High-contrast tunable unidirectional reflectionless phenomenon near the exceptional points in integrated bulk Dirac semimetal waveguide. (27th August 2021)

• Record Type: Journal Article
• Authors: Wu, Zhuolin; Zeng, Yi; Liu, Guidong; Wang, Ling-Ling; Lin, Qi
• Is Part Of: Applied physics express. Volume 14:Number 9(2021)
• Publication Date: 2021-08-27
• Subjects: Plasmonics -- Waveguides -- Bulk Dirac semimetals; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/ac1ca5
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We realize the unidirectional reflectionless light propagation in metal-insulator-metal plasmonic waveguide side-coupled with two resonators based on bulk Dirac semimetal (BDS). This phenomenon is observed at exceptional points where the parity-time symmetry is broken, and near perfect absorption is obtained. Based on the dynamic tunability of BDS, the ultra-compact structure with adjustable unidirectional reflectionlessness can be achieved due to low scattering loss. Our results show a potential for developing integrated plasmonic devices such as active mid-infrared sensors, diodes, and absorbers.