Open AccessTunable chiroptical response of graphene achiral metamaterials in mid-infrared regime
Author(s) -
Shaoen Zhou,
Pengtao Lai,
Guohua Dong,
Ping Li,
Yuxiang Li,
Zheng Zhu,
Chunying Guan,
Jinhui Shi
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.015359
Subject(s) - metamaterial , graphene , polarizer , terahertz radiation , materials science , optics , optoelectronics , infrared , split ring resonator , fermi energy , chirality (physics) , circular dichroism , photonic metamaterial , physics , nanotechnology , symmetry breaking , birefringence , chemistry , chiral symmetry breaking , quantum mechanics , nambu–jona lasinio model , crystallography , electron
We numerically investigate a tunable and extrinsic chiroptical response of a graphene achiral metamaterial in mid-infrared regime. The achiral metamaterial is composed of cascaded metallic split ring apertures and complementary graphene rings patterned on a dielectric layer. The strong extrinsic chiroptical responses of the metamaterial are allowed at oblique incidence and the integrated graphene can dynamically modulate extrinsic chirality by changing its Fermi level. The spectra of the chiroptical responses will show a blue shift with increasing the Fermi level of the patterned graphene. The maximal values of circular dichroism in the reflection and transmission modes can reach 80% and 50%, respectively. The maximal values of polarization rotation angle in the reflection and transmission modes can reach 80° and 60°, respectively. This graphene-based metamaterial design paves a way for a myriad of important terahertz (THz) and mid-infrared applications, such as optical modulators, absorbers and polarizers.