140 results about "Optical field" patented technology

The invention discloses a far-field light field simulation test system for a laser communication terminal. The far-field light field simulation test system comprises a primary mirror assembly, a secondary mirror assembly, a turning mirror assembly, a rod assembly, a focal plane assembly and a frame, the focal plane assembly is composed of a reflector, a spectroscope, a transmitting optical fiber, a receiving optical fiber, a light beam quality analyzer and a coated dichroic mirror. The far-field simulation test system is an off-axis reflection type optical system developed based on the geometrical optics theory. The test system is a core component applied to ground demonstration and verification of space laser communication, serves as a collimator for optical system installation and calibration of a terminal on one hand, provides a complete machine test platform for the space laser communication terminal on the other hand, can serve as a transmitting end to provide a parallel light source and can also serve as a receiving end, and the space laser communication terminal is convenient to use. The detected laser communication terminal is detected, and optical parameters of light beam quality and transmission efficiency of the detected laser communication terminal are effectively evaluated.

The invention relates to a focusing regulation and control method and device based on a vortex structure light field penetrating through a large-scale scattering medium, and the method specifically comprises the steps: generating a collimated and expanded laser beam through a laser, carrying out the phase modulation of the laser beam through a spatial light modulator, and collecting a transmission speckle image related to the scattering medium through the combination of an sCMOS camera; and obtaining an optimal phase according to a focusing index quantity fed back by a focusing area by combining a genetic neural network algorithm with the vortex structure light field, and realizing speckle focusing through multiple iterations. Compared with the prior art, a vortex structure light field method is introduced to improve the feedback focusing regulation and control effect, the problem that a traditional feedback modulation algorithm cannot focus a large-scale scattering medium is solved, and the focusing intensity is remarkably superior to that of a lens focusing method and a wavefront shaping focusing method based on Gaussian beams.

The invention discloses a controllable adjustment method and system for the motion state of a space optical soliton, and belongs to the field of optics, and the method comprises the steps: carrying out the periodic modulation of a transverse refractive index and a nonlinear coefficient in an optical lattice; constructing a nonlinear Schrodinger equation for describing light beam transmission characteristics based on the periodically modulated optical lattice; solving the nonlinear Schrodinger equation by using an equivalent particle method to obtain an optical soliton center position; and based on the center position of the optical soliton, the controllable adjustment of the motion state of the space optical soliton is completed through numerical simulation verification. According to the method, the transverse refractive index and the nonlinear coefficient are periodically modulated through the optical lattice, a new nonlinear Schrodinger equation is deduced and obtained, the nonlinear Schrodinger equation is solved through an equivalent particle method, several states of transmission of optical solitons in the optical lattice are analyzed, the correctness of the equation is verified through numerical values, and the nonlinear Schrodinger equation is obtained. The problem of motion trail control when optical solitons are transmitted in optical lattices is solved.

Aspects of the subject disclosure may include, for example, deriving substantially orthogonal optical fields from an output of an optical source, implementing a delay on one of the substantially orthogonal optical fields, resulting in time delayed optical fields, performing coherent detection of the time-delayed optical fields, resolving electrical field signals based on the coherent detection, and causing the electrical field signals to be processed so as to estimate a property of the optical source, wherein estimation of the property facilitates disturbance detection and localization. Other embodiments are disclosed.

An apparatus and method for realizing photon pair emission and fiber output on the basis of quantum dots. The apparatus comprises: a single quantum dot (1), which is used for generating cascaded luminescence of single excitons and biexcitons, wherein an exciton state exhibits luminescence in two polarization states, i.e. H and V, and the two polarization states have an energy splitting; a microcavity (2), which is formed by a first Bragg reflector (3) and a second Bragg reflector (4), and is used for controlling the directional light emission of the single quantum dot (1); an optical fiber coupling component (6), which is prepared by means of vertically bonding a single-mode optical fiber (5) and encapsulated by means of curing, and is used for collecting the cascaded luminescence of single excitons and biexcitons generated by the single quantum dot (1); a local electric field, which is generated by a single dopant atom (22) in an adjacent modulation-doped layer (21), and is used for tuning the single quantum dot (1), so as to reduce exciton energy splitting and tune an exciton wave function; a luminescence output module, which is used for performing fluorescence collection on the single quantum dot (1) and outputting the collected cascaded luminescence of single excitons and biexcitons in the form of a Gaussian optical field; and a photon pair correlation test unit (11), which is used for filtering the cascaded luminescence of single excitons and biexcitons, and testing polarization correlation on the basis of filtered single excitons and biexcitons.

