Photonic crystal heterostructure capable of realizing broadband light wave one-way transmission

Abstract

The invention belongs to the field of optical devices, and discloses a photonic crystal heterostructure capable of realizing broadband light wave one-way transmission. The photonic crystal heterostructure comprises a silicon dioxide substrate, on which is grown a thin silicon layer. By taking a heterojunction interface as a boundary, a plurality of medium silicon cylinders, which are periodicallyarranged are etched on the left side of the thin silicon layer, are used to form a first photonic crystal structure PC 1, and a plurality of square air holes, which are periodically arranged, are etched on the right side of the thin silicon layer to form a second photonic crystal structure PC 2. The height of the medium silicon cylinder and the depth of the square air holes are equal to the thickness of the thin silicon layer. The light wave is incident from the first photonic crystal structure PC 1 side, and is used to form an included angle of 45 degrees with the heterojunction interface. The photonic crystal heterostructure is easy to prepare, convenient to integrate, high in one-way transmittance, capable of realizing the one-way transmission characteristic of high forward transmissionand capable of being widely applied to the field of quantum optics.

Description

technical field [0001] The invention belongs to the field of optical devices, specifically to the field of optical quantum communication and quantum computing, and specifically relates to a photonic crystal heterogeneous structure capable of realizing broadband light wave unidirectional transmission. Background technique [0002] Unidirectional transmission of photonic diodes has become a key component of quantum computers due to their ability to perform logic operations. Due to the characteristics of small size, easy optical integration and low transmission loss, photonic crystals have become the preferred choice for the preparation of unidirectional transmission devices. Utilizing the energy band characteristics of photonic crystals, the photonic crystal structure can be designed to realize the one-way transmission of light waves, which has laid the foundation for the application of one-way transmission photonic diodes in quantum computing and information processing. [0...

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Problems solved by technology

Liu (L. Dan , S. Hu ,and Y. Gao . "One-way optical transmission in silicon photonic crystalheterojunction with circular and square scatterers." Physics LettersA(2017)), studied the orthogonal square air hole photonic crystal heterojunction Junction, although the one-way transmission bandwidth is about 0.04a / λ, but the fluctuation of the forward transmission peak is relatively large, and the forward high transmission cannot be maintained in a wide frequency range

[0004] Fei Hongming et al. (Fei Hongming, Xu Ting, Liu Xin, Lin Han, Chen Zhihui, Yang Yibiao, Zhang Mingda, Cao Binzhao, Liang Jiuqing, "Photonic crystal heterostructure interfaces that can be used to broaden the bandwidth of light wave unidirectional transmission," Acta Physica 66, 60 -68(2017)) studied the air-hole-type two-dimensional photonic crystal heterostructure to realize unidirectional transmission of light waves, but the structure uses two substrate materials with different dielectrics, the maximum forward transmittance is only 0.64, and the transmittance is greater than 0.5 The unidirectional transmission bandwidth is also relatively low, only 70nm

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