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One-dimensional photonic crystal amplitude limiting structure based on topological interface state and optical Kerr effect

A two-dimensional photonic crystal, photonic crystal technology, applied in nonlinear laser limiting applications, one-dimensional photonic crystal limiting structure field, can solve the problem of high transmittance and high attenuation rate, etc., to achieve stable position, high transmittance rate, high decay rate effect

Active Publication Date: 2020-06-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Its function is similar to a diode, which cannot achieve high transmittance under weak light and high attenuation rate under strong light

Method used

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  • One-dimensional photonic crystal amplitude limiting structure based on topological interface state and optical Kerr effect
  • One-dimensional photonic crystal amplitude limiting structure based on topological interface state and optical Kerr effect
  • One-dimensional photonic crystal amplitude limiting structure based on topological interface state and optical Kerr effect

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with drawings and embodiments.

[0025] Such as figure 1 As shown, the embodiment of the present invention provides a one-dimensional photonic crystal limiting structure based on the topological interface state and the optical Kerr effect. The one-dimensional photonic crystal limiting structure is composed of four kinds of media periodically arranged in a certain order Photonic crystal structure, assuming four media are A, B, C and D respectively, then the photonic crystal structure is (A 0.5 BA 0.5 ) N (C 0.5 DC 0.5 ) N, media A and B are nonlinear optical materials, which constitute the left part of the photonic crystal (PC_L), media C and D are linear optical materials, which constitute the right part of the photonic crystal (PC_R), and the subscript 0.5 represents half of the basic unit of the media, N represents the period number of the photonic crystal structure, and the range of N is 1-200...

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Abstract

The invention provides a photonic crystal amplitude limiting structure based on a topological interface state and an optical Kerr effect. The amplitude limiting structure is formed by periodically arranging four media into a photonic crystal according to a certain sequence. The four media are set as A, B, C and D, wherein a photonic crystal structure containing N periods is (A0.5BA0.5)N(C0.5DC0.5)N, the medium A and the medium B are nonlinear optical materials and form a left side part (PC_L) of the photonic crystal, the medium C and the medium D are linear optical materials and form a right side part (PC_R) of the photonic crystal, and a subscript 0.5 represents half of the basic unit of the medium. The topological properties of the left side part of the photonic crystal and the left sidepart of the photonic right crystal are different. High transmittance of weak light and high attenuation rate of strong light can be achieved for 1064.15 nm laser, and the structure can also be suitable for laser amplitude limiting of other wavelengths by selecting proper materials and adjusting thickness parameters.

Description

technical field [0001] The invention relates to the fields of topological states, photonic crystals and nonlinear optics, in particular to a one-dimensional photonic crystal limiting structure based on topological interface states and the optical Kerr effect, which can be applied to require high transmittance of weak light and high intensity of strong light. Decay rate for nonlinear laser limiting applications. Background technique [0002] Due to the excellent performance of lasers in terms of brightness, monochromaticity, directionality and monochromaticity, lasers are widely used in industrial, medical, military and other fields. However, high-intensity lasers will cause irreversible damage to the human eye and various optical detectors. For example, Q-switched lasers can easily reach MW / cm 2 The high power density of the order of magnitude, so it is necessary to limit the strong laser. And the laser with relatively weak power can be used as a signal detection light wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02B1/00
CPCG02B1/005G02F1/3501G02F1/3511
Inventor 路元刚黄剑周朗徐锋左敦稳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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