The invention discloses a dynamic light field regulation and control method based on a ferroelectric topological domain structure, and the method comprises the steps: selecting the ferroelectric topological domain structure formed in a ferroelectric film material as a light field regulation and control medium, and the ferroelectric topological domain structure is provided with dipole arrangement in spatial distribution; the ferroelectric topological domain structure is used for carrying out linear or nonlinear conversion on a light field of incident fundamental waves to generate a vortex light field or a vector light field, and domain distribution and dipole arrangement of the ferroelectric topological domain structure are adjusted in real time through external field driving modes such as a thermal field, an electric field or a pulse light field. And dynamically changing the phase, the amplitude and the polarization state of the vortex light field or the vector light field to realize real-time correlation response of the light field parameters and the topological domain structure. According to the method, the topological domain structure in the ferroelectric material is utilized, multi-dimensional regulation and control of the light field are achieved through rich dipole arrangement, and the method can also be applied to the fields of high-integration photonic circuits and reconfigurable high-capacity optical communication.

The invention relates to the technical field of lasers, and discloses a multi-junction vertical cavity surface emitting laser and a preparation method thereof. The laser comprises a substrate layer, an epitaxial structure, a first oxide layer and a second oxide layer, wherein the epitaxial structure comprises a first reflector layer, an active layer comprising a plurality of barrier layers and tunnel junctions, and a second reflector layer; the first oxidation layer with a first oxidation hole is arranged on one side of the tunnel junction, the second oxidation layer is arranged on the other side of the tunnel junction and is provided with a second oxidation hole concentric with the first oxidation hole, and the oxidation depth of the first oxidation layer is larger than that of the second oxidation layer; and one tunnel junction, the first oxide layer and the second oxide layer form an integrated structure which is arranged in one trough of the standing wave field. An optical field limiting structure in which oxide layers with long upper parts and short lower parts are arranged on two sides of a tunnel junction is formed, so that more high-order optical modes in the resonant cavity are ensured, transverse current can be effectively limited, increasing of series resistance and shortening of the effective cavity length of a standing wave field can be avoided, and the photoelectric conversion efficiency is further improved.

The invention relates to a high-order transverse mode compression state preparation device based on optical parameter resonant cavity mode selection, and belongs to the technical field of quantum state light field generation. Fundamental frequency light and pump light output by the laser source generate a high-order transverse mode light field through the mode conversion module, and then the high-order transverse mode light field enters the optical parametric resonant cavity to be subjected to parametric down-conversion with the nonlinear crystal. The cavity length of the optical parametric resonant cavity is locked at the optimal pumping mode position corresponding to the high-order transverse mode compression state, so that resonance of an impurity mode in the optical parametric resonant cavity can be avoided, and the compression level of a high-order transverse mode light field is improved. Under injection of high-order transverse mode pump light, the pump mode is purified through the optical parametric resonant cavity of the annular structure, the compression level of a high-order transverse mode light field is enhanced, adjustment is easy, practicability is high, productization is easy, and wide application prospects are achieved in the fields of quantum space measurement, biological measurement, atomic force microscope detection and the like.

The invention provides an achromatic superlens design method and device, and the method comprises the steps: carrying out the light field simulation of a target metasurface, and obtaining a simulation light field; the target metasurface is a plane where the pattern of the super lens is located; performing iterative optimization on the target metasurface according to the simulation light field and a preset target function, and taking the metasurface corresponding to the minimum preset target function as a final design pattern of the achromatic superlens; the preset objective function is irrelevant to the light wavelength and is used for representing the deviation between the simulation light field and the ideal light field; the ideal light field is related to the polar angle of the target metasurface in space, it is ensured that the super lens can achieve the characteristic that the focal length is not changed under different wavelengths, the high-quality achromatic effect is achieved, and the design efficiency and precision of the super lens are improved.

An optical computing topology structure configured to implement large-scale adjustment of a topology structure for different application scenarios. The optical computing topology structure includes a first physical medium, a spatial light modulator, and a second physical medium. The first physical medium, the spatial light modulator, and the second physical medium are sequentially connected. The first physical medium is configured to mix an input optical field, to implement a fully connected topology of the input optical field, to obtain a to-be-modulated optical field. The spatial light modulator is configured to modulate an optical field parameter of the to-be-modulated optical field to obtain a to-be-output optical field. The second physical medium is configured to mix the to-be-output optical field, to implement a fully connected topology of the to-be-output optical field, to obtain an output optical field.

