70 results about "Optical resonance" patented technology

The invention provides a prospecting model generation and prospecting method, device and system based on intrinsic characteristics, and belongs to the technical field of mineral resource exploration, and the method comprises the steps: obtaining vibration signals which are collected by an optical resonance type acousto-optic sensor and are fed back after vibration excitation is applied to mineral resources with different characteristics, and the characteristics comprise types, grades, structures and reserves; performing iterative training on an initial model by taking a machine learning algorithm as the initial model, taking the vibration signal as input and taking different features as output; and outputting the completely trained initial model as a final prospecting model. The technical problem that underground deep mineral resource information is difficult to accurately obtain in the prior art is effectively solved.

The invention provides a multi-junction cascade photonic crystal surface emitting laser and a preparation method thereof. The multi-junction cascade photonic crystal surface emitting laser comprises a substrate; the three-dimensional photonic crystal structure is arranged on the substrate, the three-dimensional photonic crystal structure comprises a longitudinal periodic structure formed by a plurality of laminated structures which are sequentially stacked in the vertical direction of the substrate, each laminated structure comprises an active layer and a photonic crystal layer, and the photonic crystal layer provides optical feedback for the active layer to form optical resonance; a transverse periodic structure is formed in each photonic crystal layer; and the plurality of tunnel junctions are arranged between the two adjacent laminated structures and are used for electrically connecting the two adjacent laminated structures.

The invention relates to a measurement system (10) of the MEMS and / or NEMs type comprising: a resonant assembly (RE) comprising a plurality of N indexed OMRi resonators i, at least one resonant mechanical element MEij coupled to each OMRi resonator, and at least one waveguide (WG) to which the optical resonators are coupled, an emission device (ED), an injection device (ID), each OMRi resonator of the resonant assembly being further configured to be excited at a mechanical excitation frequency (fex / o(i)) and to modulate the light beam associated with said first excitation frequency (fex / o(i)), a resonant mechanical element (MEij) being configured to be excited at a mechanical excitation frequency (fex / e(i,j)) and to modify an optical transmission or reflection in the vicinity of the optical resonance of said associated resonator, said modification being a function of a physical quantity (u) to be measured,at least one detector (Det) and a demodulation device (DDM) comprising a plurality of synchronous detection demodulation modules (11), referred to as LIA. Figure 11,

The invention provides an avalanche photodiode with asymmetric optical resonance and a photosensitive array, and the avalanche photodiode comprises an electrode layer which is internally provided with a first windowing region; the top reflecting mirror is arranged in the first windowing area, the transmittance of the incident side of the top reflecting mirror to the light with the target wavelength is higher than a preset transmittance threshold value, and the reflectivity of the emergent side of the top reflecting mirror to the light with the target wavelength is higher than a preset reflectivity threshold value; the substrate is arranged on the emergent side of the top reflecting mirror; the buffer layer is arranged on one side, deviating from the top reflecting mirror, of the substrate; the active region is arranged on the side, away from the top reflector, of the buffer layer; and a bottom high reflective metal film. The top reflector and the bottom high-reflectivity metal film form an asymmetric optical resonant structure, and the purposes of filtering and absorption enhancement are achieved. And the bottom high-reflection metal film is low in process difficulty and suitable for preparation of large-array devices.

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 application discloses a symmetrical split-bowl waveguide gas concentration sensor for waste battery disassembly, belongs to the technical field of optical sensing, and constructs a symmetrical split-bowl waveguide which is composed of two half-bowl resonant cavities. The symmetrical split-bowl waveguide can introduce multiple optical resonances, thereby forming multiple sharp Fano resonance peaks. When the resonant cavity is filled with a to-be-detected gas, the concentration of the to-be-detected gas can be obtained by measuring the moving amount of the Fano resonance peak. The application has small loss, high quality factor, small noise, high sensitivity and high integration degree, and can be applied to the fields of chemical detection and waste gas detection.

