29 results about "Slow light" patented technology

The utility model relates to a slow light device based on a rectangular discontinuous graphene metamaterial. The slow light device comprises a silicon substrate, square ring continuous graphene, first rectangular discontinuous graphene, second rectangular discontinuous graphene and third rectangular discontinuous graphene. The square ring continuous graphene, the first rectangular discontinuous graphene, the second rectangular discontinuous graphene and the third rectangular discontinuous graphene are respectively arranged on the upper surface of the silicon substrate; the first rectangular discontinuous graphene, the second rectangular discontinuous graphene and the third rectangular discontinuous graphene are sequentially and uniformly arranged along the front-back direction of the slow light device; the square ring continuous graphene is of a rectangular frame structure. According to the utility model, the problems of small refractive index and narrow bandwidth of a slow light device group with a graphene metamaterial structure are solved; the size of the slow light device with the graphene metamaterial structure is reduced, and the problem that the slow light device with the graphene metamaterial structure is not easy to integrate in an on-chip plasmon light path is solved.

The invention relates to an intermediate infrared micro comb generation system and method, in particular to an intermediate infrared micro comb key starting type generation system and method based on a negative thermo-optic effect. In order to solve the problems that a traditional mid-infrared light frequency comb is limited in size, weight, power consumption and repetition frequency, and the mid-infrared band faces the defects that the light source tuning rate is low, the micro-cavity quality factor is low and the key device performance is poor, the invention provides the mid-infrared light frequency comb. The intermediate infrared micro comb key starting type generation system based on the negative thermo-optic effect comprises a pumping unit used for providing pumping light, a microcavity unit used for generating a nonlinear four-wave mixing process and the negative thermo-optic effect, and a detection unit used for receiving an intermediate infrared micro comb and recording time domain information and frequency domain information of the intermediate infrared micro comb. Meanwhile, the invention provides a key-starting type generation method of the mid-infrared micro comb based on the negative thermo-optical effect, which is self-starting, wide in spectral bandwidth, high in repetition frequency and high in stability based on the system.

The utility model relates to a slow light device based on coupling of a graphene nano-strip waveguide and four rectangular cavities. The slow light device comprises a silicon substrate, a sapphire layer, the graphene nano-strip waveguide, a first graphene rectangular resonant cavity, a second graphene rectangular resonant cavity, a third graphene rectangular resonant cavity and a fourth graphene rectangular resonant cavity. The sapphire layer is arranged above the silicon substrate; the upper surface of the sapphire layer is provided with a graphene nanometer strip waveguide, a first graphene rectangular resonant cavity, a second graphene rectangular resonant cavity, a third graphene rectangular resonant cavity and a fourth graphene rectangular resonant cavity. According to the utility model, an infrared graphene structure slow light device with large group refractive index and wide bandwidth is realized, an ultra-compact graphene slow light device is realized, and the size of the graphene structure slow light device is greatly reduced.

The three-dimensional photon antiferromagnetic topological insulator is constructed based on a net zero magnetization three-dimensional gyromagnetic photonic crystal, and primitive cells of the three-dimensional photon antiferromagnetic topological insulator in a Z-axis periodic array are composed of a metal coupling plate, an A-layer photonic crystal, a metal coupling plate and a B-layer photonic crystal which are arranged in a laminated mode; the projections of the gyromagnetic medium columns in the photonic crystals of the A layer and the B layer on an X-Y plane meet a Bercal stacking relationship; the metal coupling plate is provided with a coupling hole and a mounting hole for embedding the permanent magnet; the gyromagnetic dielectric cylinders are clamped between the permanent magnets at the corresponding positions in the adjacent metal coupling plates; the magnetic bias directions provided by the permanent magnets for the adjacent gyromagnetic medium columns clamped by the permanent magnets are opposite. The antiferromagnetic topological insulator constructed by the invention has a complete bulk band gap and adjustable crystal face Dirac mass, and can cooperatively excite a one-dimensional chiral prism state and a two-dimensional chiral surface state. Furthermore, the topological slow light waveguide device with nonreciprocity, robustness and broadband slow light transmission characteristics is designed and realized by utilizing the insulator.