This invention relates to information technology. The purpose of this invention is to solve the problem of inaccurate measurement of time delay mismatch in current chaotic modular link systems. It provides a chaotic modular link delay testing system and method, the technical solution of which can be summarized as follows: A continuous laser is used as a test carrier, and this test carrier is split into two beams, one outputting to the chaotic modular link system under test; the other test carrier is mixed with the output of the chaotic decryption device of the chaotic modular link system under test at a 90° angle to achieve coherent detection with zero difference, obtaining a mixed optical field; the mixed optical field is then converted by photoelectric conversion to output a Q-component signal; the input Q-component signal is sampled at high speed, and a phase mismatch term is calculated; an autocorrelation operation is performed on the phase mismatch term to obtain a correlation curve; and the time delay corresponding to the second peak is calculated based on the correlation curve to obtain the measured time delay mismatch Δt. The beneficial effect of this invention is that it can quickly and accurately calculate the measured time delay mismatch Δt, and it is applicable to chaotic modular link systems.

A giant cavity surface-emitting laser includes a giant cavity, a lower Bragg reflector, and an upper Bragg reflector. The giant cavity includes a multi-junction active region containing at least two active layers, and the giant cavity includes at least one of: an anti-reflection light reservoir located between the multi-junction active region and the lower Bragg reflector or an anti-reflection light reservoir located between the multi-junction active region and the upper Bragg reflector, where the anti-reflection light reservoir is configured to increase an optical field intensity peak of the anti-reflection light reservoir to a value higher than an optical field intensity peak of the multi-junction active region and store optical field energy, and a current confinement layer defining a light-emitting region is disposed within the multi-junction active region or near the outer side of the multi-junction active region.

The application relates to the technical field of optical communication, and particularly discloses a photon orbital angular momentum mode order multiple transformation device, which comprises an optical coordinate transformation module, an optical 4f low-pass filter module and a reflection module; the optical coordinate transformation module comprises a first phase part and a second phase part with an optical field phase modulation function; a vortex optical field carrying photon orbital angular momentum is emitted from the first phase part, the vortex optical field is transmitted to the reflection module after spiral decomposition and phase modulation of the first phase part, and then is transmitted to the second phase part; the second phase part changes the phase distribution from an angular spiral phase into an angular scaled spiral phase, and then outputs ideal vortex light through the optical 4f low-pass filter module; the photon orbital angular momentum mode order multiple transformation device realizes mode transformation of various multiples, greatly improves the efficiency of mode multiple transformation and the purity after change, and can be widely applied to the field of optical field regulation.

The invention relates to the technical field of micro-nano optics, in particular to a light field switching and characterization method and system. According to the light field switching and characterization method provided by the invention, rapid switching between a tightly focused light field and a surface plasmon polariton field can be realized through the process of moving the focus of the exciting light and controlling the focusing degree of the exciting light, and when parameters of incident light are changed, the switching device is still applicable and has relatively high reusability. According to the method, the optical retardation between pump light and exciting light is adjusted, so that the pump light and the exciting light are focused to the same position on a substrate at the same time, a partial degenerate four-wave mixing effect is generated, and nonlinear signal light is generated; and the non-linear signal light is represented through an imaging technology. The four-wave mixing effect is caused by a third-order nonlinear effect, and the effect almost occurs in all crystal materials. Therefore, the effect can be almost used for detecting the surface of any sample, and the reusability is high.

The invention provides a system and method for enhancing the spectrum demodulation rate of a dual-optical-frequency comb, and the system comprises a circulation light path which carries out the light splitting of excitation pulse light which is inputted to the circulation light path and corresponds to a first repetition frequency, thereby enabling one part of the excitation pulse light to be outputted towards a unit to be detected, and enabling the other part of the excitation pulse light to circulate along the circulation light path; the to-be-tested unit is used for modulating the excitation pulse light and outputting processing signal light carrying dynamic spectrum information generated based on an actual dynamic spectrum of the to-be-tested unit; the light combining unit is used for coupling the processing signal light and the sampling pulse light and outputting coupled signal light; the photoelectric detector performs light field cross-correlation-based detection on the coupled signal light and outputs a periodic electric signal; and the data acquisition and processing unit processes the periodic electric signal to obtain an actual dynamic spectrum corresponding to the unit to be detected. The detection efficiency is at least improved.

