140 results about "Reflection loss" patented technology

The invention discloses a broadband wave-absorbing material based on an MAX-phase metasurface structure and an impedance matching optimization method of the broadband wave-absorbing material. The wave-absorbing material comprises an MAX-phase ceramic substrate and periodic metasurface structures which are arranged on the surface of the MAX-phase ceramic substrate in an array mode and composed of conductive resonance units. The resonance units are isolated through gaps, an equivalent R1L1C1 series resonance circuit is formed in an electromagnetic field, and a base body is equivalent to a parallel resistor R2. By establishing an equivalent circuit model and optimizing parameters R1, L1, C1 and R2, impedance matching of the wave-absorbing material in a target frequency band can be regulated and controlled, so that the wave-absorbing material at least has an absorption peak of which the reflection loss is less than-10 dB. According to the optimization method, electromagnetic simulation and circuit simulation are combined, optimized circuit parameters are reversely mapped into structure geometric parameters, material preparation is guided, and accurate design and broadband absorption of the wave absorbing performance are achieved.

The invention discloses an electric vehicle wireless charging system and an optimization method thereof. The electric vehicle wireless charging system comprises a transmitting end optimization module, a receiving end optimization module, a dynamic matching control module and an intelligent charging management module. The transmitting end optimization module is used for reducing magnetic field leakage in the energy transmission process through magnetic field focusing; the receiving end optimization module is used for detecting relative position deviation of the transmitting end and the receiving end and reducing external magnetic field interference; the dynamic matching control module is used for matching the impedance of the transmitting end and the receiving end in real time to reduce reflection loss; and the intelligent charging management module is used for implementing a segmented charging strategy according to the battery state and executing safety protection. By applying the technical scheme of the invention, the problems of high reflection loss caused by serious magnetic field leakage and impedance mismatch and low overall charging efficiency caused by lack of intelligent charging control in the existing wireless charging system of the electric vehicle can be solved.

This invention relates to a method for measuring the dielectric constant of fibers. The method includes the following steps: First, composite material and pure matrix samples are prepared, and the reflection loss curve of the composite material and the complex dielectric constant of the matrix are measured in the 1-18 GHz frequency band. Second, a realistic three-dimensional microstructure model of the composite material is reconstructed using micro-CT scanning. Then, an electromagnetic simulation model is established based on this model, and an initial complex dielectric constant is assigned to the fiber for simulation to obtain the simulated S11 parameter. Finally, by iteratively adjusting the complex dielectric constant of the fiber, the root mean square error between the simulated S11 curve and the measured reflection loss curve is minimized, thereby retrieving the actual complex dielectric constant of the fiber. This invention avoids theoretical model errors, directly correlates the macroscopic properties and microscopic parameters of materials, and has the advantages of high accuracy and wide applicability, providing a reliable parameter acquisition method for the design and optimization of the electromagnetic properties of composite materials.

The invention relates to the technical field of communication, discloses a dynamic impedance matching method and system for a radio frequency switch and an attenuator, and aims to solve the technical problems that signal reflection is increased, insertion loss is increased and system performance is reduced due to the fact that a traditional fixed impedance matching network cannot adapt to port impedance change during state switching of the radio frequency switch and the attenuator. The method comprises the following steps: monitoring control signal changes of a radio frequency switch and an attenuator in real time, and generating a state identification code representing a current working state; and taking the identification code as an index, and retrieving a corresponding optimal tunable network control parameter from a pre-stored calibration parameter lookup table. By means of the scheme, rapid and accurate impedance matching can be achieved under all working state combinations, reflection loss and insertion loss are remarkably reduced, signal integrity and linearity are improved, and the overall performance and environmental adaptability of the system under broadband and multi-state application are improved.

