18 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.

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 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.

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.

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 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 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.