This invention discloses a tunable nanoantenna and its fabrication method, belonging to the field of nanoantenna technology. The tunable nanoantenna comprises, from top to bottom: an ordered metal mesh nanoelectrode layer, Fe... 3 O 4 The invention comprises a magnetic nanosphere layer, a silicon nanopillar micro / nanostructure layer, a substrate layer, and a lower electrode layer. This invention proposes a tunable nanoantenna and its fabrication method. Specifically, this invention combines silicon nanopillars with Fe... 3 O 4 By combining magnetic nanospheres and utilizing their synergistic effect, a composite nanoantenna with magnetic response and optical resonance characteristics can be constructed. This not only breaks through the limitations of single-material control, but also enables more flexible performance control through the dual effects of magnetic and optical fields.

The invention provides a light field quantum state regulation and control method and device based on solid higher harmonic generation conditions, and relates to the technical field of quantum optics. The laser wavelength of the driving laser and the harmonic order of the solid higher harmonic are controlled according to the control variable strategy, and higher harmonics of different quantum states are obtained; performing quantization conversion processing on higher harmonics of different quantum states to obtain a plurality of Wigner functions used for representing light field quantum state description; and performing function feature analysis on the Wigner function to obtain a light field quantum state regulation and control result including an optical modem state and a coherent state. The invention is used for solving the technical problem that the quantum state of the light field is difficult to directionally regulate and control by using the generation condition of the solid higher harmonic in the prior art.

The application discloses an acceleration measurement method and device based on optical suspended microparticle centroid motion quantum state, which utilizes optical tweezers to trap a four-level atom and a nanometer microparticle in an optical cavity simultaneously, the optical cavity is driven by driving laser LC, a stable cavity optical field, i.e., cavity mode, is excited and formed in the cavity; the cavity optical field is coupled with the internal energy level transition of the atom and the centroid motion of the nanometer microparticle simultaneously, and three control lasers LES, LER and LGR are used to drive three energy level transition processes of the atom; by controlling the three control lasers LES, LER and LGR, a rapid adiabatic process and an atomic state inversion process are realized; wherein, in the process of preparing the centroid motion of the nanometer microparticle to a target Fock state, the forward rapid adiabatic process and the atomic state inversion process are iteratively executed in sequence; in the acceleration measurement process, the reverse rapid adiabatic process, the atomic state inversion process and the population transfer process based on a pi pulse are comprehensively utilized. The application can further improve the measurement sensitivity.

According to the gallium nitride-based semiconductor laser with the gradually-changed polarized optical phonon energy waveguide layer, a fitting curve of In ion strength distribution or In atom concentration distribution of an upper waveguide layer and a lower waveguide layer is tested through SIMS, and a fitting curve of polarized optical phonon energy distribution meets any function distribution of Log3P1, Lop2P2 and Biphase. The spatial continuous regulation and control of the phonon energy of the optical field are realized, so that the LO phonon energy is continuously and gradually changed along the propagation direction, the phonon energy gradient is formed, the LO phonon scattering is improved, the inelastic scattering and energy relaxation of carriers and LO phonons are inhibited, the carrier transportation and phonon scattering are optimized, the service life of the carriers and the gain retention time are prolonged, and the optical field performance is improved. According to the invention, the threshold current density is reduced, the thermal stability of the laser is improved, the use power and the use temperature of the laser are improved, meanwhile, the phonon energy valley value is matched with the quantum well gain peak, the scattering loss is inhibited, additional scattering caused by phonon energy mutation is avoided, the light field limitation is enhanced, and the slope efficiency is improved.

To provide a transmission line monitoring device and a transmission line monitoring method that estimate the characteristics of an optical transmission line using a relatively small number of symbols.SOLUTION: A transmission line monitoring device monitors the characteristics of an optical transmission line. The transmission line monitoring device includes a generation unit that generates predetermined information including optical power of an optical signal at multiple positions on the optical transmission line based on an electric field signal that indicates an optical electric field component of the optical signal received from the optical transmission line and a specific signal that indicates an electric field obtained by data demodulated based on the electric field signal, and an update unit that updates the predetermined information based on a first error between the electric field signal after linear distortion of the optical signal and nonlinear distortion of the optical signal are compensated for based on the predetermined information, and the specific signal, and a second error between a derivative of the optical power at the multiple positions and a reference value including a transmission loss of the optical transmission line.SELECTED DRAWING: Figure 6

