Portable dispersion spectrometer

Abstract

The utility model relates to a portable dispersion spectrometer, which belongs to the technical field of spectrometers and comprises a collimation assembly, a metasurface device and a detector. The collimation assembly is used for carrying out reflection / transmission collimation on incident light and enabling the collimated light to be incident on the metasurface device; the light passing through the metasurface device is emitted and focused on the detector at different angles according to different wavelengths of the light; the metasurface device at least comprises a metasurface transmitting / reflecting mirror, and at least one surface of the metasurface transmitting / reflecting mirror is provided with a micro-nano structure. According to the invention, the number of optical elements is reduced, and the overall size and weight are reduced.

Description

Technical Field

[0001] The present application belongs to the field of spectrometers, and in particular to a portable dispersive spectrometer. Background Art

[0002] A spectrometer is a device used to analyze and measure light. It is widely used in agriculture, chemical analysis, medical treatment, environmental analysis, material analysis and other fields.

[0003] The dispersive spectrometer mainly uses the dispersion characteristics of light to separate the incident complex light into monochromatic light emitted in different directions through a spectroscopic element (prism, grating, etc.), and then the detector receives the signal.

[0004] However, traditional dispersive spectrometers have complex optical paths, are large in size, and are not convenient to carry. Utility Model Content

[0005] The present application provides a portable dispersive spectrometer to at least solve the above technical problems existing in the prior art.

[0006] On the one hand, an embodiment of the present application provides a portable dispersive spectrometer, including a collimation component, a metasurface device and a detector; the collimation component reflects and collimates the incident light, and incidents the collimated light on the metasurface device; the light passing through the metasurface device is emitted at different angles according to the wavelength of the light and is focused on the detector; the metasurface device includes at least one metasurface transmissive / reflective mirror, and at least one surface of the metasurface transmissive / reflective mirror has a micro-nano structure.

[0007] In one possible implementation, the collimation assembly includes a collimation stop and a collimation element.

[0008] In one possible implementation manner, the collimating aperture is a slit or a small hole; and the collimating element is a single lens, a lens group or a reflector.

[0009] In one possible implementation manner, it also includes a device aperture, and the device aperture is arranged on the metasurface device.

[0010] In one possible implementation manner, the device aperture is a light-proof structure, and its size is smaller than the effective working size of the metasurface device.

[0011] In one possible implementation manner, the micro-nano structure is a periodic nano-column or nano-hole; the micro-nano shape is one or more of a circle, a rectangle, a triangle, a hexagon, a cross and an ellipse.

[0012] In one possible implementation, the micro-nano structures are arranged in a tetragonal, oblique tetragonal or hexagonal pattern.

[0013] In one possible implementation manner, the micro-nano structures are arranged in a binary surface or a maze-like surface with pixel arrangement.

[0014] In one possible implementation, the substrate of the metasurface device is a single layer or a multilayer.

[0015] In one embodiment, the detector is a charge coupled device, a complementary metal oxide semiconductor or a single photon avalanche diode.

[0016] Compared with the existing technology, it has the following advantages:

[0017] 1. The portable dispersive spectrometer of the present application uses a metasurface device with integrated splitting and focusing functions to replace the grating / prism and focusing lens of the traditional spectrometer, which reduces the number of optical components and the overall volume and weight;

[0018] 2. The metasurface device designed in this application is based on a planar substrate and is easier to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a micro-nano structure in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of the structure of a portable dispersive spectrometer in an embodiment of the present application;

[0021] Figure 3 This is a flow chart of the design of the arrangement of nano-medium columns in the embodiment of the present application;

[0022] Figure 4 is the overall optical path diagram of the portable dispersive spectrometer in the embodiment of the present application;

[0023] Description of reference numerals:

[0024] 1. Structural support; 2. Collimating aperture; 3. Off-axis parabolic mirror; 4. Device aperture; 5. Metasurface device; 6. Detector. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings.

[0026] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] The present application discloses a portable dispersion spectrometer, including a collimation component, a metasurface device and a detector. The collimation component performs reflection / transmission collimation on the incident light and incidents the collimated light onto the metasurface device. The light passing through the metasurface device is emitted at different angles according to the wavelength of the light and focused onto the detector.

[0028] Specifically, it also includes a device aperture, which is arranged on the metasurface device and is a light-proof structure, and its size is smaller than the effective working size of the metasurface device.

[0029] The collimation assembly includes a collimation aperture and a collimation element. The collimation aperture is a slit or a small hole, and the collimation element is a single lens, a lens group or a reflector.

