Innovative graphene-dielectric metasurface: harnessing bound states in the continuum for advanced THz-wave modulation and high-sensitivity sensing

• DOI: 10.1364/josab.501262
• Publication Date: 2023-09-18T19:00:11Z
• Authors: Zhexian Li; Yunping Qi; Zihao Zhou; Luo Bing; Yaqi Wang; Xiangxian Wang
• Keywords: Modulation (music); Fermi energy; Figure of Merit

We introduce a metasurface capable of generating multiple bound states in the continuum (BICs). Through rotation two LiTaO 3 columns, symmetry protection can be broken, resulting quasi-BIC with high quality factor. The multipolar analysis each BIC confirms that dominant pole aligns closely electromagnetic field. Additionally, we demonstrate tunability quasi-BIC’s factor by modifying Fermi level graphene, designing terahertz (THz)-wave modulator remarkable modulation depth more than 90% and range 36 meV, 108 30 1.2 42 meV. Furthermore, sensing performance is investigated. sensitivity peak1 measured at 0.41 THz/RIU, peak2 0.4 peak3 1.049 peak4 0.34 peak5 1.59 figure merit these BICs calculated as 455.56RIU −1 , 62.8RIU 11,655.56RIU 17,000RIU 7,950RIU respectively. Compared relevant studies, our demonstrates excellent performance. results studies have potential applications sensing, optical communication, energy harvesting, open up possibilities for efficient control manipulation waves.