152 results about "Resonance wavelength" patented technology

The invention discloses an implementation method and device for fast scanning CRDS sensing, and relates to the technical field of ring-down cavities, and the method comprises the following steps: employing a PID algorithm to control and adjust the temperature and pressure in a ring-down cavity to stabilize the resonance mode of the ring-down cavity, and carrying out the collection operation of a cavity mode signal after the adjustment of the temperature and pressure is completed; obtaining a wavelength value of the laser light source after entering the etalon based on the transmittance value, feeding back the wavelength value to a wavelength controller, and adjusting the laser to a spectrum detection wavelength by using the wavelength controller; scanning operation is executed based on the detection wavelength to determine the resonant wavelength, secondary scanning is performed with the resonant wavelength as the center to obtain a ring-down curve, and gas characteristic absorption line measurement is completed through point-by-point scanning. According to the invention, the etalon, the precise wavelength locking and adjusting system and the unique cavity mode scanning mode are utilized to realize high-repetition-frequency rapid scanning of the ring-down signal, so that the triggering speed of the ring-down event is improved.

The invention relates to a topological photonic crystal-based optical filter design method, equipment and medium, and the method comprises the steps: constructing a periodically arranged photonic crystal flat plate, and enabling a super unit to be composed of a topological non-trivial unit and a topological trivial unit, and the topological characteristic and the arrangement mode of the topological non-trivial unit are determined by calculating the two-dimensional bundling phase so as to form a topological defect state. And then, by adjusting the width of the air micropores and the defect spacing, the flatness and the coupling strength of a defect state energy band are optimized, and the stability of the resonant wavelength is ensured. Full-wave electromagnetic simulation is adopted to test transmission spectrums under different incident angles, the angle insensitivity characteristic of resonant wavelength is verified, and key structure parameters are iteratively optimized. Finally, an optical filter with efficient filtering, low energy consumption, high integration level and anti-interference capability is output, and the optical filter is widely applied to the fields of optical communication, optical sensing, high-precision spectral analysis and the like.

The invention provides a transcendental extreme ultraviolet light source device which comprises a free electron laser main body which comprises an undulator system and an optical resonant cavity. The undulator system comprises a modulation section undulator and a radiation section undulator; the optical resonant cavity comprises resonant cavity reflectors and a dispersion section, and the modulation section undulator, the dispersion section undulator and the radiation section undulator are sequentially arranged in the direction of an electron beam and are all located between the resonant cavity reflectors; the resonant wavelength output by the radiation section undulator is 1 / h of the resonant wavelength of the modulation section undulator, h is the harmonic number, and when the resonant wavelength output by the radiation section undulator is 6-7nm, the radiation wavelength reflected by the resonant cavity is h times of the resonant wavelength output by the radiation section undulator, so that the resonant cavity is prevented from adopting a reflector with the reflection wavelength of 6-7nm. According to the device, the radiation of the target wavelength is output by using harmonic waves, and a reflector with relatively long wavelength and mature technology can be directly used; various accelerators are compatible, the energy efficiency of the accelerators is greatly improved, and power consumption is reduced.

The invention discloses a micro-ring resonant wavelength locking method, device and equipment and a storage medium, and relates to the technical field of resonant wavelength locking, and the method comprises the steps: obtaining an initial power search range corresponding to a micro-ring heater; performing preset equal difference comparison on the initial power search range based on a preset power difference value to obtain optimized heating power; determining a target error signal according to a preset perturbation signal and the optimized heating power; and determining the locking direction of the resonant wavelength corresponding to the target micro-ring based on the target error signal. According to the method, the threshold value of the optical signal difference is set and the optical signal difference value is compared, so that the optimal heating power is gradually reduced and quickly determined, and the optimal heating power search range is obtained; and then, in the optimal heating power search range, determining the adjustment direction of the power of the micro-heater by using a perturbation technology and the target error signal, and accurately locking the resonant wavelength of the micro-ring at the target wavelength. Therefore, the micro-ring resonant wavelength can be quickly and accurately locked.