This invention provides an infrared thermal imaging method, relating to the field of infrared thermal imaging technology. The method utilizes a germanium infrared lens in an infrared thermal imaging system, whose surface is sequentially composed of subwavelength micro / nano structures and an anti-reflection film structure from the inside out. The infrared thermal imaging method includes: focusing target infrared radiation through the germanium infrared lens onto an infrared detection array; the infrared detection array converting the target infrared radiation into an electrical signal matrix; performing noise reduction and gain correction on the electrical signal matrix to obtain a preprocessed electrical signal matrix; performing temperature compensation on the preprocessed electrical signal matrix based on a temperature compensation formula and a transmittance temperature model to obtain a corrected signal matrix; and sequentially performing non-uniformity correction, image enhancement, and pseudo-color mapping on the corrected signal matrix before outputting and displaying the result. Using the method of this invention, higher transmittance, lower reflection loss, and more stable thermal imaging can be achieved.

The application discloses a terahertz metasurface reflection unit based on a MEMS switchable delay line, and belongs to the field of radio frequency front-end devices.The unit adopts a sandwich structure of upper and lower glass substrates and a middle bonded metal surface, and a metal radiation patch, a phase delay line and a MEMS switch are integrated on the upper surface.The core is to control the on-off state of the phase delay line through the MEMS switch: when the switch is turned off, the unit is in a reference electrical length;when the switch is turned on, the current path is lengthened, so that the reflection phase lags by about 180 degrees, thereby realizing 1-bit phase coding.The design ingeniously combines the MEMS switch and the delay line, has the advantages of low driving voltage, low reflection loss and high phase control precision in the terahertz frequency band, and provides a feasible hardware solution for the practical application of a reconfigurable intelligent surface in a terahertz communication system.

The invention discloses a lumped element and acoustic resonator mixed filtering balun and radio frequency front end system, which comprises a first module, a second module, a third module, a fourth module, a fifth module, a sixth module and a seventh module, and is characterized in that the first module, the third module and the fourth module are acoustic-electric mixed modules and comprise lumped elements and acoustic resonators; the first module, the fifth module, the sixth module and the seventh module are used for forming a plurality of transmission zero points outside a passband of the filtering balun so as to enhance the selectivity and out-of-band rejection of the edge of the passband, and the second module, the fifth module, the sixth module and the seventh module are electric modules, are formed by lumped elements and are used for realizing the passband of the required filtering balun. Reflection loss caused by impedance mismatching when discrete devices are cascaded can be avoided, insertion loss of a system is remarkably reduced, the size and cost of the system are reduced, the broadband advantage of an electrical filter and the high selectivity advantage of an acoustic filter are integrated, and meanwhile the high-performance filtering balun which is miniaturized, large in bandwidth and high in selectivity is achieved.

The embodiment of the application provides a kind of based on integrating sphere light source's photosensitive diode multispectral calibration device and method, for by dark current measurement, photocurrent correction and wavelength response fitting, photosensitive diode array is carried out wide band multispectral calibration.The device of the application includes integrating sphere device, multi-band adjustable light source module, the photosensitive diode array to be calibrated and control and analysis unit;The inner wall of integrating sphere device is high reflectivity diffuse reflection material;Integrating sphere device further includes trap detector, and trap detector is used for real-time monitoring the reflection loss of the inner wall of integrating sphere device;Trap detector is connected with control and analysis unit communication;Multi-band adjustable light source module is accessed integrating sphere device;The photosensitive diode array to be calibrated is composed of multiple photosensitive diodes;Control and analysis unit and multi-band adjustable light source module, the photosensitive diode array to be calibrated establish communication connection.

The application relates to the technical field of LEDs, in particular to a reverse polarity LED epitaxial wafer capable of improving light extraction efficiency and a preparation method thereof. The reverse polarity LED epitaxial wafer comprises, from bottom to top, a GaAs substrate, a buffer layer, an etching stop layer, an N-type ohmic contact layer, an electrode protection layer, a roughening layer, a first refractive index gradient layer, an N-type confinement layer, a second refractive index gradient layer, an N-side waveguide layer, a multiple quantum well light-emitting layer, a P-side waveguide layer, a third refractive index gradient layer, a P-type confinement layer, a transition layer and a high-smoothness GaP mirror layer. The application proposes the design of the refractive index gradient layer and the high-smoothness GaP mirror layer, which can not only reduce the internal reflection loss caused by the refractive index mutation of the pre-reaction compound, but also prepare GaP material with a low-roughness surface, so that the light extraction efficiency of the reverse polarity LED is improved in both directions.

