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Double ring type nanometer slit array-based angular momentum detection device and method

A nano-slit and detection device technology, applied in the field of ion optical detection, can solve the problems of time-consuming, laborious, complicated, light wave detection and analysis, etc., and achieve the effects of simple detection method, high light utilization rate, and convenient operation.

Active Publication Date: 2019-06-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technologies can distinguish between SAM and OAM, they still have many shortcomings: (1) for the detection of SAM and OAM, it is necessary to build an optical system, which is complicated and time-consuming; (2) for the detection of OAM, Not only to obtain data through experiments, but also to post-process the data; (3) SAM and OAM are detected separately, and it is not possible to detect and analyze light waves containing both SAM and OAM

Method used

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  • Double ring type nanometer slit array-based angular momentum detection device and method
  • Double ring type nanometer slit array-based angular momentum detection device and method
  • Double ring type nanometer slit array-based angular momentum detection device and method

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Embodiment 1

[0037] Such as figure 1 As shown in (A), the main structure of the detection device of the present invention is a piece of silver metal flakes with a length and width of 20 μm and a thickness of 0.2 μm. Taking the geometric center of the metal flake as the origin, a Cartesian coordinate system is established. , Etch two rings of nano-slits with designed size parameters at the specified position on the silver metal sheet. When the light wave of SAM / OAM irradiates the invention from the back of the silver metal sheet marked with the Cartesian coordinate system, it will be on the surface of the silver metal sheet A corresponding spot appears, and the SAM and OAM are detected and distinguished by the difference in spot position and intensity distribution.

[0038] Among them, the slits of the inner and outer rings satisfy the following relationship:

[0039]

[0040]

[0041] The distance between the inner nanoslit and the base line is d, and the rotation angle of the outer...

Embodiment 3

[0060] The spin and orbital angular momentum detection device based on the double-ring nanoslit array designed in Example 1 is used to detect OAM. When distinguishing the ±1 state of OAM, for a certain beam of light waves, it is inconvenient to exist alone, so it is considered in combination with SAM. Such as image 3 As shown in (A) and (B), no matter the SAM of the incident light wave is +1 or -1, when the incident light wave is +1 of OAM and -1 of OAM respectively, the SPPs spots generated by the detection device will appear in the The origin of the Cartesian coordinate system is also the center of the circle formed by the nano-slits. According to the set position where the light spot appears, the arrangement of the nano-slits is designed according to formulas (1)-(4), and other basic parameters of the nano-slits remain unchanged. According to the detection principle of OAM, formulas (5)~(8), use FDTD to simulate the distribution when the incident light wave is +1 of SAM,...

Embodiment 4

[0062] The spin and orbital angular momentum detection device based on the double-ring nano-slit array designed in Example 1 is used to simultaneously detect SAM and OAM, and use FDTD to simulate the light intensity distribution on the surface of metallic silver. Such as figure 2 (A) and (B), in the Cartesian coordinate system, set the +1 state of SAM, that is, LCP, the focus is at (-5μm, 0); the -1 state of SAM, that is, RCP, the focus is at (5μm,0 ). Then, according to the formulas (1)-(4), the specific position and rotation angle of each nano-slit are calculated, and the other basic parameters of the nano-slit remain unchanged, and the required detection device is designed. According to the detection principle of OAM, formulas (5)~(8), use FDTD to simulate the distribution when the incident light wave is +1 of SAM, that is, when the LCP and OAM are +1 and -1 respectively; when the incident light wave is -1 of SAM , that is, when RCP and OAM are +1 and -1 respectively, th...

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Abstract

The invention discloses a double ring type nanometer slit array-based angular momentum detection device and a method, which belong to the technical field of optical detection based on surface plasmons. A double ring type nanometer slit array-based spin and orbit angular momentum detection device designed by the invention can achieve simultaneous measurement on SAM and OAM, when detection is performed on the SAM, the OAM or mixing of the SAM and the OAM by utilizing the double ring type nanometer slit array-based spin and orbit angular momentum detection device, a degree of accuracy can reach 100%.

Description

technical field [0001] The invention relates to an angular momentum detection device and method based on a double-ring nano-slit array, and belongs to the technical field of optical detection based on surface plasmons. Background technique [0002] Traditional optical devices, such as prisms, lenses, and spiral phase plates, rely on the phase accumulation of light during transmission to generate the desired wavefront. Generally, such optical devices have irregular geometric shapes and large volumes, which are not conducive to the miniaturization and integration of devices. In recent years, metamaterials composed of artificially designed arrays of metallic or dielectric microstructures have received extensive attention from researchers. A metasurface is actually a two-dimensional metamaterial. By designing the geometric shape and spatial distribution of microstructure units, the spatial distribution of the amplitude, phase and polarization of the light field can be manipulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/42G01J1/04
Inventor 孔艳邱鹏王绶玙刘诚蒋志龙
Owner JIANGNAN UNIV