The present invention relates to a nanodrone, a method of operating a nanodrone, and a system for operating a nanodrone. The nanodrone comprises a substrate extending perpendicular to a normal direction and two or more nanoantennas arranged on and / or in the substrate. Each of the two or more nanoantennas exhibits an optically addressable resonance at a respective resonance wavelength. The two or more nanoantennas comprise a first nanoantenna and a second nanoantenna, each being configured to scatter circularly polarized light at the respective resonance wavelength that is incident on the nanoantenna along the normal direction such that photons of the scattered light have a mean wavevector (I) and (II) in a plane perpendicular to the normal direction for left- and right-circularly polarized light, respectively, with i=1 for the first nanoantenna and i=2 for the second nanoantenna. The mean wavevector (III) with ji=L or R is non-zero. The mean wavevector (IV) with (V) for ji=R and (VI) for ji=L is substantially zero or substantially anti-parallel to (III). At least one of (VII) and (VIII) is substantially parallel or substantially anti-parallel to one of (IX) and (X).

A miniaturized interference integrated photonic gyroscope structure with top, middle and bottom silicon oxides deposited on a silicon substrate includes a broadband optical source or a semiconductor optical amplifier with a silicon nitride ring resonator wavelength filter, the silicon nitride ring resonator wavelength filter is connected with the thin film lithium niobate or piezoelectric actuation silicon nitride phase modulator, and the thin film lithium niobate or piezoelectric actuation silicon nitride phase modulator is vertically coupled with the silicon nitride waveguide spiral ring. A silicon nitride waveguide spiral ring is patterned on the thin bottom oxide layer and connected to the germanium detector by photonic wire bonding or by vertical integration of a mirror embedded into the silicon wafer with an air trench beneath the silicon nitride waveguide spiral ring. Various methods of coupling alternative materials are described, as well as the potential to connect several helical waveguides in gyroscope applications for enhanced sensitivity.

A display device comprises a plurality of pixels, each with a filter element. The display device also includes a laser light source for emitting source light with an adjustable wavelength. The source light can be sequentially directed into the filter elements of the pixels. Each filter element has an emission spectrum that exhibits an intensity maximum at a resonance wavelength that depends on a specific emission angle.

A method of wavelength tuning in a silicon photonics circuit includes receiving a bus waveguide, a ring resonator optically coupled to the bus waveguide, and a dielectric layer over the bus waveguide and over the ring resonator. The method further includes performing a first heat process at a first temperature to heat up the dielectric layer, where the first heat process shifts an initial resonance wavelength of the ring resonator to a first resonance wavelength shorter than the initial resonance wavelength. The first heat process permanently shifts the initial resonance wavelength to the first resonance wavelength, the first resonance wavelength being a wavelength when no heat is being applied to the ring resonator.

The present invention relates to the technical field of optical analog computing, and specifically provides a planar micro-nano optical analog computing device. A planar micro-nano optical element includes a micro-nano structure. By adjusting a physical parameter of the micro-nano structure, the planar micro-nano optical element corresponds to different transfer functions at different resonance wavelengths, and a relationship curve between the transfer function and an incident wave vector at different resonance wavelengths is rectangle bandpass filtering functions with different bandwidths. According to the present invention, based on the planar micro-nano optical element, required transfer functions at different wavelengths are designed, so that a wavelength-controlled two-dimensional multi-channel image optical analog computing device with a high numerical aperture and insensitive polarization can be implemented, and differential image processing can be performed on target objects with different structural sizes selectively.

A laser cavity-based sensor and a sensing method for measuring a measurand are provided. The laser cavity-based sensor includes a laser cavity configured to generate light at a resonant wavelength and having a gain medium and a resonant structure. The resonant structure has a sensing micro-ring resonator (MRR) and a control MRR arranged in a Vernier configuration defining the resonant wavelength of the laser cavity. At least a portion of the sensing MRR is accessible for interaction with said measurand. The sensing method involved operating the laser cavity at an initial resonant wavelength, interacting the measurand with the sensing MRR, tuning the control MRR to operate the laser cavity at a shifted resonant wavelength, and calculating a wavelength shift of the resonance wavelength of the laser cavity induced by the measurand.

The invention provides a spectrum enhancement filtering metasurface method based on multi-physics field coupling, and the method comprises the steps: building a heat-force multi-physics field model of a metasurface under the incidence of high-power laser, obtaining a temperature field through calculation, and recognizing a hot spot region based on the temperature field; calculating a thermal stress field based on the temperature field, calculating refractive index variation and distribution of the metasurface material based on the temperature field and the thermal stress field, further quantifying resonant wavelength drift caused by the refractive index variation, and positioning an optical mode mismatch area; reversely designing geometric parameters of a compensation structure based on the resonant wavelength drift distance and the optical mode mismatching region; preparing a compensation type metasurface sample according to the geometric parameters, and testing the spectral response of the compensation type metasurface sample under high-power laser; based on the spectral response, the spectral enhancement filtering stability of the compensation type metasurface sample is evaluated, the problem of thermal-optical mismatch caused by high-power laser is solved, and long-term stable operation of the spectral filtering function in a severe environment is achieved.

