CN219532268U

CN219532268U - Polarization detection grating

Info

Publication number: CN219532268U
Application number: CN202320178277.8U
Authority: CN
Inventors: 詹健龙; 尚林涛; 陶晟
Original assignee: Zhejiang Kunteng Infrared Technology Co ltd
Current assignee: Zhejiang Kunteng Infrared Technology Co ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-08-15
Anticipated expiration: 2033-02-10

Abstract

The utility model discloses a polarization detection grating, which comprises a lining plate and a table top plate positioned above the lining plate, wherein the table top plate is of an open design with an opening at the top, the side wall of the table top plate is of an annular design, the inner side structure of the table top plate is divided into a first detection module and a second detection module, the first detection module comprises a first outer reflecting surface, a first middle reflecting surface and a first inner reflecting surface, the included angles of the first outer reflecting surface and the first middle reflecting surface are the same, and the included angles of the first middle reflecting surface and the first inner reflecting surface are the same, and the second detection module comprises a second outer reflecting surface, a second outer middle reflecting surface, a second inner reflecting surface and a second inner reflecting surface, and the included angles of the second outer reflecting surface and the second outer middle reflecting surface and the second inner reflecting surface are the same. The polarization detection grating is suitable for light entering from different incidence angles, so that the detection range of the polarization detection grating is larger.

Description

Polarization detection grating

Technical Field

The utility model belongs to the technical field of optical elements, and particularly relates to a polarization detection grating.

Background

Compared with other infrared technologies, the quantum well infrared detector has the advantages of high response speed, high detection rate, adjustable detection wavelength, good radiation resistance and the like, and in the existing quantum well infrared detection chip (QWIP) manufacturing technology, the two-dimensional grating is applied by most manufacturers. According to the quantum transition selection rule, for an n-type quantum well infrared detector, only incident light with an electric vector perpendicular to the growth surface of the quantum well can be absorbed by electrons in a subband and transition from a ground state to an excited state, so optical coupling is needed to enable radiation to be absorbed by the detector.

In carrying out the present utility model, the inventors have found that at least the following problems exist in this technology: two-dimensional grating coupling is the most widely used coupling mode at present, but most of the existing polarization gratings have higher requirements on the incidence angle of light, if the incidence angle of the light is more biased, the light is likely not to be received, so that the detection range of the polarization gratings is reduced.

For this purpose, we propose a polarization detection grating to solve the above-mentioned problems.

Disclosure of Invention

The utility model mainly aims to provide a polarization detection grating, which adapts to light emitted from different incident angles through the design of a plurality of reflecting surfaces of each detection module, so that the detection range of the polarization detection grating is larger, and the problems in the background technology can be effectively solved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the polarization detection grating comprises a lining plate and a table top plate positioned above the lining plate, wherein the table top plate is of an open design with an opening at the top, the side wall of the table top plate is of an annular design, and the inner side structure of the table top plate is divided into a first detection module and a second detection module;

the first detection module comprises a first outer reflecting surface, a first middle reflecting surface and a first inner reflecting surface, wherein the included angles of the first outer reflecting surface and the first middle reflecting surface are the same as those of the first middle reflecting surface and the first inner reflecting surface;

the second detection module comprises a second outer reflecting surface, a second outer middle reflecting surface, a second inner middle reflecting surface and a second inner reflecting surface, wherein the included angles of the second outer reflecting surface and the second outer middle reflecting surface, the second outer middle reflecting surface and the second inner middle reflecting surface, and the second inner middle reflecting surface and the second inner reflecting surface are the same.

As a preferred embodiment, the included angles between the first outer reflecting surface and the first middle reflecting surface, and between the first middle reflecting surface and the first inner reflecting surface are all 157.5 degrees; the first outer reflecting surface, the first middle reflecting surface and the first inner reflecting surface have the same light acceptance, so that the light from the outside can be maximally received.

As a preferred embodiment, the included angles of the second outer reflecting surface and the second outer middle reflecting surface, the second outer middle reflecting surface and the second inner middle reflecting surface, and the second inner middle reflecting surface and the second inner reflecting surface are all 162 degrees; the second outer reflecting surface, the second outer middle reflecting surface, the second inner middle reflecting surface and the second inner reflecting surface have the same acceptance of light, so that the light from the outside can be received maximally.

As a preferred embodiment, the bottom of the opening of the deck plate is formed with a horizontal bottom reflecting surface; so that light not received by the first and second detection modules is received by the bottom reflection surface.

As a preferred embodiment, the included angle between the first inner reflecting surface and the bottom reflecting surface is 157.5 degrees, and the included angle between the second inner reflecting surface and the bottom reflecting surface is 162 degrees; the bottom reflecting surface is used as a continuation of the first detection module and the second detection module and can also receive light.

As a preferred embodiment, a columnar rod is connected to the center of the bottom reflecting surface; the columnar bars are used as interceptors, so that the situation that light continuously reflects in the opening of the table panel and cannot be restrained or reflected out can be reduced.

In summary, the technical effects and advantages of the present utility model are:

the polarization detection grating adapts to light emitted from different incident angles through the design of a plurality of reflecting surfaces of each detection module, so that the detection range of the polarization detection grating is larger;

according to the polarization detection grating, the angles between every two adjacent reflecting surfaces are the same, so that the incident angles of light rays which can be received by different reflecting surfaces are the same, and the number of the reflecting surfaces can be increased according to actual needs, so that the polarization sensitivity of the polarization detection grating is further enhanced.

Drawings

FIG. 1 is a schematic view of a structure of one side of the present utility model;

FIG. 2 is a schematic view of another embodiment of the present utility model;

fig. 3 is a top view of the present utility model.