The present invention relates to the technical field of plastics, and provides a plastic, a housing and a preparation method therefor and a use thereof. The plastic comprises the following components in parts by weight: 60-80 parts of a plastic matrix, 10-20 parts of a reinforcing fiber, 5-10 parts of a conductive filler, 5-10 parts of a magnetic filler, and 0.5-2 parts of a coupling agent. The conductive filler and the magnetic filler are added into the plastic of the present invention, and the plastic can achieve broadband electromagnetic shielding performance by means of the synergistic effect of the dual mechanisms of reflecting high-frequency electromagnetic waves and absorbing low-frequency magnetic fields by means of reflection loss and hysteresis loss, respectively. Therefore, the present invention can mitigate the problem of a weak electromagnetic shielding effect existing in a plastic-based electrical appliance housing.

This invention relates to an end-face coupling structure for a low-loss silicon photonic chip, comprising a silicon substrate, a laser mounting region on the silicon substrate, a buried oxide layer on one side of the laser mounting region and on the silicon substrate, a shallow etched region on the buried oxide layer, and a beveled end face etched on the cross section formed by the buried oxide layer and the shallow etched region. The beveled end face is used to reduce reflection loss. A ridge waveguide facing the laser mounting region is disposed on the shallow etched region, and the incident end of the ridge waveguide is located at the beveled end face. This invention can achieve high coupling efficiency and alignment tolerance.

The application is suitable for the technical field of photovoltaic modules, and provides an optical polymer, an application method, a cell, a photovoltaic module and a photovoltaic system.The optical polymer comprises, by weight, 20-50 parts of a photocuring oligomer, 30-60 parts of a photocuring monomer, 20-70 parts of high-refractive nanoparticles, 0.5-10 parts of a nanodispersion agent, 1-10 parts of a photoinitiator system and 0.1-5 parts of an auxiliary agent.The viscosity of the optical polymer is 8-25 mPa·s at a temperature of 40-60 degrees Celsius, and the refractive index of a cured film formed after curing of the optical polymer is 1.60-1.75 at a wavelength of 600 nm.Due to the synergistic effect of the specific sulfur-containing or high-refractive monomer and the surface-modified nanoparticles used in the optical polymer, the refractive index of the cured film formed after curing is 1.60-1.75 under irradiation at a wavelength of 600 nm, thus effectively matching the refractive index difference between the encapsulation adhesive film and the cell antireflection film, reducing the interface reflection loss, optimizing the light transmission, reducing the reflection loss at the interface between the encapsulation adhesive film and the cell antireflection film, and thus improving the efficiency of the photovoltaic module.

This invention discloses a Ka-band focusing array dielectric lens based on impedance matching, comprising several dielectric lens units. Each dielectric lens unit has a three-layer dielectric structure, consisting of a front dielectric substrate, a middle phase modulator, and a rear dielectric substrate, arranged according to the electromagnetic wave incident direction. The dielectric constants of the three dielectric layers are set according to preset conditions. The thicknesses of the front and rear dielectric substrates are set based on the wavelength of the electromagnetic wave in their respective media. The thickness of the middle phase modulator is calculated based on the compensation phase of the lens unit. This invention reduces interface reflection loss by adjusting the thickness of the front and rear dielectric substrates and achieves phase compensation for different dielectric lens units by adjusting the thickness of the middle phase modulator, thereby improving the electromagnetic wave focusing performance.