The invention discloses a spectrum polarization detection method based on a quasi-continuous domain bound state metasurface, and belongs to the application field of micro-nano optics and spectrum polarization detection. The implementation method comprises the following steps: adopting a symmetrical broken elliptical amorphous silicon nano-column arrangement mode to obtain a metasurface structure unit with a narrow-band formant, a high-quality factor and linear polarization dependence; the method comprises the following steps: analyzing a change rule of resonance wavelength along with geometric parameters of a structural unit and a change rule of resonance intensity along with a polarization state of incident light through numerical simulation to obtain a series of metasurface structures with different resonance wavelengths and different polarization responses, reasonably arranging the metasurface structures, processing a metasurface sample, and testing a reflection spectrum of the metasurface sample, and the spectrum and polarization response characteristics are calibrated. A spectrum polarization detection system composed of a detection target, a metasurface and a CMOS detector is built, and the spectrum and polarization information of the target is detected based on the spatial position arrangement of the metasurface structure and the Stokes relation by using gray information shot by the CMOS detector.

A chemiluminescent nanoconstruct is described herein. The chemiluminescent nanoconstruct structure may comprise a plasmon nanostructure having at least one localized surface plasmon resonance wavelength ([lambda] LSPR), at least one spacer coating, at least one chemiluminescent agent having a maximum emission wavelength ([lambda] EM), and at least one biorecognition element. The signal of the chemiluminescent nanoconstruct structure is greater than the signal of only the at least one chemiluminescent agent.

This invention discloses a bimetallic hybrid metasurface that achieves polarization-selective absorption and tunable liquid immersion. The metasurface consists of a three-layer structure: a bimetallic hybrid layer, a silicon dioxide layer, and a silver reflective layer. The bimetallic hybrid layer is composed of aluminum and titanium nanoribbons. The bimetallic hybrid metasurface achieves perfect absorption of incident light under x-polarized light at the resonant wavelength and specular reflection of incident light under y-polarized light, thus exhibiting a high extinction ratio. Furthermore, the absorption peak wavelength of the metasurface can be continuously and dynamically tuned by adjusting the unit period of the metasurface or by utilizing active tuning through liquid immersion. The bimetallic hybrid metasurface proposed in this invention achieves high-contrast polarization-selective absorption and possesses advantages such as simple structure, ease of integration, and dynamic tunability, thus it can be widely applied in practical applications such as novel optical polarizers and photodetectors.

The invention discloses a tuning type spectrum detection chip and application thereof. The chip comprises a carrier and a plurality of spectrum detection units arranged on the surface of the carrier at intervals, the carrier can rotate around the rotating shaft to change the incident angle of the incident light, and the polarization direction of the incident light is perpendicular to the rotating shaft; each spectrum detection unit comprises a one-dimensional grating structure and a detector which are sequentially arranged in the light transmission direction, the plane where the one-dimensional grating structure is located is parallel to the rotating shaft, and when the incident angle is within the set range, the wavelength ranges sampled by the multiple spectrum detection units are different from one another. According to the invention, a plurality of spectrum detection units are cascaded on a single chip, an integrated spectrum detection chip with an ultra-large wavelength range can be realized under limited tuning efficiency, one spectrum detection unit is set as a de-unit, and the resonant wavelength of the de-unit is isolated from the working wavelengths of other spectrum detection units, so that the spectrum detection efficiency is improved. The method can be used for more effective de-noising signal processing, and high-precision anti-interference spectrum detection is realized.

The invention discloses a visible light metasurface based on surface lattice resonance and a design method thereof. The design method comprises the following steps: constructing a dimensionless parameter space of a metasurface structure; performing simulation scanning in the dimensionless parameter space to determine main parameters strongly related to the resonant wavelength and secondary parameters weakly related to the resonant wavelength; setting the secondary parameter as a fixed value, taking the main parameter as a single design variable, determining the value of the main parameter according to the target resonant wavelength, and designing the serialized metasurface with the resonant wavelength continuously adjustable in the visible light range. According to the method, the design process can be obviously simplified, the process robustness can be greatly improved, the harsh dependence on the processing precision of the nano unit is reduced, the compatibility with the mainstream micro-nano processing process is ensured, and the stability and reliability of the device performance are ensured.

