42 results about "Slow light" patented technology

The invention provides an electro-optical modulator combining a slow light waveguide and a capacitive load type traveling wave. The electro-optical modulator comprises the slow light waveguide, a capacitive load type traveling wave electrode, a multi-mode interferometer, a mixed single-mode waveguide, a micro-ring structure and a micro-ring upper phase adjusting electrode. Capacitive load type traveling wave electrodes are arranged between and on the side edges of a pair of slow light waveguides which are arranged in parallel, the two ends of the slow light waveguides are connected to one end of a multimode interferometer through mixed single-mode waveguides respectively, the other end of the multimode interferometer is provided with two ports, one port is used for being connected with a micro-ring structure, and the other port is used for being connected with a micro-ring structure. The other port is used as the input end or the output end of the electro-optical modulator, and the two sides of the micro-ring structure are provided with micro-ring upper phase adjusting electrodes. The group refractive index and the working bandwidth of light can be regulated and controlled by adjusting the geometric parameters of the slow light waveguide, and low dispersion and high group refractive index can be realized in a wide optical bandwidth range; through a sectional capacitance load type slow wave electrode structure, the regulation and control of the microwave refractive index are realized, and the electro-optical modulation bandwidth is improved.

The invention provides an electro-optical modulator based on a slow light effect. The electro-optical modulator comprises a substrate, a bottom electrode, an insulating layer, a slow light waveguide layer, an upper cladding and a signal electrode which are sequentially stacked from bottom to top. Wherein the slow light waveguide layer is a photonic crystal waveguide based on Z-cut film lithium niobate, the photonic crystal waveguide comprises a line defect waveguide and a plurality of air holes arranged in a triangular lattice structure, and the plurality of air holes are symmetrically arranged at two sides of the line defect waveguide. A photonic band gap is formed by a two-dimensional periodic optical medium structure formed by combining air holes arranged in a triangular lattice structure and Z-cut film lithium niobate, the slow light effect is achieved, and light waves in a specific frequency range can only be spread along a line defect waveguide by introducing the line defect waveguide. According to the invention, the interaction between the light field and the electric field is enhanced, the modulation efficiency and performance of the electro-optical modulator can be remarkably improved, and the development trend of miniaturization, integration and high speed of an existing communication network is met.

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 present invention provides a waveguide-type germanium photodetector based on a photonic crystal and a preparation method thereof. The germanium photodetector includes: a silicon waveguide structure; a germanium photodetector connected to the silicon waveguide structure. The germanium absorption region of the germanium photodetector and the peripheral silicon material region around the germanium absorption region have periodically arranged dielectric materials to form a photonic crystal structure with a slow light effect. Compared with the traditional waveguide-type germanium photodetector, the present invention can achieve a more efficient light absorption efficiency, and by reducing the device size, a photodetector with low dark current, low capacitance and high responsivity can be prepared.

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 present invention provides a polarization-based multimode coupling tunable electromagnetically induced transparency-like device, which includes a dielectric plate. The dielectric plate is provided with a double-layer metal resonant structure. The double-layer metal resonant structure includes a circular resonator, an H-shaped resonator, and a split-ring resonator. The top surface of the dielectric plate is provided with the circular resonator and the H-shaped resonator. The H-shaped resonator is arranged inside the circular resonator, and the H-shaped resonator and the circular resonator are in non-contact with each other. The bottom surface of the dielectric plate is provided with the split-ring resonator. By changing the polarization direction of the incident electromagnetic wave, the switching between single-peak and double-peak of the electromagnetically induced transparency-like is realized. This polarization-based multimode coupling tunable electromagnetically induced transparency-like device can realize the switching between single and double transmission windows in the electromagnetically induced transparency-like by changing the polarization direction, and can produce a strong slow light effect accompanied by a large group delay, having potential application value in the field of sensors.

Optical waveguide interferometric sensing device, esp. biosensor, in photonic integrated circuits apparatus, comprising a waveguide layer for receiving an optical signal and propagating said optical signal in accordance with a predetermined optical waveguide propagation mode, and a testing medium surface in communication with the waveguide layer and responsive to a testing medium for modifying at least one characteristic of the propagated optical signal in relation to a given parameter of said testing medium, whereby the modified characteristic of the propagated optical signal is measurable in view of determining the given parameter of said testing medium, wherein said device comprises biosensors, resp. photonic and plasmonic components (101, 102, 111) in specifically designed MZI configurations (101), especially planar plasmonic waveguides (111), which are monolithically integrated in photonic integrated circuits, wherein it comprises Bragg-grating-based plasmonic waveguides (402, 502, 602, 609), which are co-integrated with photonic waveguides (102, 605, 606), which consist of integrated waveguides, wherein a slow light mechanism means is incorporated in the device being used with Bragg diffraction barrier means (602) in order to boost sensitivity to unprecedented levels retaining a short transducer length, wherein means with a length of photonic waveguide in one MZI branch are incorporated in the device thereby increasing the free spectral range (FSR) for improving architectural sensitivity, as well as tailoring means for tailoring the photonic geometry, taking into account a second order dispersion in the plasmo-photonic MZI branches (605, 606). Method therefor.

