光学
超晶格
云纹
硅
材料科学
透射率
纳米结构
克尔效应
电场
光电子学
非线性光学
纳米技术
非线性系统
激光器
物理
量子力学
作者
Zhongshuai Zhang,Di Liu,Yanyan Huo,Tingyin Ning
出处
期刊:Optics Letters
[The Optical Society]
日期:2022-10-04
卷期号:47 (20): 5260-5260
被引量:2
摘要
We report an all-optical self-switching performed at an ultralow-level of intensity in a nanostructured moiré superlattice on a silicon platform. The moiré superlattice was formed by twisting two sets of triangular lattices in a silicon membrane in the same layer with a twist angle of 9.43°. The near flatband was formed, and the electric field was well confined in the center of the superlattice, which enabled all-optical switching under an ultralow intensity when the Kerr nonlinearity of silicon was considered. The intensity, which was reduced to 300 W/m2 and even 20 W/m2, can cause the transmittance of the nanostructure to change from 0 to 80% under x- and y-polarized pump light, respectively, and could be further decreased by optimizing the nanostructure or nonlinear materials. The results indicate that moiré superlattices fabricated from nonlinear materials are promising for integrated all-optical devices.
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