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Scintillator using periodic metal structure for modulation

A metal structure and scintillator technology, applied in the field of nuclear radiation detection, can solve problems such as low efficiency, achieve high luminous efficiency, avoid diffraction loss, and mature preparation technology

Active Publication Date: 2017-05-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a scintillator controlled by a periodic metal structure in order to overcome the problem of low efficiency when the surface lattice resonance on the silicon wafer substrate regulates directional emission in the prior art.

Method used

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  • Scintillator using periodic metal structure for modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In order to fully illustrate the role and effect of the transparent medium layer, two samples were produced in this embodiment. Sample a is a comparative sample without a transparent medium layer, and sample b is a sample with a transparent medium layer, which belongs to the structure of the present invention.

[0037] The parameters of sample a are as follows:

[0038] A silicon wafer is selected as the substrate, and the period of the metallic silver columnar array on the silicon wafer is 300nm, the diameter of the metallic silver is 140nm, and the height of the metallic silver is 90nm. The thickness of the plastic scintillator is 1 μm.

[0039] The preparation process of sample a is as follows:

[0040] 1. Preparation of metallic silver columnar array:

[0041] (1) Soft template preparation. Perfluorooctyltrichlorosilane was prepared on the hard template by the liquid phase method, so that the surface of the hard template used for nanoimprinting and the surface of...

Embodiment 2

[0063] A scintillator controlled by a periodic metal structure, its structure is as follows figure 1 As shown, it includes a base layer 1 , a transparent dielectric layer 2 plated on the upper surface of the base layer 1 , a metal periodic array structure 3 arranged on the transparent dielectric layer 2 , and a plastic scintillator 4 arranged on the metal periodic array structure 3 .

[0064] The transparent medium layer 2 is a transparent medium layer in the plastic scintillator emission spectrum interval (380-450nm), and its refractive index n 2 and the refractive index n of the plastic scintillator 1 Satisfy the following relation:|n 1 -n 2 |1 =1.55, the matrix given in this example is polymethylstyrene, so its refractive index is 1.55. In this embodiment, the thickness of the transparent medium layer is 1 μm, and its material is CaF 2 .

[0065] The base layer used is a silicon wafer, and the metal periodic array structure is an array formed by columnar metal silver u...

Embodiment 3

[0068] A scintillator controlled by a periodic metal structure, comprising a base layer, a transparent dielectric layer plated on the upper surface of the base layer, a metal periodic array structure arranged on the transparent dielectric layer, and a plastic scintillator arranged on the metal periodic array structure .

[0069] The transparent medium layer is a transparent medium layer in the luminescence range (380-450nm) of the plastic scintillator, and its refractive index n 2 and the refractive index n of the plastic scintillator 1 Satisfy the following relation:|n 1 -n 2 |1 =1.49, the refractive index of polymethyl methacrylate is 1.49. In this embodiment, the thickness of the transparent medium layer is 1.5 μm, and its material is BaF 2 .

[0070] The base layer used is a silicon wafer, and the metal periodic array structure is an array formed by columnar metal silver units distributed periodically in a square structure. The distance between adjacent metal units is...

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Abstract

The invention relates to a scintillator using a periodic metal structure for modulation; the scintillator comprises a substrate layer, a metal periodic array structure arranged on the substrate layer, a plastic scintillator arranged on the metal periodic array structure, and a transparent medium layer plated on the top surface of the substrate layer; the metal periodic array structure is arranged on the top surface of the transparent medium layer. Compared with the prior art, the transparent medium layer is added on a silicon substrate so as to prevent an overly large refractivity difference caused by direct contacts between the metal periodic array and the silicon substrate, thus effectively preventing over large diffraction loss, and maximumly keeping a high luminescence efficiency in modulation in an effectively direction.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, in particular to a scintillator controlled by a periodic metal structure. Background technique [0002] Scintillation detection systems have important uses in nuclear medical imaging, high-energy physics experiments, nuclear physics experiments, nuclear weapon detection, anti-terrorism security checks and other fields. The scintillator absorbs the energy of nuclear radiation particles and converts it into visible light or near-ultraviolet light, which is received by photodetectors (photomultiplier tubes, photodiodes, CCD devices, etc.) to detect nuclear radiation. The luminescence characteristics of scintillators determine the ability and application range of scintillation detectors, and they are the core devices in the detection system. However, planar scintillators emit light without a specific orientation, and are Lambertian emitters that satisfy the cosine function. In order to pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/203
CPCG01T1/203
Inventor 刘波程传伟顾牡陈鸿陈亮刘金良欧阳晓平
Owner TONGJI UNIV