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 discloses a design method of a topological photonic flat band, and relates to the technical field of optical information, and the method comprises the following steps: arranging a plurality of dielectric cylinders with C6 rotational symmetry on a topological photonic crystal primitive cell lattice; part of the dielectric cylinders are shrunk inwards along the center of the crystal lattice to form a common area; extending the rest dielectric cylinders outwards along the center of the crystal lattice to form a non-trivialness area; and combining the trivialness region and the non-trivialness region to form a supercell crystal, and obtaining a topological photon flat band under optical excitation. A topological boundary state photon flat band which covers a full Brillouin region and has extremely low group velocity is realized, and the topological boundary state photon flat band is protected by the topology of a wide band gap, so that the development of a novel topological slow light device is facilitated.

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.

The invention provides a triple plasma induced transparent graphene metasurface structure based on a synergistic effect. The triple plasma induced transparent graphene metasurface structure based on the synergistic effect sequentially comprises a Si substrate, a graphene layer and a Si covering layer from bottom to top, the optical characteristics of the metasurface can be effectively changed by changing the Fermi level of graphene, a refractive index sensor with the sensing quality factor of 34.6 RIU <-1 > can be achieved, and meanwhile the metasurface has the excellent performance that the sensitivity is 1.32 THz / RIU. The slow light performance of the metasurface can be well enhanced by changing the carrier mobility of graphene, so that the metasurface has potential application prospects in the aspect of optical storage devices, and the group refractive index reaches up to 1109.

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 discloses a metamaterial for realizing tunable electromagnetic induced transparency in dual polarization channels. By designing a composite metamaterial, tunable electromagnetic induction phenomenon in the near-infrared band in dual polarization channels is achieved. The designed metamaterial includes a base layer at the bottom and periodically spaced dielectric squares and vanadium dioxide squares attached to the upper surface of the substrate. The present invention can achieve tunable electromagnetic induced transparency phenomenon in dual polarization channels in the near-infrared band by selecting the materials of the substrate and the dielectric squares and designing the size parameters between various components. When x-polarized light and y-polarized light are respectively incident on the metamaterial, high-quality electromagnetic induction phenomenon can be achieved in the near-infrared band. In addition, by adjusting the conductivity of vanadium dioxide, flexible regulation of the electromagnetic induced transparency window will be realized. This structure has important application potential in optical switches, slow light devices and high-sensitivity refractive index sensors, and can improve the integration of devices and realize the miniaturization of devices.

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.

The present invention discloses a radome based on phase control and transmission technology, wherein the radome left-handed circularly polarized wave path coupling module and the radome right-handed circularly polarized wave path coupling module are staggered, the radome left-handed circularly polarized wave path coupling module and the radome right-handed circularly polarized wave path coupling module are both centrally symmetrically distributed, and the radome left-handed circularly polarized wave path coupling module and the radome right-handed circularly polarized wave path coupling module are fixedly connected to each other using a um-level coating process. In addition to having a basic physical protection function for the antenna, the present invention can also realize electromagnetic induced transparency technology through destructive interference of two energy states, thereby causing the signal to produce a slow light effect. At the same time, the present invention can realize adjustable circular-linear polarization conversion and realize controllable electromagnetic stealth in a fixed band, thereby achieving low loss and functional diversity of the radome.

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.

The present invention relates to the technical field of topological photonic crystals, and particularly relates to a topological valley photonic crystal, a broadband topological slow optical waveguide, and a topological beam splitter. The crystal includes a substrate and a nano-pillar array disposed on the substrate; the nano-pillar array is composed of a plurality of honeycomb-structured unit cells arranged, and the two-dimensional cross-section of each unit cell is a regular hexagon; the unit cell is composed of two types of nano-pillars with different cross-sectional diameters arranged at intervals; two adjacent unit cells share a common edge; the two types of nano-pillars with different cross-sectional diameters are respectively a first nano-pillar and a second nano-pillar, and the diameter of the first nano-pillar is twice that of the second nano-pillar; the lattice constant a has a value range of 480 to 520 nm. The advantages are as follows: solving the problem of broadband slow light regulation in topological optical waveguides; realizing the Brillouin zone winding of the valley boundary state mode, reducing the group velocity of the optical mode; improving the robustness of optical transmission; reducing the backscattering loss caused by manufacturing defects and disorder; and broadening the applicable frequency range of the device.