Anti-PT symmetric Cantor photonic crystal structure capable of realizing directional suppression of reflected light
A photonic crystal and reflected light technology, applied in the field of all-optical communication, can solve the problem of unfavorable detection of lateral displacement of reflected light beams
Inactive Publication Date: 2022-01-14
HUBEI UNIV OF SCI & TECH
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[0004] When studying the lateral displacement of the reflected beam, it is necessary to use partially reflected reflected light, and near the resonance state, the lateral displacement effect of the beam is the largest, while the resonant mode reflectivity of the PT symmetric system is generally zero, which is very important for detecting the reflected beam. The lateral displacement is very unfavorable
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[0017] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.
[0018] Mathematically, the iteration rule of the Cantor sequence is: S 0 = H, S 1 = HLH, S 2 =HLHLLLHLH,...,S N = S N-1 (LLL) N-1 S N-1 ,..., where N (N=0, 1, 2, 3,...) represents the serial number of the sequence, S N Represents the Nth item of the sequence. In the corresponding Cantor photonic crystal, letters H and L represent two kinds of homogeneous dielectric sheets with high and low refractive index respectively.
[0019] figure 1 Shown is a schematic structure diagram of Anti-PT symmetric Cantor photonic crystal with serial number N=2. The Cantor photonic crystal with serial number N=2 can be expressed as: HLHLLLHLH, wherein the letters H and L respectively represent two kinds of homogeneous dielectric she...
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Abstract
The invention provides an Anti-PT symmetric cantor photonic crystal structure capable of realizing directional suppression of reflected light, and belongs to the technical field of all-optical communication. The structure comprises two Cantor photonic crystals, and the two Cantor photonic crystals are formed by sequentially stacking two dielectric sheets with different refractive indexes according to a Cantor sequence rule to form a symmetrical distribution structure about a central origin; the photonic crystal structure meets Anti-PT symmetrical distribution: n (z) =-n * (-z); the entire structure may be represented as HLHLLLHLHH'L'H'L'L'L'H'L'H'; the dielectric flakes H and L' represent first dielectric layers of high refractive index and the dielectric flakes H' and L represent second dielectric layers of low refractive index. The structure has the advantages of being capable of achieving directional suppression or enhancement of the light wave reflectivity and the like.
Description
technical field [0001] The invention belongs to the technical field of all-optical communication, and relates to an Anti-PT symmetrical Cantor photonic crystal structure capable of directional suppression and enhancement of reflected light. Background technique [0002] When there is an imaginary part of the refractive index of the dielectric, that is, when there is gain or loss in the material, the reflection spectra of left and right incident light do not overlap. In particular, when the refractive index of the system satisfies PT (Parity-time: parity-time) symmetry in space, the positions of the reflectivity zeros in the left and right reflection spectra are different. In this way, when light waves of the same wavelength are incident from left and right directions, there will be one side with zero reflectance and the other side with a finite reflectance. This effect can be applied to optical directional stealth. [0003] In a PT-symmetric optical system, the refractive ...
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IPC IPC(8): G02F1/35G02F1/355
CPCG02F1/3503G02F1/3523G02F1/353G02F1/3551
Inventor 杨荣
Owner HUBEI UNIV OF SCI & TECH