The application belongs to the field of metamaterial structure, and particularly relates to a tunable induced transparent terahertz device, which comprises a bias voltage and a silicon substrate layer, a graphene layer and a silicon cover layer arranged in sequence, one electrode of the bias voltage is connected with the graphene layer, and the other electrode is connected with the silicon cover layer, the graphene layer is formed by combination of multiple graphene units, the multiple graphene units are arranged periodically, the graphene unit comprises a first graphene strip and a second graphene strip perpendicular to each other, and two graphene blocks symmetrically arranged on both sides of the second graphene strip, the first graphene strips of graphene units in the same column are collinear and connected, the application can realize very obvious double-plasmon induced transparent phenomenon by eliminating the interference of bright mode and dark mode in the terahertz region, the desired slow light effect can be obtained by adjusting the external voltage, and in addition, the device also has the advantages of small size, thin thickness, easy integration and manufacturing and the like.

The present invention discloses a tunable electromagnetically induced transparent metamaterial and its tuning method and application, which belong to the field of terahertz metamaterial technology. The tunable electromagnetically induced transparent (EIT) metamaterial is arranged in order from top to bottom: a vanadium dioxide film, a dielectric layer, a grating layer and a reflective layer. The EIT-like effect is generated by the guided mode resonant coupling between the grating and the dielectric layer, avoiding the complex structure of the metasurface used in the past. The metamaterial achieves flexible adjustment of the EIT-like peak (63%-98%) and the slow light effect in the EIT-like window (group delay 1.87ps-2.86ps) by externally stimulating the change in the conductivity of vanadium dioxide (45000S / m-200S / m). It has the advantages of simple structure, easy processing, and easy operation of the tuning method.

The application discloses a high-Briouin gain inverted ridge type chalcogenide waveguide with an air slit and a preparation method thereof. The chalcogenide waveguide comprises a substrate layer and a waveguide layer arranged on the substrate layer. The lower surface of the waveguide layer is outwardly convex to form a ridge type part. The ridge type part of the waveguide layer is embedded in the substrate layer to form an inverted ridge type waveguide structure. The inside of the ridge type part of the waveguide layer is provided with an air slit. The application limits the distribution areas of an optical field and an acoustic field through the inverted ridge type waveguide structure, enhances the acoustic-optical field overlap, simultaneously introduces an air slit structure, causes the appearance of optical radiation force, and makes the optical radiation force strongly coupled with the acoustic field near the air slit, enhances the coupling effect of the optical force and the acoustic field in the waveguide, and thus significantly improves the stimulated Briouin scattering gain. The waveguide structure can be applied to a laser, a microwave photon filter, slow light generation and other nonlinear optical devices.

This invention discloses a method for controlling multiple transparent windows based on a coupled-cavity opto-magnetic-mechanical system, comprising the following steps: Step 1: Building a physical model of the coupled-cavity opto-magnetic-mechanical system, including a YIG crystal with a microbridge structure, a microwave cavity, and coupled dual optical cavities; Step 2: The coupled optical cavity and microwave cavity are driven by a strong red detuned optical field and a microwave field, respectively; Step 3: Introducing two weak detection fields at two frequencies to detect the output responses of the two cavity modes; Step 4: Solving for the output spectra of the microwave cavity and optical cavity using the Langevin equations of motion; Step 5: Changing the system coupling parameters to achieve the fabrication of multiple transparent windows, fast and slow light, and Fano resonance phenomena. This invention solves the technical challenge of multiple transparent window coexistence by implementing multiple coupling mechanisms in one system, and utilizes multi-band transparent windows to achieve discrete signal processing, supporting multi-band quantum storage and multi-channel photonic information processing, thereby improving the efficiency and capacity of quantum information processing.

The invention relates to the technical field of terahertz frequency screening devices, and particularly discloses a transmission type terahertz narrow-band filter device based on a continuous domain bound state, which comprises a BF33 glass substrate and a monocrystalline silicon structure with a digging hole in an isosceles triangle shape and a digging hole depth of 90 microns. Based on the continuous domain bound state and the electromagnetic induction transparency theory, the determined geometric parameters meet the requirements of the designed narrow-band filtering function of the specific frequency of the terahertz frequency band, the targets of high transmittance, ultra-narrow bandwidth and ultrahigh Q value under the specific frequency are achieved, and the method can be well suitable for application of the terahertz wave band. The transmission-type terahertz narrow-band filter device based on the continuous domain bound state provided by the invention has extremely strong filtering and phase delay functions on terahertz waves, and provides a new way for realizing narrow-band filtering and slow light effect of a specific terahertz frequency; the method has important significance in the fields of terahertz narrow-band filtering, molecular sensing, slow light effect and the like.

