Dual-controllable Plasmon-induced Transparency Based on Active Borophene Metasurface in the Near-infrared Region

• Published in: Plasmonics (Norwell, Mass.) Vol. 18; no. 2; pp. 761 - 768
• Main Authors: Zhang, Hui, Wu, Ao, Xiao, Kunpeng, Huang, Xincheng, Jiang, Huan, Zhao, Weiren
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2023; Springer Nature B.V
• Subjects: Amplitude modulation; Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Borophene; Broadband; Chemistry; Chemistry and Materials Science; Controllability; Electron density; Group delay; Metasurfaces; Nanoribbons; Nanotechnology; Plasmonics; Plasmons; Resonance; Borophene; Metasurface; Slow light; Plasmon-induced transparency
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-023-01801-4

A tunable and switchable plasmon-induced transparency (PIT) effect in the near-infrared region (NIR) is achieved in a borophene-based metasurface, which consists of a periodic array of parallel double-layer borophene nanoribbons (BNRs). The upper- and lower-layer BNRs fulfill two plasmonic bright modes exciting and coupling for PIT phenomenon generation. By changing borophene electron density, the PIT window can be not only tuned to varying resonance frequency, but also adjusted for switching modulation. The calculation results reveal that as the electron density increases from 2.4 × 10 19 to 5.6 × 10 19  m −2 , the PIT resonance frequency correspondingly shifts from 150 to 220 THz, and a maximum amplitude modulation depth (MD) of the PIT window reaches 98.3% at 193.55 THz ( λ = 1.55 μ m ). Moreover, the slow light characteristics of the proposed metasurface are analyzed in detail using the well-controlled group delay. Such a switchable and broadband tunable metadevice can expand the applications for PIT effect in active slow light, plasmonic sensing, and optical modulator areas.