Highly tunable dual bound states in the continuum in bulk Dirac semimetal metasurface. (10th March 2021)

• Record Type: Journal Article
• Authors: Ma, Changchun; Lin, Qi; Wang, Lingling; Huang, Kai
• Is Part Of: Applied physics express. Volume 14:Number 4(2021)
• Publication Date: 2021-03-10
• Subjects: Bound states in the continuum -- Bulk Dirac semimetal -- Metasurface -- Tunable device; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/abe98d
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We present a bulk Dirac semimetal (BDS) metasurface to realize tunable dual bound states in the continuums (BICs). The dual polarization-dependent BICs can transform into quasi-BICs with EIT or Fano lineshapes by breaking the structural symmetry. The excitation of quasi-BICs can attribute to the coupling between magnetic quadrupole mode and electric dipole mode (quasi-BIC I), or the coupling of two magnetic quadrupole modes (quasi-BIC II). The BIC resonant wavelength can be dynamically tuned while maintaining the spectral lineshape by varying the Fermi energy of BDS without re-optimizing the geometrical structures, which provides a new route for ultra-compact active BIC device.