The application provides a low-noise speckle interferometry system and method based on a spatial light modulator, relates to the technical field of speckle interferometry, and comprises a laser, a light splitting prism one and an imaging element; a laser beam emitted by the laser is split into transmitted light and reflected light by the light splitting prism one; part of the transmitted light is reflected by a light splitting prism three and then irradiated on the imaging element as reference light; part of the reflected light sequentially passes through a linear polarizer and a half-wave plate, is modulated by a spatial light modulator assembly, is irradiated on a light splitting prism four, is reflected to a measured object surface to occur diffuse reflection, and slow light is obtained; the speckle interferometry system modulates object light by using the spatial light modulator assembly, makes the emitted light modulated by the spatial light modulator assembly irradiate the measured object at multiple illumination angles, forms independent speckle fields on a target surface of the imaging element, and can effectively suppress speckle de-correlation noise after multiple measurement superposition, and then the accuracy of subsequent measurement results is improved.

The present disclosure relates to a device (100) for determining an orientation of a moving object (300) The device (100) comprises a slow light beam source and a plurality of light detectors (220) provided on a housing (120). The slow light beam source is configured to provide a beam of slow light (180) having a reduced propagation speed relative to the vacuum. The plurality of light detectors (220) is configured to generate signals in response to detecting the beam of slow light (180) incident on the plurality of light detectors (220). The device (100) further comprises a control unit (240) communicatively coupled to the plurality of light detectors (220) and receives the signals from the plurality of light detectors (220). The control unit (240) is configured to determine the orientation of the moving object (300) based on the signals received from the plurality of detectors (220).

The invention discloses a multiband tunable electromagnetic induction-like transparent metamaterial and application, and belongs to the technical field of electromagnetic induction transparent metamaterials. The multiband tunable electromagnetic induction-like transparent metamaterial comprises a plurality of periodically arranged structural units, each structural unit comprises a substrate, a graphene metasurface is arranged on the upper surface of each substrate, and each graphene metasurface comprises a rectangular resonator, a first split-ring resonator and a second split-ring resonator. The second split-ring resonator is located between the first split-ring resonator and the rectangular resonator, and the bottom of the second split-ring resonator is nested in the first split-ring resonator; the rectangular resonator, the first opening resonance ring and the second opening resonance ring generate three similar electromagnetic induction transparent windows in the terahertz wave band through the near-field coupling effect. According to the multiband tunable electromagnetic induction-like transparent metamaterial and the application, three high-transmittance transparent windows are generated in a terahertz wave band, a remarkable slow light effect is achieved, and the transmission amplitude, the center frequency and the slow light effect of the transparent windows are adjusted by adjusting the Fermi level of graphene.

Embodiments of the present disclosure relate to MEMS mirror systems with slow light beam deflection. A light beam deflection system is configured to transmit a light beam with a time-varying output deflection angle. The system includes a first resonant structure configured to oscillate about a first rotational axis with a first resonant frequency, a second resonant structure configured to oscillate about a second rotational axis with a second resonant frequency, wherein the first rotational axis is parallel to the second rotational axis, and the first resonant frequency and the second resonant frequency are different and define a predetermined frequency difference, and a drive circuit configured to generate a first drive signal to drive the first resonant structure while additionally generating a second drive signal to drive the second resonant structure, such that the output deflection angle of the light beam oscillates according to a beat pattern of a beat wave, extreme values of the beat wave being modulated and defined by a periodic envelope.

An optical element for light field regulation and control, a preparation method and an imaging intervention device.The optical element comprises a lens base body, the lens base body has a radial direction and a thickness direction perpendicular to the radial direction, and a central vision area and a slow light regulation and control area are formed on the lens base body; the central vision area is formed in the middle of the lens base body, the slow light regulation and control area is arranged outside the central vision area in a surrounding mode and comprises a plurality of photonic crystals, the photonic crystals are arranged in an array mode and arranged on the lens base body, and the slow light regulation and control area is arranged between the central vision area and the slow light regulation and control area. The slow light regulation region is configured to reduce a group velocity of light passing through the slow light regulation region. The optical element can well regulate and control myopia.

