Tunable Plasmon-Induced Transparency with Ultra-Broadband in Dirac Semimetal Metamaterials

• Published in: Plasmonics (Norwell, Mass.) Vol. 14; no. 6; pp. 1717 - 1723
• Main Authors: Liu, Yongliang, Du, Yuning, Liu, Wenqian, Shen, Sanmin, Tan, Qiulin, Xiong, Jijun, Zhang, Wendong
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2019; Springer Nature B.V
• Subjects: Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Brightening; Broadband; Chemistry; Chemistry and Materials Science; Computer simulation; Dipole interactions; Group delay; Magnetic dipoles; Metamaterials; Nanotechnology; Temperature effects; Terahertz frequencies; Dirac semimetal; Terahertz; Plasmon-induced transparency; Metamaterial
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-019-00967-0

We proposed a numerical and theoretical research on the realization of the tunable plasmon-induced transparency (PIT) with ultra-broadband at terahertz frequencies in Dirac semimetal metamaterials. The effect of temperature on the PIT window was analyzed simultaneously. The magnetic dipole coupling between “bright mode” and “dark mode” leads to a novel PIT optical response. Simulation results show that the maximum bandwidth of PIT window can be increased to 426 GHz and 393 GHz by adjusting the dimensions of d 1 and d 2 in the Dirac asymmetrical structure, respectively. Moreover, we can dynamically tune the PIT window frequency from 1.257 to 1.508 THz by adjusting the Fermi energy from 70 to 90 meV. Furthermore, a positive group delay of about 0.75 ps can be obtained by varying the Fermi energy in the proposed structure. These results will bring a variety of potential applications in terahertz field.