A sensor device with the following features is provided: - an optical cavity (3), - fluorescent emitters (7) configured for emitting secondary electromagnetic radiation (8), when excited by primary electromagnetic radiation (9), and - binding sites (10) configured for binding of the substance (11) to be detected, wherein - the secondary electromagnetic radiation (8) comprises a resonance wavelength of an optical bound state in continuum (4) of the optical cavity (3) and / or a resonance wavelength of an optical quasi bound state in continuum of the optical cavity (3), and - the binding sites (10) are arranged such that an optical symmetry of the optical cavity (3) is broken, when the substance (11) to be detected binds to the binding sites (10). Further, a method for detecting a substance is provided.

The invention discloses a method for measuring a residual birefringence difference value of a transparent ferroelectric electro-optical material based on a Fabry-Perot resonant cavity. The method comprises the following steps: constructing a Fabry-Perot resonant cavity measuring light path consisting of a broadband light source, a polarization control assembly and a sample to be measured; the polarization state of incident light is accurately controlled through a magnetic control Faraday rotating mirror, and transmission spectrums in the o-light direction and the e-light direction are obtained respectively; a high-precision spectrum acquisition module is adopted to record transmission spectrum characteristics; based on an original spectrum processing algorithm, the residual birefringence difference value of the to-be-detected material is calculated by analyzing the resonant wavelength offset and the free spectrum range change of the o-light and e-light transmission spectrums. The method solves the problem that the weak birefringence detection capability of the existing measurement technology is insufficient, has the advantages of high measurement precision, strong anti-interference capability and the like, and is suitable for performance evaluation, process optimization and device performance improvement of the transparent ferroelectric electro-optical material.

The present invention discloses an SPR sensor based on a defect disk coupled nanorod structure, comprising a silicon dioxide substrate and at least one metal nanounit arranged on the silicon dioxide substrate; each metal nanounit is composed of a metal nanodefect disk and a metal nanorod; there is a gap between the metal nanodefect disk and the metal nanorod; the metal nanodefect disk is a circle with a rectangular notch on the edge; the metal nanorod is a rectangle; the rectangular notch on the metal nanodefect disk faces the direction of the metal nanorod, and the center line of the wide side of the rectangular notch is perpendicular to the center line of the wide side of the metal nanorod. The present invention generates a dipole through the metal nanodefect disk and the metal nanorod, and the two dipoles are coupled to each other to generate a surface plasma resonance peak. By changing the geometric parameters of the metal nanounit, the resonance intensity and the resonance wavelength position of the surface plasma resonance can be regulated, and high sensitivity can be obtained.

The invention belongs to the technical field of optical thin films, display imaging and holographic storage, and particularly discloses a chalcogenide phase-change material-based dynamic programmable narrow-band optical filter, a first Bragg reflector, a middle spacing layer and a second Bragg reflector form a Fabry-Perot resonant cavity, the resonant wavelength of the Fabry-Perot resonant cavity is determined by the optical thickness of each thin film, and the thickness of the Fabry-Perot resonant cavity is smaller than that of each thin film. The optical filter is used for outputting different transmission spectrums by changing the central wavelength of filtered light; the chalcogenide phase change material layer is used for realizing on-off and gray scale adjustment of a transmitted spectrum through a phase change process from an amorphous state to a crystalline state; and the top anti-reflection layer is a third transparent dielectric layer, and is used for anti-reflection of the transmitted spectrum and preventing oxidation of the chalcogenide phase change material. According to the invention, excellent narrowband filtering characteristics and high color saturation are realized, and high switch contrast is realized by using significant difference of extinction coefficients before and after phase change of the phase change material.

The application relates to a surface enhanced Raman scattering (SERS) substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection. The substrate comprises, from bottom to top, a substrate layer, a distributed Bragg reflector, a chalcogen phase change material functional layer and a nanoscale metal structure layer. The distributed Bragg reflector is composed of a periodic structure stack of medium materials with different refractive indexes. The distributed Bragg reflector is coupled with the nanoscale metal structure layer to excite a Tamm state. The chalcogen phase change material functional layer can realize reversible regulation of amorphous state and crystalline state under external light excitation, changes the Tamm state resonance wavelength to regulate the SERS enhancement effect. The application realizes high-sensitivity detection through double enhancement of the Tamm state and localized surface plasmon resonance, has the characteristics of non-volatility, reconfigurability, high reproducibility and design flexibility, is convenient to operate, stable in performance, and is suitable for fields of chemical biological sensing, laboratory chip systems and optical encryption.