This invention belongs to the field of optical computation and simulation technology, specifically a rotationally symmetric optical field modeling method based on FD-BPM in cylindrical coordinates. This invention uses Matlab as a platform to create models of optical elements, including setting the morphology, refractive index, wavelength, amplitude, and wavefront of the incident light field. Based on beam propagation and the finite difference method with boundary conditions, the near-field and far-field optical fields at arbitrary positions of the rotationally symmetric optical element are calculated. This method can obtain various optical information modulated by the optical element, including intensity and phase information at arbitrary positions in the near and far fields, thereby calculating transmittance, focusing efficiency, depth of focus, and focal spot size. This invention greatly improves the accuracy and computational efficiency of optical simulation, and can significantly shorten the development cycle and reduce experimental costs in the design and optimization of large-aperture, short-wavelength focusing optical elements.

The invention provides a gallium nitride-based semiconductor laser with a gradient radiation recombination coefficient waveguide layer, which is characterized in that a lower waveguide layer and an upper waveguide layer are respectively a gradient radiation recombination coefficient lower waveguide layer and a gradient radiation recombination coefficient upper waveguide layer; and a fitting curve of In ion strength distribution or In atom concentration distribution and a fitting curve of radiation recombination coefficient distribution of the waveguide layer on the gradient radiation recombination coefficient both meet any function distribution of GaussAmp, InvsPoly and Hill in an SIMS test. A fitting curve of In ion strength distribution or In atom concentration distribution and a fitting curve of radiation recombination coefficient distribution of the waveguide layer under the gradient radiation recombination coefficient both meet BiDoseResp function distribution in an SIMS test. According to the invention, carriers, quantum recombination and a light field are efficiently localized, the laser gain is improved, the carriers and the light field are efficiently localized in an active layer (quantum well), meanwhile, non-radiative recombination and absorption loss of a waveguide region are inhibited, and the threshold current, slope efficiency and reliability are further improved.

The invention belongs to the related technical field of optical information measurement, and discloses an optical field wavefront measurement module and method based on an integrated photon chip. The measurement module is arranged on the integrated photon chip and comprises a coupling unit, a transmission waveguide and a photoelectric detector, and the coupling unit is used for receiving wavefront to be measured and coupling the wavefront to be measured to the transmission waveguide; the periphery of the coupling unit is connected with transmission waveguides, the periphery comprises a transverse forward direction and a transverse reverse direction and a longitudinal forward direction and a longitudinal reverse direction, the tail end of each transmission waveguide is connected with a photoelectric detector, and the transmission waveguides are used for transmitting optical signals on the coupling unit to the photoelectric detectors; the photoelectric detector is used for measuring the light intensity of the optical signal from the transmission waveguide. According to the invention, high-resolution and high-dynamic-range wavefront measurement is realized.

This invention discloses a method for enhancing the uranium separation efficiency of commercial iron powder using an external field, comprising: adding commercial iron powder to a reactor containing fluorine- and uranium-containing wastewater; applying an external weak magnetic field or magneto-optical coupling; and performing uranium separation treatment on the fluorine- and uranium-containing wastewater under continuous stirring. This invention magnetizes the commercial iron powder by introducing a weak magnetic field, thereby attracting Fe... 2+ Migration disrupts the passivation layer on the surface of iron powder, promoting the reaction of U(VI) with Fe. 0 The redox reaction simultaneously strengthens the affinity between the magnetized iron powder particles and the paramagnetic O2 molecules, leading to the formation of γ-FeOOH nanosheets with a high specific surface area on the iron powder surface. The γ-FeOOH surface is rich in oxygen-containing functional groups, which achieve U(VI) separation through the bonding of -OH groups with U(VI). This invention, based on a weak magnetic field, further improves the separation efficiency of commercial iron powder for U(VI) in fluoride- and uranium-containing wastewater by coupling with an optical field.

The invention relates to the technical field of electro-optical modulators, in particular to an inverted step capacitor load type traveling wave electrode lithium niobate electro-optical modulator which comprises a substrate, a buffer layer, an optical waveguide, a metal electrode, an isolation layer and a high-dielectric cladding. The metal electrode is an inverted step capacitance load type electrode which can effectively reduce electrical loss and obtain high bandwidth, the inverted step capacitance load type metal electrode enhances the effect on the optical waveguide and effectively improves the modulation efficiency on the aspect of photoelectric efficiency, and the high-dielectric cladding and the isolation layer change the electric field intensity distribution while reducing the optical loss, so that the modulation efficiency is improved. The electric field intensity in the waveguide is greatly improved, the overlapping between the electric field and the light field is enhanced, the modulation efficiency is further improved, the half-wave voltage length product of 0.99 V.cm is achieved under the light absorption loss of 0.25 dB / cm through the lithium niobate electro-optical modulator of the inverted-step capacitance load type traveling wave electrode, and important guiding significance is achieved for the design of the electro-optical modulator.

