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Omnidirectional reflector of cascaded plasma photonic crystal structure

An omnidirectional reflection, plasma technology, applied in the direction of light guide, optics, instruments, etc., can solve the problems of complex structure and the width of omnidirectional band gap needs to be further improved.

Inactive Publication Date: 2016-05-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This prior technology is based on the 10th-order Fibonacci quasi-periodic structure to obtain an omnidirectional bandgap of 5.88GHz, but the structure is also too complicated (191 layers), and the omnidirectional bandgap width needs to be further improved

Method used

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  • Omnidirectional reflector of cascaded plasma photonic crystal structure
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  • Omnidirectional reflector of cascaded plasma photonic crystal structure

Examples

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Effect test

Embodiment 1

[0020] see Figure 1~Figure 4 , the omnidirectional reflector of this cascaded plasmonic photonic crystal structure can be expressed as (F 3 ) 3 / (T 2 ) 2 , that is, the multilayer structure of A and P arranged in a third-order Fibonacci sequence with three periods along the incident direction of the beam, with (F 3 ) 3 Indicates that superscript 3 and subscript 3 are the period and order of the Fibonacci sequence respectively, and the multi-layer structure of B and P` with two periods arranged in the second-order Thue-Morse sequence, with (T 2 ) 2 Indicates that superscript 2 and subscript 2 are the Thue-Morse sequence period and order respectively; where, A is the optical film medium, P is the plasma material layer, B is the optical film medium, and P` is the plasma material layer.

Embodiment 2

[0022]This embodiment is basically the same as Embodiment 1, and its special features are as follows: the omnidirectional reflector of this cascaded plasma photonic crystal structure, its third-order Fibonacci sequence F 3 =F 2 f 1 , where F 2 =F 1 f 0 , the first two Fibonacci sequences are F 0 ={AP} and F 1 ={P}, then F 2 =F 1 f 0 ={PAP},F 3 =F 2 f 1 ={PAPP}. Thue-Morse sequence T of order 2 2 = T 1 T` 1 , where T` 1 for pair T 1 according to Rule negation operation. start sequence T 1 ={BP`P`}, then T` 1 ={P`BP`},T 2 = T 1 T` 1 ={BP`P`P`BP`}. In addition, the optical thicknesses of the optical film dielectric layers A and B are equal or not; the optical thicknesses of the plasma layers P and P` are equal or not; and the plasma frequencies ω of the plasma layers P and P` p and ω p` The same, or not; the collision frequency γ of the plasma layers P and P` p and gamma p` the same, or not the same.

Embodiment 3

[0024] The omnidirectional reflector of the cascaded plasmonic photonic crystal structure of this embodiment is as attached figure 1 As shown in the structure, the overall structure consists of three periodic quasi-periodic structures arranged in a third-order Fibonacci sequence (F 3 ) 3 and 2 periods of quasi-periodic structures arranged in a 2nd-order Thue-Morse sequence (T 2 ) 2 Cascading composition, specifically (F 3 ) 3 / (T 2 ) 2 . where (F 3 ) 3 is a Fibonacci quasi-periodic structure, the Fibonacci sequence F 3 =F 2 f 1 , F 2 =F 1 f 0 ;The first two sequences are F 0 ={AP} and F 1 ={P}, then F 3 ={PAPP};(T 2 ) 2 For the Thue-Morse quasi-periodic structure, the Thue-Morse sequence T 2 = T 1 T` 1 , T` 1 for pair T 1 according to Rule negation operation, starting sequence T 1 ={BP`P`}, then T` 1 ={P`BP`},T 2 = T 1 T` 1 ={BP`P`P`BP`}. A and B are optical film media with different refractive indices, and P and P' are plasma material layers. ...

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Abstract

The invention relates to an omnidirectional reflector of a cascaded plasma photonic crystal structure. Fibonacci quasi periodic structures and Thue-Morse quasi periodic structures are cascaded to form the omnidirectional reflector; three periods of A and P multilayer structures whichare distributed according to a 3-order Fibonacci sequence and two periods of B and P' multilayer structures which are distributed according to a 2-order Thue-Morse sequence are sequentially distributed along the incidence direction of light, wherein the three periods of A and P multilayer structures are represented by (F3) <3>, 3 and <3> being the period and order of a Fibonacci sequence respectively, the two periods of the B and P' multilayer structures are represented by (T2) <2>, 2 and <2> being the period and order of a Thue-Morse sequence, A and B are optical film dielectrics with different refractive indexes, and P and P' are plasma material layers. The omnidirectional reflector of the invention has the advantages of simple structure, few layers and very large omnidirectional band-gap width and the like.

Description

technical field [0001] The invention relates to a heterogeneous structure of a one-dimensional plasma photonic crystal, in particular to an omnidirectional reflector with a cascaded plasma photonic crystal structure, which is mainly used for the omnidirectional reflector in an optical system. Background technique [0002] Since John and Yablonovitch proposed the concept of photonic crystals in 1987, after years of development, photonic crystals have become a rapidly developing research field in optoelectronics. Photonic crystals are a kind of periodic artificial microstructure medium whose lattice unit has the same magnitude as the incident wavelength. When light propagates in photonic crystals, it will interact with the periodic structure of photonic crystals to generate band gaps. The propagation of light waves can be easily controlled by using the band gap of photonic crystals, and its application potential has been demonstrated in various fields, and has been used in var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122
CPCG02B6/1225G02B6/1226
Inventor 张娟邹俊辉
Owner SHANGHAI UNIV
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