The application provides a design method of a wave-absorbing material based on fractal geometry, the wave-absorbing material is composed of a periodic arrangement of a three-dimensional unit cell structure in a plane, and the unit cell structure is a layered structure; the method comprises the following steps: determining impedance gradient correction coefficients of each layer of the unit cell structure according to layer structure parameters and a fractal dimension of the unit cell structure of the wave-absorbing material; determining equivalent electromagnetic parameters of each layer of the unit cell structure according to intrinsic electromagnetic parameters and layer structure parameters of each layer; determining complex propagation constants and intrinsic impedances of each layer of the unit cell structure by using the equivalent electromagnetic parameters and a working frequency; determining an input impedance of a surface layer of the unit cell structure by using the impedance gradient correction coefficients, the complex propagation constants, the intrinsic impedances and the layer structure parameters of each layer of the unit cell structure, and then determining surface reflectivity and reflection loss; determining whether the wave-absorbing material meets working frequency band index requirements, and if not, continuously optimizing the unit cell structure until the unit cell structure meets the working frequency band index requirements, and completing the design of the wave-absorbing material.

The invention provides a carbazole-containing compound and an organic electroluminescent device thereof, and particularly relates to the technical field of organic electroluminescent materials. The compound provided by the invention is applied to the organic electroluminescent device as a covering layer material, so that the total reflection loss and waveguide loss in the device can be effectively reduced, the driving voltage is reduced, the luminous efficiency of the device is effectively improved, and the service life of the device is effectively prolonged; when the material is used as a host material, energy can be efficiently transferred to a doped light-emitting object, and the material has an appropriate triplet state energy level, so that a device has excellent performance; when the material is used as a hole transport layer material, the hole injection efficiency can be improved by high hole mobility, so that the luminous efficiency of a device is improved and the service life of the device is prolonged. In conclusion, the carbazole-containing compound provided by the invention can be widely applied to the fields of panel display and the like, and has good development potential and application prospect.

The present disclosure provides a tandem solar cell device and a manufacturing method thereof, which may secure the stability of the electrical / mechanical connection between the top cell and the bottom cell while sufficiently using the excellent characteristics of a tandem solar cell and enabling the omission of the recombination layer, maximize the process efficiency and economic feasibility due to the omission of an intermediate layer, and prevent optical losses such as reflection loss or parasitic absorption caused by the recombination layer, thereby significantly improving the photovoltaic efficiency.

The application provides an antenna cover and a radar device, comprising: a cover body, an included angle between a side wall of the cover body and an opening surface of a bottom of the cover body is 25-35 degrees, and a cross section of the cover body is tapered along a direction away from the opening surface of the bottom; a recess structure has a plurality of groove units, the plurality of groove units are arranged in an array on an inner side wall of the cover body, and can cover a field of view range of an antenna chip to diverge a beam of the antenna chip. In this way, the groove units can reduce reflection loss of the beam of the antenna chip, and can also make the beam of the antenna chip diverge in the groove units, so that the beam emitted by the antenna chip from the antenna cover is widened, an incident angle of the beam of the antenna chip formed on the side wall of the cover body is small, a propagation path of the beam of the antenna chip inside the side wall of the cover body is short, energy loss is small, and thus the detection distance and the field of view angle of the radar device can be improved.

The application discloses a laser protection plate and a preparation method thereof. The provided laser protection plate comprises a reflection layer, a scattering layer, an absorption layer, a heat dissipation layer and a substrate layer which are sequentially stacked; wherein the reflection layer comprises a distributed Bragg reflection film formed by alternately depositing a high refractive index material and a low refractive index material; the material of the scattering layer comprises a first substrate and stearic acid-coated first scattering agents and stearic acid-coated second scattering agents dispersed in the first substrate; the material of the absorption layer comprises a second substrate and polyvinylpyrrolidone-modified composite nano-absorbing agents dispersed in the second substrate; the material of the heat dissipation layer comprises a third substrate and a heat dissipation agent modified by a dispersing agent dispersed in the third substrate; and the side surface of the substrate layer is provided with a microchannel structure. The laser protection plate provided by the application has a gradually changed refractive index matching between layers, and the interface reflection loss is reduced.

