and this layout is conducive to the stable transmission and effective interaction of optical signals between the structures. When the light source is coupled and transmitted in the resonator ring, by changing the voltage signal, the optical path transmission distance can be accurately adjusted. Since the optical path changes, the coupling state between the structures changes accordingly, so that after the optical signal is regulated and transmitted, the switching of different optical logic gate signal transmissions can be achieved, and the flexible conversion and precise control of various logic functions can be realized.
2. The electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon as claimed in claim 1, wherein The waveguide structure of the resonator ring-MIM waveguide is formed by etching and depositing a slit of the silica material.
3. The electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon as claimed in claim 2, wherein, The slit widths of the resonator ring and the rectangular waveguide in the waveguide of the resonator ring-MIM waveguide structure are equal on the horizontal plane.
4. An electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmons as claimed in claims 2 and 3, It is characterized in that the control waveguide is the same as the input waveguide. For transmitting optical signals and promoting coupling with other optical signal transmissions.
5. An electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmons according to claim 2 and claim 3, characterized in that, The width of the resonator ring is 50 nm, and the width of the rectangular waveguide in the horizontal direction is 50 nm.
6. An electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmons according to claim 2, 3, or 4, characterized in that, The average size radius of the resonator ring in the horizontal direction is 230 nm, the maximum outer radius of the resonator ring is 255 nm, and the minimum inner radius is designed to be 205 nm.
7. An electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon as described in claims 1 to 5, characterized in that, The structures of the annular resonator ring and the output rectangular waveguide are placed horizontally, and the two structures are on the same horizontal symmetry axis to achieve the effective and efficient transmission of optical signals.
8. An electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon as claimed in claims 1 to 7, characterized in that, The two optical signal input rectangular MIM waveguides are symmetrically arranged with respect to the resonator ring.
9. The electro-optically tunable logic gate micro-nano device based on a coupled resonator ring of surface plasmon as claimed in claim 1, wherein, The optical path coupling structure regulated by the voltage signal uses the organic electro-optic material 4-(4-dimethylaminostyryl)methylpyridinium p-toluenesulfonate (DAST). The optical path coupling structure regulated by the voltage signal is symmetrically placed on both sides of the circular resonator ring.
10. The electro-optically tunable logic gate micro-nano device based on surface plasmon-coupled resonator rings as claimed in claims 8 and 9, characterized in that, An optical path coupling structure regulated by voltage signals, with electrodes added on both sides of the material. The light source signals are input in the forward direction at port1 and port2. When a single beam of optical signal is input at the two ports respectively, its signal is transmitted through the output end, and the transmission efficiency is the same; then, when input simultaneously through the two ports, the signal transmission undergoes coherent regulation by the control waveguide structure, and the signal transmission rate is enhanced, realizing the "NOR" gate logic operation of this structure. When two beams of optical signals are input, the phase of the signals is changed so that the phase difference from the control waveguide signal is a certain value. After the signals are coupled, the two beams of optical signals interfere with each other, realizing the "NOT" gate logic operation. During the signal transmission process, the control signal is continuously transmitted to control the signal coupling mode. Through the voltage regulation structure, the optical path transmission is changed to achieve the cancellation mode between the two beams of optical signals, and the signal transmission rate at the output end is significantly reduced, realizing the "XNOR" gate logic operation of this structure.