The invention discloses a blood flow signal processing method and device based on silicon-based photons and wearable device.The method comprises the steps that firstly, phase modulation is conducted on three emitted narrow-band lasers with different wavelengths, the modulation frequency is set to be 50-100 MHz, and the generated sideband frequency is set to be 50-100 MHz; receiving a reflection signal passing through a human body artery blood vessel target area, demodulating the reflection signal and a local oscillator signal in a frequency mixer, and extracting a PDH error signal; finally, the blood flow direction in the target area is judged according to the positive and negative values. According to the hemodynamic monitoring system based on the optical resonant cavity array and the PDH read-out technology, through the innovation of a physical mechanism (strength detection is replaced by frequency detection), the innovation of a spatial architecture (an array replaces a single point) and the breakthrough of an algorithm model (physical field decoupling and waveform separation), the detection accuracy is improved; the problems that a traditional non-invasive blood pressure monitoring technology is low in precision, poor in interference resistance and lack of deep pathological information are fundamentally solved.

The invention relates to the technical field of semiconductor display, and discloses a Micro-LED micro display chip and a manufacturing process thereof. A bonding metal layer is arranged at the top of the lower substrate; a metal reflector is arranged at the top of the bonding metal layer; a distributed Bragg reflector is arranged at the top of the metal reflector; a first indium tin oxide layer is laid on the top of the distributed Bragg reflector; an LED epitaxial assembly is arranged at the top of the first indium tin oxide layer; and a second indium tin oxide layer is laid on the other side of the LED epitaxial assembly. The middle parts of the metal reflector, the distributed Bragg reflector, the first indium tin oxide layer and the LED epitaxial assembly are respectively provided with an optical resonance region and an MESA region. By arranging the composite reflection structure and the LED epitaxial assembly to form an optical resonant cavity, light emission in the vertical direction is enhanced, and the light output power of the chip is remarkably improved; meanwhile, the passivation layer on the side wall effectively inhibits the surface leakage current.

Disclosed are a method and a device for the marker-free detection of an analyte in a fluid. At least one dielectric microsensor is used, which comprises a microresonator and an adsorbate layer for binding an analyte, which adsorbate layer is applied to the microresonator. The microresonator consists of a particle which comprises a dielectric material and a fluorescent marker. Furthermore, the microresonator has an optical refractive index that is higher than the optical refractive index of a fluid to be analyzed. The microresonator is suitable for allowing more than one resonance mode to form in the interior thereof when the fluorescent marker is excited. The optical thickness of the adsorbate layer of the microsensor is determined from spectral positions of at least two detected optical resonance modes of the microsensor and used to determine the extent to which an analyte has bonded to the at least one microsensor.

The invention provides a sensing device based on a stretchable metasurface and a heavy metal ion sensing method, and belongs to the technical field of optical sensing. The device comprises a flexible stretchable substrate and an optical metasurface arranged on the flexible stretchable substrate, a periodic nanostructure of the device can spontaneously suck liquid to be measured through the capillary effect, and meanwhile the metasurface period can be changed by stretching the substrate so as to tune the wavelength of an optical formant. The method comprises the following steps: applying strain to tune wavelength, introducing liquid to be measured to spontaneously fill, collecting spectrum and analyzing spectrum characteristics to determine the heavy metal ions. According to the invention, through integration of mechanical tuning and capillary sampling functions, the existing technical problems are solved, multi-dimensional detection based on wavelength selection and spectral line analysis is realized, and the device has the beneficial effects of high selectivity, high sensitivity, portability and capability of realizing multi-ion parallel detection.

The invention discloses a photoacoustic detection imaging system and method based on optical waveguide resonance sensing. The imaging system comprises a detection light source, a polarization assembly, a first focusing lens, a prism, an objective lens, a sensor, a spectroscope, a first polarization detection assembly, a second polarization detection assembly, a photoelectric detector, an exciting light source, a lens assembly, a first reflector, a second focusing lens, a second reflector, a two-dimensional mobile platform and an imaging processing terminal. The sensor is an optical waveguide resonance sensor. According to the imaging system, the combination of the sensor of the tightly limited detection electric field with extremely strong optical resonance and the coupling medium is arranged, so that the imaging system has ultra-high sensitivity and large-bandwidth photoacoustic detection capability; the exciting light irradiates the sample to generate the photoacoustic signal and acts with the coupling medium to obtain the detection light beam based on the light beam change, so that the photoacoustic microscopic imaging in a reflection mode can be realized, the three-dimensional microscopic imaging in a micrometer scale can be realized regardless of the thickness of the sample, and the depth resolution and the quality of the imaged image are greatly improved.