An optical device useful for spatial light modulation. The device comprises: a semiconductor layer having a first surface and a second surface, the semiconductor having an electric field-dependent resonance wavelength; a first electrode electrically connected to the semiconductor layer; a first insulating layer adjacent to the first surface of the semiconductor layer, and a second insulating layer adjacent to the second surface of the semiconducting layer, the first and the second insulating layers each being optically transparent at the resonance wavelength; a first group of at least one gate electrodes disposed adjacent to the first insulating layer, and a second group of at least one gate electrodes disposed adjacent to the second insulating layer, each gate electrode being at least 80% optically transparent at the resonance wavelength; wherein the first and the second groups of gate electrodes, taken together, form at least two regions in the semiconductor layer, an electrostatic field in each of the at least two regions being independently controllable by application of voltage to the first and the second groups of gate electrodes, the at least two regions abutting each other along at least one boundary.

The invention discloses an MIM waveguide sensor based on Fano resonance and an application method of the MIM waveguide sensor, and relates to the technical field of optical devices. A metal coating is plated on the substrate; a U-shaped resonant cavity is etched on the metal coating, and a metal-medium-metal MIM straight waveguide is etched below the U-shaped resonant cavity; wide-spectrum light enters from the left side of a straight waveguide and exits from the right side of the straight waveguide, and when resonance is excited, light beam energy corresponding to the resonance wavelength is coupled into a U-shaped resonant cavity, so that the transmissivity of the wavelength is reduced, and a transmission peak is formed; the sensor has a wide and stable low refractive index detection range.

A Vertical Cavity Surface-Emitting Laser (VCSEL) has a body comprising a vertical stack of semiconductor layers one on top of the other, including: a current confinement region including an area of low resistance to current flow defined by an area of high resistance to current flow, and a first epitaxial sublayer disposed proximate to the current confinement region, the first epitaxial sublayer including a protrusion or a recess defines a main cavity, and the balance of the first epitaxial sublayer defines an outer cavity; wherein the protrusion or recess is defined by a physical step h that is predetermined according to the equation: qλ0−mλ1=n0h where λ0 is resonant wavelength of light in the main cavity, λ1 is resonant wavelength of light in the outer cavity, q is a half-integer positive number, n0 is effective refractive index in the main cavity, and m is a constant.

The present invention discloses an integrated optical waveguide device, an endoscope probe and an all-optical photoacoustic endoscope sensing system, wherein the core layer of the integrated optical waveguide device includes a wave splitter, a first wavelength transmission area and a sensing reflection area connected to the wave splitter in sequence along the light transmission direction; the wave splitter is used to separate light of different wavelengths; the first wavelength transmission area is used to realize the transmission of pulsed light; the sensing reflection area is used to simultaneously realize the transmission, reflection or resonance of a preset wavelength optical signal, and monitor the change of the resonant wavelength or the reflection wavelength, and then monitor the change of environmental parameters. In the endoscope probe, the sensing light signal and the pulse light signal share a double-clad optical fiber, making the endoscope probe more compact. The integrated optical waveguide device of the present invention can realize signal and function separation, and the endoscope probe including the integrated optical waveguide device has high sensitivity, high longitudinal resolution, small size, high integration, and can be used in narrow spaces such as inner cavities.

The invention discloses a strong dispersion dielectric grating guided mode resonance optical filter insensitive to angles. The filter is based on a strong-dispersion sub-wavelength dielectric grating structure, and the resonant wavelength shows the characteristic of being insensitive to the change of an incident angle. By reducing the thickness of the grating layer and the grating line width, the angle sensitivity of the device can be further reduced. The insensitivity of the wavelength of the device to the angle mainly depends on the intrinsic dispersion characteristic of an excited optical mode in the device, that is, the frequency of the optical mode with strong dispersion changes slowly along with in-plane wave vectors, so that the change of the far-field frequency response along with the angle is obviously slowed down. Based on the principle, an angle-insensitive metasurface device can be designed by using a strong dispersion optical mode. The design method provided by the invention is not only suitable for an optical filter, but also can be popularized to other metasurface devices with strict requirements on angle sensitivity, and has wide application prospects in the fields of optical communication, hyperspectral and multispectral imaging, sensing and the like.