The invention provides a solar cell module, a preparation method thereof and a solar cell. The solar cell module comprises a substrate, a first electrode layer, a light absorption layer, a second electrode layer, a light conversion layer and a light reflection layer, the first electrode layer is located on one side of the substrate, the light absorption layer is located on one side, away from the substrate, of the first electrode layer, the second electrode layer is located on one side, away from the substrate, of the light absorption layer, and the light conversion layer is located on one side, away from the substrate, of the second electrode layer. In the direction away from the substrate, the light conversion layer comprises a first light conversion layer, a transition layer and a second light conversion layer which are sequentially stacked, the refractive indexes of the first light conversion layer, the transition layer and the second light conversion layer are sequentially decreased, the material of the first light conversion layer comprises a lower conversion material, and the material of the second light conversion layer comprises an upper conversion material; the light reflecting layer is located on one side of the light conversion layer away from the substrate. According to the invention, sudden change of refractive index is avoided, and total reflection loss between interfaces is reduced; and energy loss and mutual influence caused by contact between the light conversion layers are also avoided.

The utility model discloses a projection lens with a large image plane and a long focus. The projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a diaphragm, wherein the entrance surfaces of the first lens, the second lens, the third lens and the fourth lens are respectively provided with a first anti-reflection coating film, and the exit surfaces of the first lens, the second lens, the third lens and the fourth lens are respectively provided with a second anti-reflection coating film; thus, by arranging multiple layers of anti-reflection coating films on the entrance surfaces and the exit surfaces of the first lens, the second lens, the third lens and the fourth lens and adopting the design of alternately overlapping the front anti-reflection coating films and the rear anti-reflection coating films, the refractive indexes and the Abbe numbers of different lenses are optimized, the reflection loss of light on the surfaces of the lenses is remarkably reduced, and the light transmittance is improved. The light transmittance and the imaging quality of the system are improved; and the material of the first front anti-reflection coating film of the entrance surface has high hardness and wear resistance, so that the influence of dust, fingerprints and mechanical friction can be effectively resisted, and the service life of the lens is prolonged.

The invention relates to the technical field of electromagnetic shielding materials, and particularly discloses an aramid fiber-based multilayer composite film as well as a preparation method and application thereof. The composite film is designed in a multi-level gradient structure, and multiple loss mechanisms are generated in an electromagnetic field from top to bottom: NiFe and MoS2 / ANF realize initial electromagnetic wave energy absorption through eddy-current loss and magnetic hysteresis loss of NiFe and dielectric polarization relaxation of a MoS2 / ANF interface; agNPs forms a continuous conductive network by virtue of high conductivity, and a strong reflection effect is generated through ohmic loss to reflect part of electromagnetic waves back to an upper layer for continuous dissipation; the ANF / MWCNTs carry out secondary capture and reabsorption on transmission electromagnetic waves through the electron tunneling effect and the multi-interface scattering effect of the carbon nanotubes, an electromagnetic shielding behavior of absorption-reflection-reabsorption is formed, and the attenuation efficiency of the electromagnetic waves is remarkably improved through the synergistic effect of dielectric loss, magnetic loss and interface multi-reflection loss of the ANF / MWCNTs.

The invention discloses a display structure, belongs to the technical field of LED display, and mainly aims to reduce reflection loss of light in the display structure and improve display brightness. According to the main technical scheme, the display structure comprises a light-emitting layer, a wavelength conversion layer, a planarization layer and a first anti-reflection layer, wherein the wavelength conversion layer is arranged on the light-emitting side of the light-emitting layer and used for receiving light emitted by the light-emitting layer and conducting wavelength conversion on the light; the planarization layer covers the surface, far away from the light-emitting layer, of the wavelength conversion layer and is used for filling the concave-convex surface of the wavelength conversion layer and unifying the refractive index of a medium in the light emitting direction; the first anti-reflection layer is arranged on the side, away from the wavelength conversion layer, of the planarization layer, the refractive index of the first anti-reflection layer is between the refractive index of the planarization layer and the refractive index of the subsequent layer, and the first anti-reflection layer is used for reducing interface reflection loss by forming continuous refractive index transition.