The present invention provides a temperature-refractive-index dual-parameter sensor for a one-dimensional photonic crystal racetrack microring. The sensor comprises a bus waveguide and a one-dimensional photonic crystal racetrack microring. The bus waveguide is linearly arranged on one side of the one-dimensional photonic crystal racetrack microring and is coupled to the one-dimensional photonic crystal racetrack microring. The one-dimensional photonic crystal racetrack microring comprises a racetrack structure, and a photonic bandgap is formed between the racetrack structure and the bus waveguide. The sensor utilizes the slow light effect to generate resonance peaks with different free spectral ranges at the edge of the photonic bandgap of the one-dimensional photonic crystal racetrack microring. Because the effects of temperature and the effect of the substance being measured on the effective refractive index are reflected on different resonance peaks, the temperature and refractive index information of the substance being measured can be calculated by recording the relative changes in the positions of these resonance peaks, thereby improving detection efficiency and accuracy.

The invention relates to the technical field of integrated optoelectronic devices, in particular to a silicon-organic polymer mixed slow light waveguide electro-optical modulator which comprises a silicon input and output waveguide, a grating type slow light silicon waveguide, a multi-mode interference waveguide, an organic electro-optical polymer cladding, a T-shaped metal modulation electrode and a silicon dioxide upper and lower cladding. The optical wave group speed is reduced through the grating type slow optical waveguide design, the photoelectric signal interaction is enhanced, and efficient modulation is achieved by combining the organic polymer with the high electro-optical coefficient. According to the invention, the modulation efficiency and bandwidth can be remarkably improved, the device size and power consumption are reduced, and the scene requirements of high-speed data center interconnection, high-performance calculation and the like are met.

The utility model relates to a kind of slow light devices based on cross and triangular graphene metamaterial structure, including silicon substrate and be located on the upper surface of silicon substrate cross cruciform graphene, first right triangle graphene, second right triangle graphene, third right triangle graphene, fourth right triangle graphene;Cross cruciform graphene is composed of horizontal graphene and vertical graphene by being mutually perpendicular;Cross cruciform graphene is set at the center of silicon substrate;First right triangle graphene, second right triangle graphene, third right triangle graphene, fourth right triangle graphene are respectively symmetrically set in the left front, right front, right rear and left rear of cross cruciform graphene.The utility model utilizes the SPPs generated by graphene has strong local light field enhancement characteristics, and the steep dispersion characteristics of PIT effect has, realizes a kind of micron order super-compact and large group refractive index graphene metamaterial structure slow light device.

The application relates to a graphene 2-bit metasurface coding structure and a coding method, and belongs to the technical field of tunable metamaterials. The metasurface coding structure is composed of a substrate layer and a graphene layer unit structure array arranged in sequence, wherein the graphene layer is arranged on the upper surface of the substrate layer; the application is suitable for the field of terahertz communication and has important application value in the direction of encoders, multi-frequency switches and slow light devices.

The present application relates to a kind of photonic crystal-based oxygen sensing film and its preparation method, the oxygen sensing film includes: by the photonic crystal substrate formed by the self-assembly of periodically arranged microspheres, the oxygen-sensitive probe layer of phosphorescent metalloporphyrin compound attached to the photonic crystal substrate;The photonic crystal substrate has the photonic band gap matched with the emission peak wavelength of oxygen-sensitive probe.The oxygen sensing film in the present application is synergized by the Purcell effect of the band edge of photonic crystal and the slow light enhancement effect, realizes the high sensitivity, fast response and good selectivity of oxygen detection, and preparation process is environmentally friendly controllable.

A surface-emitting lasing device includes a substrate and an array of parallel nano-ridge devices grown epitaxially on the substrate. The nano-ridge devices are configured for together form a laser cavity that supports a slow light band-edge lasing mode for lasing across the array of nano-ridges and to couple the laser mode out from the substrate surface to enable surface emission.

