Analogue of electromagnetically induced transparency in all-dielectric metasurface induced by quasi-bound state in the continuum for switching. Issue 11 (25th June 2022)

• Record Type: Journal Article
• Authors: Yang, Jinfeng; Shang, Jifang; Wang, Wudeng
• Is Part Of: Journal of modern optics. Volume 69:Issue 11(2022)
• Page Start: 645
• Page End: 652
• Publication Date: 2022-06-25
• Subjects: Dielectric metasurface -- symmetry breaking -- switching; Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2022.2073392
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract : We design and numerically investigate an all-dielectric metasurface composed of ring/disk cavity supporting quasi-bound state in the continuum (BIC) by breaking the in-plane symmetry of the cavity through removing a part from the edge of the central disk that invokes a leakage channel in the form of weakly radiating electromagnetically induced transparency. Far-field radiations and near-field distributions explain the evolution from BIC to quasi-BIC and further point out the dominant magnetic quadrupole component in quasi-BIC. Such quasi-BIC can be switched on and off at orthogonal polarizations and modulated by the intrinsic material loss. Further, we compare the effects of quasi-BICs excited by the offset and removing a part from the edge of the central disk on Q-factors and near-field enhancement, which can be tailored and optimized by selecting the appropriate degree and way of asymmetry.