The application belongs to the technical field of sensor measurement, and discloses a spherical joint multi-degree-of-freedom attitude measurement system and method. The system comprises a magnetic field measurement module, an optical field measurement module and a calculation module, wherein: the magnetic field measurement module measures the change of the magnetic field when the moving end of the spherical joint moves relative to the fixed end; the optical field measurement module measures the change of the optical signal when the moving end of the spherical joint moves relative to the fixed end; and the calculation module is used for calculating the angle and the angular velocity of the moving end of the spherical joint relative to the fixed end at the current moment according to the change of the magnetic field measured by the magnetic field measurement module and the change of the optical signal measured by the optical field measurement module respectively, and then fusing the angle and the angular velocity at the current moment to obtain the angle of rotation of the moving end of the spherical joint relative to the fixed end at the next moment. Through the application, the advantages are complementary, and the precision and the robustness of the measurement system are improved.

The present application relates to the technical field of terahertz pulse generation of optoelectronics, and discloses a terahertz field generation method based on two-color field phase locking, comprising: through optical system building, using a beam expander to amplify the fringe spot in the optical path. The frequency map and phase map of the amplified spot are obtained, and the periodic frequency point is extracted. The phase change information of the periodic frequency point is analyzed, compared with the expected phase change threshold, and it is judged whether the position of the piezoelectric ceramic needs to be adjusted. If the phase change information is within the threshold range, it is determined that no adjustment is needed; otherwise, the position of the piezoelectric ceramic is adjusted and moved. Through accurate control of the phase of the optical field, the stability of the pulse is improved, the overall structure is simplified, and the cost of the terahertz magnetic field generation is reduced.

The invention belongs to the technical field of rotating speed measurement, aims to solve the problems that a tachometer in a traditional electromagnetic pulse principle form is easily interfered by strong electromagnetic interference and metal burrs, and a pulse intensity threshold value is interfered by empirical human factors, and discloses a tachometer based on optics and a measurement method thereof. The tachometer comprises a laser transmitter, an optical signal receiving device and a photoelectric signal conversion assembly, the optical signal receiving device and the photoelectric signal conversion assembly are connected through an optical fiber, the laser transmitter is arranged below the optical signal receiving device, and the laser transmitter is arranged towards a gear and continuously emits laser to the surface of the gear; according to the method, the tachometer is used for rotating speed measurement. The number of the concave and convex parts of the gear is judged through the optical signal assembly, the optical signal receiving device adopts black to shield stray light interference in other directions, off-field interference can be effectively restrained, and the uniqueness of an optical path can also solve interference hindered by irregular objects in an optical field.

The invention provides a flexible visible light detector based on light field coupling regulation and a preparation method and application thereof. The flexible visible light detector comprises a flexible substrate layer, a distributed Bragg reflection layer, a current expansion layer, an N-type electrode layer, an N-type diffusion layer, an InGaN / GaN multi-quantum well layer, a P-type diffusion layer and a P-type electrode layer which are sequentially arranged from bottom to top. And the silver nanoparticle layer is positioned on the upper surface of the P-type diffusion layer. Through the design of the periodic InGaN / GaN quantum well structure, the Bragg reflection layer and the silver metal nanoparticle layer, the light responsivity and the light response speed of the visible light detector are improved, so that the visible light detector meets the requirements of a next-generation visible light communication system and the requirements of application scenes such as flexible wearing.

This application relates to a multi-plane optical conversion device and its design method, comprising: a phase modulation component, an optical path reflection component, and a beam splitter component. The phase modulation component includes N phase planes, where N≥1. The optical path reflection component is disposed on the optical propagation path of the phase modulation component and located at the end of the optical propagation path of the phase planes. The beam splitter component is disposed at the beginning of the optical propagation path of the phase modulation component. The device is configured to form a folded optical path, such that incident light enters through the beam splitter component, passes through the phase modulation component along a first propagation direction to reach the optical path reflection component, is reflected by the optical path reflection component, passes through the phase modulation component again along a second propagation direction, and is output by the beam splitter component. Each phase plane has the same physical phase profile in both the first and second propagation directions. This invention reduces the actual number of stacked physical phase planes while achieving the same optical field modulation effect.