Abstract
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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This manuscript has no associated data or the data will not be deposited. [Authors’ comment:The data that support the findings of this study are available upon request from the authors].
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Acknowledgements
This work is supported by the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2023A1515011024), the National Natural Science Foundation of China (Grant Nos. 12104105 and 11104086), the Natural Science Foundation of Guangdong Province (Grant No. S2011040001908), and the Start-up Funding of Guangdong Polytechnic Normal University (Grant No. 2021SDKYA033).
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TL presents the initial idea and basic framework of this work. M. He completed the simulations and created all figures of the work under the supervision of TL, FW, and CY. Under the supervision of TL, FW, and CY, MH finished the initial manuscript. TL, KH, JZ, FW, and CY reviewed and polished the full text.
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He, M., Li, T., Huo, K. et al. Low-threshold bistable absorption in asymmetrical one-dimensional photonic crystals containing Weyl semimetal defects. Eur. Phys. J. B 96, 128 (2023). https://doi.org/10.1140/epjb/s10051-023-00598-9
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DOI: https://doi.org/10.1140/epjb/s10051-023-00598-9