The method includes: 1) obtaining the inherent property parameters of the target system and / or the environmental refractive index change value Δn; the target system is a multi-resonant coupled system and / or an asymmetric BIC system; 2) constructing an equation based on the environmental refractive index change value Δn and / or the obtained inherent property parameters in step 1); when the target system is a multi-resonant coupled system, constructing a relationship between the resonance peak Qr value and the environmental refractive index change value Δn. This invention belongs to the field of optical physics, and particularly relates to a method for controlling the Q value of an optical resonance peak and its application. When the target system is an asymmetric BIC system, the radiation quality factor law of the asymmetric BIC system is used; 3) calculating based on equations 1 and 2, and adjusting or changing the asymmetry factor α of the environmental refractive index change value Δn based on the calculation results of the Qr value and the adjustment purpose to achieve the control of the Qr value. This invention can control the Qr value through changes in the environmental refractive index.

The disclosure provides an inertial sensor comprising, a fixed support structure, one or more test mass-sensing microresonators and one or more datum sensing microresonators supported on the fixed support structure, each microresonator supporting a corresponding optical resonance. The inertial sensor also comprises a micro-electromechanical structure including: a suspension structure anchored to the fixed support structure at an anchor point; one or more flexures coupled to the suspension structure; a test mass suspended from the suspension structure by the one or more flexures to be deflectable under the application of an inertial force on the micro-electromechanical structure, the test mass suspended to have respective deflection sense portions each facing and non-contiguous with one of the one or more test mass-sensing microresonators; the suspension structure comprising one or more rigid protrusions extending to locations proximate to the deflection sense portions of the test mass to provide datum sense portions each facing and non-contiguous with one of the one or more datum sensing microresonators, the datum sense portions being fixed relative to the anchor point and the test mass being deflectable relative to the datum sense portions. A change in a spacing between the deflection sense portions and the test mass-sensing microresonators due to an inertial force acting on the test mass causes a change in the optical resonance characteristics of the test mass-sensing microresonators, detectable to generate a sensing signal indicative of the inertial force on the test mass. A change in a spacing between the datum sense portions and the datum sensing microresonators due to undesired relative structural movements causes a change in the optical resonance characteristics of the datum sensing microresonators, detectable to generate an error signal usable to correct the measurement of the inertial force by the test mass-sensing microresonators.

A MEMS and / or NEMS measuring system includes: a resonant assembly including a plurality of N resonators indexed i, at least one resonant mechanical element coupled to each resonator, and at least one waveguide to which the optical resonators are coupled, an emission device, an injection device, each resonator of the resonant assembly further being configured to be excited at a mechanical excitation frequency and to modulate the light beam associated with the first excitation frequency, a resonant mechanical element being configured to be excited at a mechanical excitation frequency and to modify an optical transmission or reflection in the vicinity of the optical resonance of the associated resonator, the modification being dependent on a physical quantity to be measured, at least one detector, a demodulation device including a plurality of so-called LIA demodulation modules employing synchronous detection.

Surface sensing methods for imaging a scanned surface of a sample via sum-frequency vibrational spectroscopy are disclosed herein. The methods include exposing a sampled location of the scanned surface to a visible light beam and exposing the sampled location to a tunable infrared beam such that the tunable infrared beam is at least partially coincident with the visible light beam. The methods also include varying a frequency of the tunable infrared beam an inducing optical resonance within an imaged structure that extends at least partially within the sampled location. The methods further include receiving at least a portion of an emitted light beam from the sampled location and scanning the visible light beam and the runnable infrared beam across the scanned portion of the scanned surface. The methods also include generating an image of the scanned portion of the scanned surface based upon the receiving and the scanning.

An ion implantation system includes a wafer inspection system for inspecting wafers prior to ion implantation. The inspection facilitates diagnostics by helping distinguish the performance of an ion implantation process from the performance of upstream processes that affect the ion implantation process. The inspection may take place while the wafer is on an aligner (25), while it is in a load lock chamber (17A, 17B), or while it is otherwise being processed by a wafer transport system (11) in an end station (100). The inspection may be carried out without adding delay to wafer processing. The inspection may include modulated optical resonance (MOR) spectroscopy, and the inspection may be carried out through an optical fiber (23). The optical circuit may include a wavelength coupler so that a pump laser and probe laser of the MOR system can focus through one lens (21) on a narrowly determined inspection point.

