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Scintillator device regulated and controlled by plasmon crystal

A plasmon and scintillator technology, which is applied in the field of nuclear radiation detection, can solve the problems of inability to regulate the luminescence decay time of scintillators, inability to regulate the directionality of luminescence, etc., and achieves the effect of improving detection efficiency and mature preparation technology.

Inactive Publication Date: 2016-10-26
TONGJI UNIV
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Problems solved by technology

[0003] In order to solve the problem of emission directionality, Liu Bo et al. (invention patent "a guided-mode resonance wave-shifting device for scintillation detection", application number: 201510598647.3) proposed to use the guided-mode resonance formed by photonic crystals to realize the directionality of light emission. regulation, but this structure cannot regulate the luminescence decay time of the scintillator
Bo Liu et al. (AppliedPhysics Letters, 104, 061902, 2014) reported that surface plasmons formed by metal particles were used to control scintillator luminescence, and a significant regulation of decay time was obtained, but the metal particles used were no Regular layout, so the directionality of the light cannot be adjusted

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The structural parameters are selected as follows: the metal periodic structure is a triangular structure. Period a=300nm, d=0.4X300nm=120nm, h 1 =40nm,h 2 =40nm, h 3 = h 1 + h 2 = 80nm.

[0033] In order to illustrate that the structure has a significant luminescence control effect in the normal direction, we performed FDTD simulations on the dispersion relationship of the optical properties of the structure, as shown in figure 2 shown. The results show that in the wavelength range of 400-420nm, the optical modes for the optical modes are mainly concentrated near 0 degrees, that is, near the normal direction.

[0034] The preparation process is as follows:

[0035] A first scintillator layer is prepared on a quartz substrate. A certain amount of Lu(NO 3 ) 3 6H2O (99.99%), Ce (NO 3 ) 3 ·6H 2O was dissolved in 2-methylethanol (99.99%, AR), ultrasonicated and stirred at room temperature until it was completely dissolved and became transparent, and then tetra...

Embodiment 2

[0041] A scintillator device regulated by plasmonic crystals, comprising a base layer, a first scintillator layer arranged on the base layer, a metal periodic array layer arranged on the first scintillator layer, and a metal periodic array layer arranged on the metal periodic array layer The metal periodic array layer in the above structure is actually immersed in the middle of the scintillator layer, but the preparation process must first prepare the first scintillator layer, then prepare the metal periodic array layer, and then prepare the second scintillator layer. The first scintillator layer is firmly in contact with the base layer and has sufficient hardness to bear the force during the preparation process of the metal periodic array layer.

[0042] The base layer is a silicon wafer with a flat surface. The metal periodic array layer is composed of columnar metal units distributed periodically in a square structure. The material of the metal units is silver, and the dist...

Embodiment 3

[0048] A scintillator device regulated by plasmonic crystals, the structure of which is basically the same as that of Embodiment 2, except that the substrate is quartz glass with a flat surface, and the metal periodic array layer is composed of columnar metal units periodically distributed in a triangular structure , the material of the metal unit is aluminum, the distance between adjacent metal units is 300nm, the diameter of the metal unit is 0.4 of the distance between adjacent metal units, and the height of the metal unit is 50nm.

[0049] The composition of the first scintillator layer is Lu 2 SiO 5 : Ce, with a thickness of 40nm, is produced by sol-gel method, and the temperature of the burning process is 1200°C, which is an optimal crystallization temperature and can obtain the optimal luminous efficiency. The composition of the second scintillator layer is Lu 2 SiO 5 : Ce, the thickness is the sum of the height of the first scintillator layer and the height of the m...

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Abstract

The invention relates to a scintillator device regulated and controlled by plasmon crystal. The scintillator device comprises a substrate layer, a first scintillator layer arranged on the substrate layer, a metal period array layer arranged on the first scintillator layer and a second scintillator layer arranged on the metal period array layer. The metal period array layer is formed by cylindrical metal units of square or triangular structures which are distributed in periods. Compared with the prior art, the regulation and control of a light emitting direction and the shortening of attenuation time are concentrated in one scintillator device, and the detection efficiency and the time resolution capability are simultaneously improved in the system application.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, in particular to a scintillator device regulated by plasmonic crystals. Background technique [0002] Scintillation detection systems have important uses in nuclear medical imaging, high-energy physics experiments, nuclear physics experiments, security inspections and other fields. The luminescence characteristics of scintillators determine the ability and practical range of scintillation detection, and are the core components in the detection system. The scintillator absorbs the energy of nuclear radiation particles and converts it into visible light or near-ultraviolet light, which is received by photodetectors, such as photomultiplier tubes, photodiodes, and CCD devices, to detect nuclear radiation. However, planar scintillators emit light without a specific orientation, and are Lambertian emitters that satisfy the cosine function. In order to prevent radiation from directly enterin...

Claims

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Application Information

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IPC IPC(8): G01T1/00
CPCG01T1/003
Inventor 刘波程传伟顾牡陈鸿陈亮刘金良欧阳晓平
Owner TONGJI UNIV
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