https://doi.org/10.1140/epjb/s10051-023-00598-9
Regular Article - Mesoscopic and Nanoscale Systems
Low-threshold bistable absorption in asymmetrical one-dimensional photonic crystals containing Weyl semimetal defects
1
Key Laboratory of Atonic and Subatomic Structure and Quantum Control (Ministry of Education), School of Physics, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, 510006, Guangzhou, China
2
School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, 510665, Guangzhou, China
e
fengwu@gpnu.edu.cn
f
yinchengping1979@163.com
Received:
22
August
2023
Accepted:
21
September
2023
Published online:
6
October
2023
In this paper, we investigate the low-threshold optical bistable absorption in an asymmetrical one-dimensional photonic crystal structure (1D-PhC) containing a Weyl semimetal (WSM) defect layer. Dirven by the strong third-order nonlinear effect of the WSM and the field enhancement of the defect mode, low-threshold bistable absorption is achieved in the terahertz band. After optimizing the parameters, the rising threshold intensity is 83.7817 MW/m2 and the falling threshold intensity is 49.39 MW/m2, which are lower than the threshold intensities of bistable absorption in the reported works. Meanwhile, we discuss the effects of Fermi level of WSM, incident angle, and the numbers of periods of the left and right 1D-PhCs on the bistable absorption. Our work would facilitate the design of high-performance all-optical switches, all-optical logics, and optical absorbers.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
