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http://hdl.handle.net/10397/107032
Title: | Tunable flatband plasmonic quasi-bound states in the continuum based on graphene-assisted metasurfaces | Authors: | Wang, Z Wang, Y Cheng, Z Qu, J Cui, M Huang, D Yu, C |
Issue Date: | 18-Sep-2023 | Source: | Applied physics letters, 18 Sept 2023, v. 123, no. 12, 121703 | Abstract: | Bound states in the continuum (BICs) of plasmonic systems offer a powerful method for enhancing light–matter interaction at the nanoscale. The recent emergence of flatband quasi-BICs has alleviated the limitation of the incident angle of the excitation light on generating high-quality-factor (high-Q-factor) resonances, which makes it feasible to produce substantial near-field enhancement by focused light. However, the current works are limited to passive systems with fixed amplitude and Q-factor, hindering the dynamic tunability of light field enhancement. Here, we design a plasmonic metasurface integrated with monolayer graphene to achieve tunable flatband quasi-BICs. Under the illumination of a tightly focused transverse-magnetic wave, our simulations show that adjusting the chemical potential of graphene can increase Q-factor from 52.5 to 75.9 and improve absorption amplitude from 81% to 95%. These results pave the way for dynamically adjustable near-field enhancement with tightly focused light. | Publisher: | AIP Publishing LLC | Journal: | Applied physics letters | ISSN: | 0003-6951 | EISSN: | 1077-3118 | DOI: | 10.1063/5.0166140 | Rights: | © 2023 Author(s). Published under an exclusive license by AIP Publishing. This is the accepted version of the publication. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Zhuo Wang, Yue Wang, Zhi Cheng, Jiaqi Qu, Mingjie Cui, Dongmei Huang, Changyuan Yu; Tunable flatband plasmonic quasi-bound states in the continuum based on graphene-assisted metasurfaces. Appl. Phys. Lett. 18 September 2023; 123 (12): 121703 and may be found at https://doi.org/10.1063/5.0166140. |
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