This invention proposes a valley-slow optical waveguide state based on a triangular lattice valley photonic crystal to address the technical problems of weak magneto-optical effect in the optical band and the need for an external strong bias magnetic field in valley-slow optical waveguide states constructed with magneto-optical photonic crystals, as well as the complex fabrication and narrow bandwidth of valley-slow optical waveguide states constructed with honeycomb topological valley photonic crystals. This invention includes a triangular lattice valley photonic crystal with a valley count of 1 and a triangular lattice valley photonic crystal with a valley count of -1. The region formed by the triangular lattice valley photonic crystal with a valley count of 1 is the first region, and the region formed by the triangular lattice valley photonic crystal with a valley count of -1 is the second region. A mustache-shaped interface is formed at the junction of the first and second regions, and a light source is located on the mustache-shaped interface. This invention has advantages such as simpler construction, lower R&D cost, high refractive index, and zero group velocity dispersion, greatly improving the time and intensity of light-matter interaction in waveguide photonic devices, and can be used in integrated photonic devices.

The invention discloses an electric tuning terahertz filter based on integration of a single split ring resonator and graphene, which is characterized in that the Fermi level of the graphene is adjusted from 0 to 1.5 eV, the gap capacitance of the SRR can be continuously adjusted and controlled, and the reversible blue shift (delta f is approximately equal to 1.30 THz, and the tuning range reaches 109%) of LC resonance from 1.19 THz to 2.50 THz is realized. According to full-wave simulation prediction, the modulation depth exceeds 98% in the unbiased state, exceeds 94% in the whole tuning range and is kept at 95% or above at the low voltage end and the high voltage end. The resonance quality factor Q drops from about 20.6 at 0 eV to a critical damping state (Qlt; 1.5, the occurrence between 0.05-0.4 eV), and about 48 when it recovers to 1.5 eV. Group delay measurement shows that the dispersion characteristic can be controlled through grid voltage programming, so that slow light operation (slow light delay is about 0.35 ps) and low delay response are supported. The method is suitable for a 6G transceiver, a hyper-spectral imaging system and a self-adaptive sensing platform with high frequency spectrum agility.

The utility model provides a gradual change type lighting switch control circuit. The gradual change type lighting switch control circuit comprises an input preprocessing module, a boost conversion module, a flyback conversion module, a step-down constant current module, a voltage detection output module and a single-chip microcomputer control module. The boost conversion module can quickly adjust the harmonic content of the current, keep synchronization with the waveform of the input current, and meet the requirement for the harmonic current. The single-chip microcomputer control module accurately controls the current of the lighting load by outputting a gradually-changed PWM duty ratio signal to the step-down constant-current module, so that the effects of slowly lighting on the lamp and slowly extinguishing off the lamp are achieved. Besides, the circuit is also provided with a first dial switch and a second dial switch, so that the slow lighting time of the lighting load in the light turning-on process can be adjusted, and the flexibility of the gradual change type lighting switch control circuit is improved.

The application discloses a kind of based on composite micro-nano structure dynamic adjustable slow light device and its design method, including substrate, and gold nanorod array and hBN nanobelt being arranged above substrate;hBN nanobelt is located at the gap between gold nanorod two two, gold nanorod array and hBN nanobelt are perpendicular to each other on xy plane;Substrate material selects non-infrared active CaF2.The application utilizes the strong coupling and weak coupling between the gap plasmon mode supported by gold nanorod and the hyperbolic phonon polariton mode supported by hBN nanobelt to realize electromagnetic induction transparent phenomenon, and the group delay generated thereby can be used as slow light device;By adjusting the angle of incident light, dynamic regulation of group delay can also be realized, i.e., a dynamically adjustable slow light device is realized;And, due to the existence of high-order hyperbolic phonon polariton, the device can also realize the conversion function of fast and slow light.