In the figure: 1. a lining plate; 2. a deck plate; 3. a first detection module; 301. a first outer reflective surface; 302. a first middle reflecting surface; 303. a first inner reflective surface; 4. a second detection module; 401. a second outer reflective surface; 402. a second outer middle reflective surface; 403. a second inner middle reflecting surface; 404. a second inner reflective surface; 5. a bottom reflective surface.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-3, a polarization detection grating comprises a lining board 1 and a table top board 2 positioned above the lining board 1, wherein the table top board 2 is of an open design with an opening at the top, the side wall of the table top board 2 is of an annular design, and the inner side structure of the table top board 2 is divided into a first detection module 3 and a second detection module 4;

the first detection module 3 comprises a first outer reflecting surface 301, a first middle reflecting surface 302 and a first inner reflecting surface 303, wherein the included angles of the first outer reflecting surface 301 and the first middle reflecting surface 302, and the included angles of the first middle reflecting surface 302 and the first inner reflecting surface 303 are the same, and the included angles of the first outer reflecting surface 301 and the first middle reflecting surface 302, and the included angles of the first middle reflecting surface 302 and the first inner reflecting surface 303 are 157.5 degrees, so that the light acceptances of the first outer reflecting surface 301, the first middle reflecting surface 302 and the first inner reflecting surface 303 are the same, and the light receiving from the outside can be maximized;

the second detection module 4 includes a second outer reflecting surface 401, a second outer middle reflecting surface 402, a second inner middle reflecting surface 403 and a second inner reflecting surface 404, where the second outer reflecting surface 401 is the same as the second outer middle reflecting surface 402, the second outer middle reflecting surface 402 is the same as the second inner middle reflecting surface 403, the second inner middle reflecting surface 403 is the same as the second inner reflecting surface 404, and the second outer reflecting surface 401 is 162 degrees with the second outer middle reflecting surface 402, the second outer middle reflecting surface 402 is the second inner middle reflecting surface 403, the second inner middle reflecting surface 403 is the second inner reflecting surface 404, so that the acceptance of the second outer reflecting surface 401, the second outer middle reflecting surface 402, the second inner middle reflecting surface 403 and the second inner reflecting surface 404 to light is the same, thereby being capable of maximally receiving external light;

a horizontal bottom reflecting surface 5 is formed at the bottom of the opening of the table top 2, so that the bottom reflecting surface 5 is used for receiving the light which is not received by the first detecting module 3 and the second detecting module 4, the included angle between the first inner reflecting surface 303 and the bottom reflecting surface 5 is 157.5 degrees, the included angle between the second inner reflecting surface 404 and the bottom reflecting surface 5 is 162 degrees, the bottom reflecting surface 5 is used as a continuation of the first detecting module 3 and the second detecting module 4, the light can be received, a columnar rod is connected at the center of the bottom reflecting surface 5, and the arranged columnar rod is used as an interceptor, so that the situation that the light continuously reflects in the opening of the table top 2 and cannot be restrained or reflected can be reduced.

Working principle: after entering the opening of the table top 2, the external light is directly received by the bottom reflecting surface 5, or is received through the first outer reflecting surface 301, the first middle reflecting surface 302 and the first inner reflecting surface 303 on the first detection module 3, or is received through the second outer reflecting surface 401, the second outer middle reflecting surface 402, the second inner middle reflecting surface 403 and the second inner reflecting surface 404 on the second detection module 4, and the directions of the reflecting surfaces are different, so that the light from different incident angles can be received, the receiving range is increased, and the polarization sensitivity of the polarization detection grating is higher.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The polarization detection grating comprises a lining plate (1) and a table top plate (2) positioned above the lining plate (1), and is characterized in that the table top plate (2) is of an open design with an opening at the top, the side wall of the table top plate (2) is of an annular design, and the inner side structure of the table top plate (2) is divided into a first detection module (3) and a second detection module (4);

the first detection module (3) comprises a first outer reflecting surface (301), a first middle reflecting surface (302) and a first inner reflecting surface (303), wherein the included angles of the first outer reflecting surface (301) and the first middle reflecting surface (302), and the included angles of the first middle reflecting surface (302) and the first inner reflecting surface (303) are the same;

the second detection module (4) comprises a second outer reflecting surface (401), a second outer middle reflecting surface (402), a second inner middle reflecting surface (403) and a second inner reflecting surface (404), wherein the included angles of the second outer reflecting surface (401) and the second outer middle reflecting surface (402), the second outer middle reflecting surface (402) and the second inner middle reflecting surface (403), and the included angles of the second inner middle reflecting surface (403) and the second inner reflecting surface (404) are all the same.

2. A polarization detection grating according to claim 1, wherein the angles between the first outer reflective surface (301) and the first intermediate reflective surface (302), and between the first intermediate reflective surface (302) and the first inner reflective surface (303) are all 157.5 °.

3. A polarization detection grating according to claim 2, wherein the angles between the second outer reflective surface (401) and the second outer reflective surface (402), the second outer reflective surface (402) and the second inner reflective surface (403), and the second inner reflective surface (403) and the second inner reflective surface (404) are all 162 °.

4. A polarization detection grating according to claim 3, characterized in that the open bottom of the table top plate (2) is formed with a horizontal bottom reflecting surface (5).

5. A polarization detection grating according to claim 4, wherein the first inner reflective surface (303) is at an angle of 157.5 ° to the bottom reflective surface (5), and the second inner reflective surface (404) is at an angle of 162 ° to the bottom reflective surface (5).

6. A polarization detection grating according to claim 4, wherein a cylindrical rod is connected to the center of the bottom reflecting surface (5).