The application relates to a wave-absorbing composite material, an environmental part for a radar, a radar and a preparation method, which comprises, in terms of mass fraction, 25-35% graphene modified basalt fibers, 5-10% rare earth oxide modified carbon nanotubes and 55-70% nylon PA11. The wave-absorbing composite material is prepared by adopting a nylon PA11 bio-based resin as a base material and adopting graphene modified basalt fibers and rare earth oxide modified carbon nanotubes for modification, and the wave-absorbing composite material has good wave-absorbing performance for 77GHZ millimeter waves and waves of other frequency bands, effectively improves a signal-to-noise ratio, and avoids occurrence of false positives and false negatives. Through experiments, a 2mm-thick radar support is subjected to a 77Ghz millimeter wave electromagnetic loss test by using a QAR method, the transmission loss is greater than or equal to 14dB, the reflection loss is greater than or equal to 6dB, and the wave-absorbing parameter indexes of the millimeter wave radar support are completely met.

The invention discloses a high-frequency wave-absorbing material as well as a preparation method and application thereof, and relates to the technical field of wave-absorbing materials, the high-frequency wave-absorbing material comprises the following raw material components in parts by weight: 55-65 parts of polyamide-6; 1 to 2 parts of modified multi-walled carbon nanotubes; 10 to 15 parts of modified carbon black; 8 to 12 parts of a toughening agent; 15 to 25 parts of glass fiber; 0.5 to 1 part of a lubricant; 0.5 to 1 part of an antioxidant; wherein the modified multi-wall carbon nano tube is a maleimide grafted multi-wall carbon nano tube; the modified carbon black is prepared by sequentially carrying out oxidation, silanization treatment and ionic liquid modification on carbon black, the iodine absorption value of the carbon black is 1000 mg / g to 1100 mg / g, and the oil absorption value of the carbon black is 480 mL / 100 g to 510 mL / 100 g; the reflection loss of the high-frequency wave-absorbing material in the frequency band of 76GHz to 81GHz is less than or equal to-4.9 dB, and the transmission loss is less than or equal to-25dB, so that the high-frequency wave-absorbing material is particularly suitable for preparing automobile millimeter wave radar parts in the frequency band of 76GHz to 81GHz.

The embodiment of the application relates to the technical fields of image processing and water quality detection, and provides a laser matrix bombardment water quality detection method and system based on a multi-pulse fusion algorithm, the method comprising: performing contour extraction on an image corresponding to a to-be-detected sample to obtain first contour information, extracting coordinate information corresponding to each pixel point in the first contour information, determining the coordinate information corresponding to each pixel point in the first contour information as position information corresponding to the to-be-detected sample to obtain first position information, reconstructing a preset laser matrix according to the first position information and a preset reflection loss rate threshold to obtain a first laser matrix, and performing water quality detection on the to-be-detected sample by using the first laser matrix according to a multi-pulse fusion algorithm to obtain a target detection result, the multi-pulse fusion algorithm comprising dynamic weight distribution based on a signal-to-noise ratio and spectrum information fusion, and the accuracy of water quality detection on the to-be-detected sample is improved.

The application relates to a ceramic wave-absorbing metamaterial and a preparation method thereof, which comprises at least three layers of ceramic base loss unit layers, ceramic base impedance regulation unit layers and metal mesh layers which are alternately stacked; the ceramic base loss unit layer comprises a ceramic matrix A and wave-absorbing agent A dispersed in the ceramic matrix A, wherein the wave-absorbing agent A is composed of a composite powder of nano silicon carbide with a particle size of 50-200 nm and a nickel-zinc ferrite ceramic powder; the ceramic base impedance regulation unit layer comprises a ceramic matrix B and wave-absorbing agent B dispersed in the ceramic matrix B, wherein the wave-absorbing agent B is composed of a composite powder of barium titanate with a particle size of 100-500 nm and tin oxide. The ceramic wave-absorbing metamaterial has a reflection loss of less than or equal to -10 dB in a 1-8 GHz frequency band, and a reflection loss of less than or equal to -25 dB in an 8-18 GHz frequency band.