The invention discloses a chiral ultra-slow light all-dielectric metasurface based on a continuous domain bound state and an implementation method thereof, and belongs to the technical field of metamaterials and photonics. The metasurface comprises a high-refractive-index dielectric substrate and unit structures periodically arranged on the high-refractive-index dielectric substrate, and each unit structure comprises at least two sub-wavelength holes. In an undisturbed state, the unit structure has high symmetry so as to support the BIC with symmetric protection. Structural disturbance (such as size change or inclination angle change) is introduced into the hole to break the symmetry, so that the BIC is converted into a quasi-BIC, and two polarization singular points with opposite chirality are formed in a momentum space. According to the invention, the topological characteristics of the BIC are ingeniously utilized, huge external and internal chiral responses (CD value is close to 1) can be realized under oblique incidence and normal incidence respectively, a remarkable spin-dependent slow light effect is generated, and the group delay of one spin state can be up to microsecond magnitude. The invention provides a novel efficient and flexible chiral light regulation and control scheme which has important application value in the fields of polarization communication, quantum photonics and the like.

The present invention discloses a multi-band omnidirectional matching stealth structure. From the outside to the inside, the stealth structure comprises a semi-circular cylindrical metal sheet cavity, a semi-cylindrical cavity, a rectangular cylindrical metal sheet cavity, and a triangular cylindrical cavity. The semi-circular cylindrical metal sheet cavity and the rectangular cylindrical metal sheet cavity together form a quadrilateral stealth area, which is used to place the stealthed object. The semi-circular cylindrical metal sheet cavity and the rectangular cylindrical metal sheet cavity are respectively provided with a non-uniform Fabry-Perot resonant cavity array and a uniform Fabry-Perot resonant cavity array. The non-uniform Fabry-Perot resonant cavity array and the uniform Fabry-Perot resonant cavity array are both composed of a plurality of metal sheets arranged at intervals, with dielectric material filled between each metal sheet. Slow light speed material is arranged in the semi-cylindrical cavity and the triangular cylindrical cavity. The present invention has a simple structure, convenient design, matches with free space, has low scattering, can operate in multiple frequency bands, and can be widely used in various military fields such as radar, target stealth, and sensing.

The present disclosure relates to a device (100) for determining orientation of an object (200). The device comprises a housing (102), at least one light source (104), a plurality of light detectors (106), an optical medium (OM) configured to reduce a first beam of light into a second beam of light (103, 103 A) which is a beam of slow light. The second beam of light (103) is configured to incident on a first light detector (Si) when the object is positioned at an initial position (IP) and the second beam of light (103 A) is configured to incident on one or more second light detectors (S2), when the object is displaced from the initial position to a displaced position (FP). A control unit (140) is configured to determine the orientation of the object (200) based on the signal on change of incidence of the second beam of light (103, 103A).

The invention provides a programmable photon processing core structure based on a periodic bimodal waveguide, and the structure comprises a waveguide grid which comprises a plurality of tunable basic units based on the periodic bimodal waveguide, and the tunable basic units are in topological cascade connection to form the waveguide grid in a preset shape; and the control circuit is arranged above the waveguide grid and is connected with the tunable basic units and the power supply. The programmable photon processing core structure based on the periodic double-peak waveguide integrates the advantages of slow light and small size of the periodic double-peak waveguide and flexible and programmable photon topological cascade architecture, light control is carried out on the nanoscale, the interaction between light and substances is enhanced, the size of a device is remarkably reduced, and the performance of the device is improved. The integration level is improved, the half-wave energy consumption is reduced at the same time, and finally a high-integration, programmable and extensible photon processing core structure is achieved.

The invention provides a double-cavity integrated MEMS atomic clock and a preparation method thereof, and belongs to the technical field of micro electro mechanical systems and precise timing. According to the invention, the photonic crystal regulation and control layer is provided with the cavities in array arrangement, the cross sections of the cavities are cross-shaped, the cavities have orthogonal symmetry and dual-band band gap characteristics, and meanwhile, the fluorescence signal intensity is improved through a surface plasma resonance effect, so that the optical efficiency is improved; the cross-shaped structure has symmetrical thermal expansion distribution and low thermal stress deviation, so that the thermal mechanical stability is improved; the waveguide wire is coupled with the cavities arranged in the array in the photonic crystal regulation and control layer through the coplanar waveguide to form a composite resonant cavity, and the slow light effect of the cavities arranged in the array in the photonic crystal regulation and control layer is utilized to prolong the interaction time of atoms and microwaves, so that the thermal mechanical stability is improved; the coplanar waveguide layer is provided with the conductive adhesive, so that effective transmission of microwave signals can be realized, and the optical efficiency is further improved.