The application provides a visible light band optical fiber SPR liquid refractive index linear measurement device and method, the device comprises a broadband light source, a first lens and a second lens, a polarizer, a third lens and a fourth lens, a pinhole, a fifth lens, an optical fiber SPR, a sixth lens, a diffraction grating, a concave mirror, a linear array CCD and a data processing unit; the data processing unit is used for extracting the resonance wavelength corresponding to the normalized light intensity minimum value from the wavelength-intensity spectrum curve, and calculating the refractive index of the liquid medium to be measured according to the linear relationship between the refractive index and the resonance wavelength which is calibrated in advance. The device is not only intuitive in optical path debugging and easy to operate, but also has a rigorous theoretical model and high measurement precision, and is very suitable for rapid and accurate refractive index screening and analysis of a large number of low-concentration liquid samples, and has wide application prospect and industrial value.

The application belongs to the technical field of micro-nano optics, and discloses a superstructure crystal and a method for realizing dynamic control of fluorescence based on the superstructure crystal. The superstructure crystal provided by the application comprises a substrate layer as a bottom layer and a hydrogel array layer as a top layer, the hydrogel array layer is prepared by uniformly mixing a hydrogel and a quantum dot solution, the hydrogel array comprises periodically arranged air holes, the optical response of the superstructure crystal depends on the thickness, period and size of the air holes of the hydrogel array layer, and the resonance characteristics of the superstructure crystal dynamically change with the environmental humidity. By changing the environmental humidity, the bound state q-BIC resonance wavelength in the quasi-continuous spectrum of the superstructure crystal is moved, and the wavelength and angle of the incoherent fluorescence emission are dynamically controlled. The application can improve the dynamic control performance of the wavelength and angle of the fluorescence control of the quantum dots, and effectively adjust the fluorescence emission.

The invention discloses a multi-image narrowband display and encryption method based on an F-P cavity integrated metasurface. According to the method, two metasurface structures with different sizes are integrated above an F-P cavity with proper cavity length and thickness, so that the device is endowed with a dual-band narrow-band transmission filtering characteristic, and independent regulation and control on amplitude and polarization are realized under respective resonant wavelengths. Specifically, the two metasurface structures present a significant polarization-independent transmissivity difference at a wavelength 1, and present as a quarter-wave plate with a polarization conversion function at a wavelength 2. An array is constructed based on the device, and three different binary images (images 1, 2 and 3) can be encrypted and hidden in the structural array by using the dual-band narrow-band filtering and the amplitude and polarization regulation and control characteristics of the device. Wherein the gray value of the image 1 determines the size of the metasurface structure at any position, and the image 2 and the image 3 determine the rotation angle of the metasurface structure at the position. Specifically, under the wavelength 1, right-handed circularly polarized light is incident, and an encrypted image 1 can be observed; under the wavelength 2, right-handed circularly polarized light is incident and detected by polarization analyzers with polarization angles of 0 degree and 45 degrees respectively, and the encrypted image 2 and the encrypted image 3 can be observed. Due to the dual-band narrow-band filtering characteristic of the method, a clear image cannot be observed under a non-filtering wavelength, and the security of metasurface optical encryption is improved.

The present invention relates to the field of light absorption technology, and particularly relates to a frequency-domain selective light absorption electro-optic modulation device, which includes a substrate, a metal mirror layer, a nonlinear dielectric layer, and a light absorption superstructure layer. The metal mirror layer is disposed on the substrate, the nonlinear dielectric layer is disposed on the metal mirror layer, and the light absorption superstructure layer is disposed on the nonlinear dielectric layer. The light absorption superstructure layer includes periodically distributed light absorption superstructures. The light absorption superstructure layer forms a relatively wide absorption spectral band; the upper surfaces of the metal mirror layer and the nonlinear dielectric layer, and the upper surfaces of the metal mirror layer and the light absorption superstructure layer respectively form optical microcavities to form narrow-band absorption. By applying an electric field on both sides of the nonlinear dielectric layer, the resonance wavelengths of the two optical microcavities are changed, thereby forming tunable narrow-band absorption. In the present invention, the light absorption superstructure layer is not only used to achieve wide-band absorption, but also serves as the interface of the optical microcavity for narrow-band absorption, improving the system integration degree.