To improve color uniformity and the like on an eye box.SOLUTION: A virtual image display device 100A, 100B, and an optical unit 100 each include: a first display panel 11a that emits first video light ML1 in a first color; a second display panel 11b that emits second video light ML2 in a second color; a third display panel 11c that emits third video light ML3 in a third color; a projection device 20 that collimates the rays of video light ML1, ML2, ML3 from the first display panel 11a, second display panel 11b, and third display panel 11c; and a light guide device 50 including light guide members 51, 52, 53 having respectively light guide plates 51a, 52a, 53a that guide the rays of video light, an input diffraction optical element DI that makes the rays of video light incident on the light guide plates, and an output diffraction optical element DO that makes the rays of video light emitted from the light guide plates. The first display panel 11a and the like are an organic EL display 14a and the like each provided with a secondary resonance type optical resonant structure RS including an inorganic insulating layer 74b as an optical path adjustment layer AL.SELECTED DRAWING: Figure 10

The present invention discloses a visible-infrared-radar band compatible stealth composite material, its preparation method and application. The composite material includes a woven layer, a wide-spectrum functional layer and a transparent medium layer; the woven layer includes a plurality of fibers, and there are pores between adjacent fibers; the material of the wide-spectrum functional layer includes metal and / or nitride and the thickness is below a preset thickness to form a discontinuous structure; the transparent medium layer covers the surface of the discontinuous structure and forms optical resonance with the discontinuous structure to produce structural color. The present invention utilizes the fiber structure of the woven layer to form a wide-spectrum functional layer with a discontinuous structure to cooperate with the medium layer to achieve colorful structural colors in the visible light range; in the thermal infrared band, the effect of low infrared emissivity is achieved through the reflection effect of the resonant cavity; in the radar wave range, the discontinuous wide-spectrum functional layer cannot effectively reflect radar waves, so the material has visible, infrared and radar multi-band compatible stealth performance.

The present invention discloses a gas detection method and system based on off-axis integrated output cavity enhanced photoacoustic spectroscopy. The method uses an off-axis integrated output cavity combined with a photoacoustic cell. The photoacoustic cell is placed inside the off-axis integrated output cavity structure. The laser forms an optical resonance in the off-axis integrated output cavity and at the same time interacts with the gas in the photoacoustic cell to generate a photoacoustic signal. Thus, the off-axis integrated output cavity increases the effective absorption path, the photoacoustic cell realizes the detection of the photoacoustic signal, reduces the influence of optical noise, and thereby improves the signal-to-noise ratio of the system. The system includes a laser controller, a laser, a collimator, an H-type photoacoustic cell, an off-axis integrated output cavity, a microphone module, a lock-in amplifier, a data acquisition card, and a host computer. This system has the advantages of being insensitive to optical noise, having a low detection limit, and high sensitivity.

This application relates to systems, apparatuses, and methods for interacting with spin-stored quantum information. A quantum information processing apparatus includes a semiconductor substrate. An optical resonator is coupled to the substrate. The optical resonator supports a first photonic mode having a first resonator frequency. The quantum information processing apparatus includes a non-gaseous chalcogenide donor atom disposed within the semiconductor substrate and optically coupled to the optical resonator. The donor atom has a transition frequency that resonates with the resonator frequency. Also disclosed herein are systems, apparatuses, articles, and methods having practical applications in quantum information processing including one or more deep impurities in a silicon substrate optically coupled to an optical structure or associated with the one or more deep impurities.

The invention discloses a tunable nano antenna and a preparation method thereof, and belongs to the technical field of nano antennae, and the tunable nano antenna sequentially comprises an ordered metal mesh nano electrode layer, a Fe3O4 magnetic nano sphere layer, a silicon nano column micro-nano structure layer, a substrate layer and a lower electrode layer from top to bottom. The invention provides a tunable nano antenna and a preparation method thereof. According to the preparation method, the silicon nanorods and the Fe3O4 magnetic nanospheres are combined, and the composite nano antenna with magnetic response and optical resonance characteristics is constructed by utilizing the synergistic effect of the silicon nanorods and the Fe3O4 magnetic nanospheres, so that the limitation of regulation and control of a single material can be broken through, and more flexible performance regulation and control can be realized through the dual effects of a magnetic field and a light field.