The utility model relates to technical fields especially for a kind of electromagnetic noise shielding structure of unmanned plane, including main part, the inside fixed connection of main part has control assembly, the bottom fixed connection of main part has support assembly;The utility model is when reflection loss is carried out by using reflection electromagnetic wave pole, shielding material has the carrier of free movement in magnetic field, needs to have good conductivity, when absorption attenuation is carried out, shielding material has a large number of electric or magnetic dipole, needs to have high electromagnetic loss, high magnetic permeability and suitable dielectric constant, when multiple reflection attenuation is carried out, the porous structure in shielding material can greatly improve multiple reflection and multiple scattering times, to effectively promote shielding performance, utilize the electromagnetic shielding shell outside electromagnetic shielding box, further reduce the influence of external electromagnetic interference to internal circuit, utilize intelligent obstacle avoidance module to improve sensor technology, improve unmanned plane overall perception performance and security.

This disclosure relates to a photovoltaic module and a method for manufacturing the same, wherein the photovoltaic module includes: a panel glass (1); a back sheet glass (2) disposed opposite to the panel glass (1) along the thickness direction (z) of the photovoltaic module; a battery layer (3) disposed between the panel glass (1) and the back sheet glass (2); an anti-reflection layer (4) disposed on the surface of the panel glass (1) away from the battery layer (3) and configured to reduce the reflection loss of light entering the panel glass (1) from the air; and a spectral selection layer (6) disposed on the surface of the back sheet glass (2) away from the battery layer (3) and configured to selectively transmit or suppress light of different wavelengths.

This invention relates to an antireflection structure, fabrication method, and application of inverted conical nanopores on the surface of SiC thin films, belonging to the field of surface engineering technology for photoelectric detectors. Addressing the problems of short optical path length and high interface reflection loss in existing SiC thin-film ultraviolet photodetectors based on heterogeneous substrates due to limited film thickness, a periodic array of inverted conical nanopores is constructed on the SiC thin film surface. The etching depth is controlled within the film thickness and does not penetrate the entire film, preserving a continuous electrical transmission channel. This structure creates a continuously gradient equivalent refractive index layer on the surface, reducing the surface reflectivity in the 200–400 nm wavelength range. The inverted conical morphology causes large-angle scattering of incident light, increasing the optical path length of ultraviolet light within the confined film and improving absorption. The array is fabricated using patterned masking technology combined with dry etching, suitable for SiC thin-film MSM or PIN detectors, with an average reflectivity of 7.58%, significantly improving the photoelectric conversion efficiency of the device.

The optical path system comprises a red light, a green light, a beam splitter and a lens, and further comprises a special-shaped prism, the red light and the green light are separately arranged front and back, and the special-shaped prism comprises a first reflecting surface and a second reflecting surface; light rays emitted by the red light and light rays emitted by the green light can be gathered together after being reflected by the first reflecting surface and the second reflecting surface respectively and pass through the lens, and the light rays passing through the lens can be visible by human eyes after being reflected by the beam splitter. According to the light path system, the special-shaped prism is used for integration, after achromatism and collimation are conducted through the lens, the collimated light is reflected, compared with a solving method in the market, the light path system reduces one reflecting mirror besides solving the problems of dislocation, parallax and chromatic aberration of the two-color lamp, only one beam splitter is needed, and the cost is reduced. The reflection loss of light energy can be greatly reduced, the brightness of reflected light is increased, the service life of the power supply is indirectly prolonged, and the power consumption can be reduced under the condition of consistent brightness.