Dual quasi-bound states in the continuum in graphene/dielectric hybrid metamaterial from out-of-plane symmetry protection. Issue 4 (23rd February 2022)

• Record Type: Journal Article
• Authors: Wang, Wudeng; Yan, Huizhen; Xiong, Li; Zhang, Yujie; Bi, Xiuguo
• Is Part Of: Journal of modern optics. Volume 69:Issue 4(2022)
• Page Start: 225
• Page End: 231
• Publication Date: 2022-02-23
• Subjects: Bound states in the continuum -- dielectric metamaterial -- graphene -- resonator; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2021.2024612
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract : In this work, we design and numerically investigate dual quasi-bound states in the continuum (quasi-BICs) in all-dielectric metamaterial consisting of a silicon stair-like resonator by breaking the symmetry in the direction perpendicular to the metamaterials. By introducing this unique degree of freedom beyond the in-plane symmetry, one can observe the evolution from BICs to quasi-BICs and efficiently control the Q-factors and frequencies of quasi-BICs. The charge density distribution, far-field radiations and near-field distributions demonstrate the dominant electric quadrupole responses in such two quasi-BICs. Further, we examine actively tunable response of such two quasi-BICs with respect to a change in the Fermi energy of graphene layer, indicating the potential applications in designing quasi-BIC-based modulators, filters and sensors.