An ion implantation system includes a wafer inspection system for inspecting wafers prior to ion implantation. The inspection facilitates diagnostics by helping distinguish the performance of an ion implantation process from the performance of upstream processes that affect the ion implantation process. The inspection may take place while the wafer is on an aligner, while it is in a load lock chamber, or while it is otherwise being processed by a wafer transport system in an end station. The inspection may be carried out without adding delay to wafer processing. The inspection may include modulated optical resonance (MOR) spectroscopy, and the inspection may be carried out through an optical fiber. The optical circuit may include a wavelength coupler so that a pump laser and probe laser of the MOR system can focus through one lens on a narrowly determined inspection point.

The invention provides an integrated photon matrix vector multiplication calculator based on an optical resonant cavity and a method thereof. A continuum bound state is constructed on a chip by using an optical resonant cavity array, an output spectrum and a light field are analyzed through a coupled mode theory and a transmission matrix theory, amplitude of input light forms a one-dimensional input vector as a multiplier, a regulation and control matrix calculated by the coupled mode theory or a transmission matrix method is used as another multiplier, and the continuum bound state is obtained. An intelligent photon matrix vector multiplication calculator is constructed, construction of an on-chip large-scale compact continuum bound state BIC is realized, a non-Hermite control BIC system is introduced to generate space-time breaking, and single-mode output of a continuum bound state BIC mode is completed. And the calculation robustness and expandability of the intelligent photon matrix vector multiplication calculator based on the BIC configuration are further improved.

The invention discloses a novel basic adjustable unit and a programmable photon array and method thereof. Comprising a topological structure of basic adjustable units, and different functions including routing, switching, interference, resonance and the like are realized by reconfiguring internal adjustable elements; the invention also relates to a parallel field programmable photonic array which can implement different functions by cascading a plurality of substantially tunable cells to form a network and by configuring each substantially tunable cell in the programmable photonic array. According to the novel basic adjustable unit, optical resonance can be realized in the novel basic adjustable unit, and the problems of small free spectral range and waste of hardware resources caused by the fact that a plurality of basic adjustable units need to be cascaded to form optical resonance in an existing programmable photon array are solved.

The invention relates to a measurement system (10) of the MEMS and / or NEMs type comprising: • a resonant assembly (RE) comprising a plurality of N indexed OMRi resonators i, at least one resonant mechanical element MEij coupled to each OMRi resonator, and at least one waveguide (WG) to which the optical resonators are coupled, - an emission device (ED), - an injection device (ID), each OMRi resonator of the resonant assembly being further configured to be excited at a mechanical excitation frequency (fex / o(i)) and to modulate the light beam associated with said first excitation frequency (fex / o(i)), a resonant mechanical element (MEij) being configured to be excited at a mechanical excitation frequency (fex / e(i,j)) and to modify an optical transmission or reflection in the vicinity of the optical resonance of said associated resonator, said modification being a function of a physical quantity (u) to be measured,- at least one detector (Det) - a demodulation device (DDM) comprising a plurality of demodulation modules (11) of the synchronous detection type, called LIA.,

The invention discloses a core-shell parameter optimization SERS (Surface Enhanced Raman Scattering) signal regulation and control method, and particularly relates to the technical field of nano materials, comprising the following steps: S1, defining optical parameters of a target structure; s2, multi-source signals are synchronously acquired in real time; s3, generating fed-batch decision logic; s4, performing regulation and control execution and response evaluation; and S5, terminating judgment when the performance reaches the standard. According to the core-shell parameter optimization SERS signal regulation and control method disclosed by the invention, preparation of a core-shell nano structure is converted from open-loop empirical operation to closed-loop quantitative regulation and control. A geometric parameter combination with the strongest theoretical enhancement effect is screened out in advance through electromagnetic simulation, and the optical formant position of the geometric parameter combination is defined as a target value of the preparation process, so that the synthesis process has clear and quantitative optical performance guidance; raman characteristic peak intensity reflecting SERS signal intensity, plasma resonance peak position reflecting structure formation and particle size polydispersity index reflecting particle aggregation state are synchronously acquired in situ.