[0030] The substrate of the metasurface device is a single layer or a multilayer, and includes at least one metasurface transmissive / reflective mirror, and at least one surface of the metasurface transmissive / reflective mirror has a micro-nano structure. The micro-nano structure is a periodic nano-column or nano-hole. Figure 1 As shown, the arrangement of the micro-nano structures can be a regular square, an oblique square or a hexagonal surface, or a binary surface with a pixel arrangement or a maze-like surface.

[0031] When the arrangement of the micro-nano structures is a regular square, an oblique square or a hexagon, the micro-nano shape may be one or more of a circle, a rectangle, a triangle, a hexagon, a cross and an ellipse.

[0032] The detectors are charge coupled devices, complementary metal oxide semiconductors or single photon avalanche diodes.

[0033] like Figure 2 As shown, the portable dispersive spectrometer includes a structural support 1, a collimating aperture 2, an off-axis parabolic mirror 3, a device aperture 4, a metasurface device 5 and a detector 6.

[0034] The collimating aperture 2 and the off-axis parabolic mirror 3 form a reflective collimating optical path, which reflects and collimates the incident light, and then incidents on the metasurface device with the device aperture 4. Among them, the device aperture 4 is an opaque structure with a size slightly smaller than the effective working size of the metasurface device 5. After the incident light passes through the metasurface device 5, it is emitted at different angles according to the wavelength of the light and focused on the detector 6. By reading the intensity values ​​of different pixel positions on the detector 6, the incident spectrum can be obtained. The overall optical path of the above device is as follows: Figure 3 shown.

[0035] The metasurface device 5 is composed of a single-sided metasurface lens, the lens substrate is a quartz plate, and nano-medium columns of different sizes are arranged on one surface, and the dielectric material is transparent in the visible light band. The design process of the arrangement of nano-medium columns is as follows: Figure 3As shown, it adopts a periodic nanocolumn arrangement structure. Therefore, when designing, first scan the height, period and diameter of the nanocolumns according to the working band, and then select the appropriate height and period so that the phase covers 0 to 2π and the transmittance is high when the diameter changes. Then, the focusing conditions of each wavelength on the detection surface are taken as the target. It can be arranged according to the oblique focusing phase plane formula, or a random phase plane can be used as the initial phase to arrange the nanocolumns. The nanocolumn size matrix is ​​set as a variable, and the nanocolumn size matrix is ​​optimized by the concomitant optimization method, and finally a suitable nanocolumn size matrix is ​​obtained. The oblique focusing phase plane formula is as follows:

[0036]

[0037] where x, y are the coordinates of the metasurface nanocolumns, λ is the design wavelength, and α and f are as follows Figure 4 As indicated by the markings.

[0038] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A portable dispersive spectrometer, characterized in that: including collimation components, metasurface devices, and detectors; The collimation component performs reflection / transmission collimation on the incident light, and makes the collimated light incident on the metasurface device; Light passing through the metasurface device is emitted at different angles and focused onto the detector, depending on the wavelength of the light; The metasurface device comprises at least one metasurface transmissive / reflective mirror, and at least one surface of the metasurface transmissive / reflective mirror has a micro-nano structure.

2. A portable dispersive spectrometer according to claim 1, characterized in that: The collimation assembly includes a collimation stop and a collimation element.

3. A portable dispersive spectrometer according to claim 2, characterized in that: The collimating aperture is a slit or a small hole; the collimating element is a single lens, a lens group or a reflector.

4. A portable dispersive spectrometer according to claim 1, characterized in that: It also includes a device aperture, which is arranged on the metasurface device.

5. A portable dispersive spectrometer according to claim 4, characterized in that: The device aperture is a light-proof structure, and its size is smaller than the effective working size of the metasurface device.

6. A portable dispersive spectrometer according to claim 1, characterized in that: The micro-nano structure is a periodic nano-column or nano-hole; the nano-shape is one or more of a circle, a rectangle, a triangle, a hexagon, a cross and an ellipse.

7. A portable dispersive spectrometer according to claim 1 or 6, characterized in that: The arrangement of the micro-nano structures is tetragonal, oblique tetragonal or hexagonal.

8. The portable dispersive spectrometer according to claim 1, characterized in that: The arrangement of the micro-nano structures is a binary surface with pixel arrangement or a maze-like surface.

9. The portable dispersive spectrometer according to claim 1, characterized in that: The substrate of the metasurface device is a single layer or multiple layers.

10. The portable dispersive spectrometer according to claim 1, characterized in that: The detector is a charge coupled device, a complementary metal oxide semiconductor or a single photon avalanche diode.

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