This invention relates to the field of atmospheric trace gas detection technology, specifically disclosing an ultra-high sensitivity online detection system and method for atmospheric BrO radicals. The ultra-high sensitivity online detection system for atmospheric BrO radicals includes an optical cavity, a 340 nm ultraviolet light source, an ultraviolet optical fiber, an ultraviolet spectrometer, and a sampling unit. The optical cavity has an inlet and an outlet, and contains an ultraviolet optical resonance region. Ultraviolet light emitted from the ultraviolet light source is reflected multiple times in the ultraviolet optical resonance region and then transmitted into the ultraviolet optical fiber. The ultraviolet optical fiber is used to superimpose all transmitted light in the ultraviolet band and transmit it to the ultraviolet spectrometer. The sampling unit is used to directly input the gas to be measured into the optical cavity, or to selectively remove BrO radicals from the gas to be measured before inputting it into the optical cavity. This invention achieves ultra-high sensitivity online point detection of BrO radicals in the atmosphere. Compared with existing technologies at home and abroad, its BrO detection limit is better than 1 pptv, reaching the sub-pptV level, demonstrating excellent detection performance.

A system for generating light radiation to neutralize microorganisms comprises a light source for emitting a light radiation, storage means with one or more unique identification codes, each of which is associated with a respective microorganism, and at least one respective wavelength range associated with said microorganism, and a logic control unit. The logic control unit is configured to select a wavelength range based on the microorganism to be neutralized, activate the light source in such a way that light radiation emitted by said light source has a wavelength within said selected wavelength range, so that, when the system is in use, the light radiation induces optical resonance in the microorganism, causing denaturation of genetic patrimony of the microorganism.

The invention discloses a rubidium atomic clock-cavity optical mechanical system photoproduction microwave source carrying a lithium niobate frequency doubling cavity. The rubidium atomic clock-cavity optical mechanical system photoproduction microwave source comprises a tunable laser source, a cavity optical mechanical system, a frequency doubling system, a rubidium atomic clock system and a feedback frequency locking system. According to the invention, a periodically poled lithium niobate waveguide is adopted as a frequency doubling system, frequency doubling processing is carried out on optical signals output by a silicon-based cavity optical mechanical system, a-1550nm wave band laser with a narrow line width and high device maturity is used for replacing a-795nm wave band laser, an optical microcavity with a high quality factor is prepared by a mature process, meanwhile, conditions required by hyperfine splitting of a rubidium atomic clock are met, and the optical microcavity can be applied to hyperfine splitting of a rubidium atomic clock. Compared with an existing mode of exciting an atomic clock through a micro-cavity made of a wide transparent window such as lithium niobate but an immature material in preparation process, the cavity optical mechanical chip processing and preparation precision is improved, the optical resonance Q value of the micro-cavity is improved by adopting a high-refractive-index silicon-based photonic crystal, and the maturity and stability of a system device are improved by adopting a 1550 nm waveband laser; and an efficient and stable photo-generated microwave signal source architecture can be realized.

The present invention discloses a photoacoustic detection imaging system and method based on optical waveguide resonance sensing. The imaging system includes a detection light source, a polarization component, a first focusing lens, a prism, an objective lens, a sensor, a spectroscope, a first polarization analyzer component, a second polarization analyzer component, a photodetector, an excitation light source, a lens component, a first reflector, a second focusing lens, a second reflector, a two-dimensional mobile platform, and an imaging processing terminal. The sensor is an optical waveguide resonance sensor. The imaging system is provided with a sensor having a tightly confined detection electric field with extremely strong optical resonance and a coupling medium combination, and has ultra-high sensitivity and wide bandwidth photoacoustic detection capabilities. The excitation light irradiates the sample to generate a photoacoustic signal, which interacts with the coupling medium to obtain a detection beam based on the change of the light beam, thereby realizing reflection mode photoacoustic microscopic imaging. Regardless of the thickness of the sample, three-dimensional microscopic imaging at the micrometer scale can be achieved, significantly improving the depth resolution and image quality.