Open AccessTunable asymmetric spin splitting by black phosphorus sandwiched epsilon-near-zero-metamaterial in the terahertz region
Author(s) -
Yuechuan Lin,
Xiaohe Liu,
Huifeng Chen,
Xinyi Guo,
Jintao Pan,
Jianhui Yu,
Hongfei Zheng,
Heyuan Guan,
Huihui Lu,
Yi Zhong,
Yaofei Chen,
Yunhan Luo,
Zhe Chen
Publication year - 2019
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.27.015868
Subject(s) - terahertz radiation , metamaterial , condensed matter physics , spin (aerodynamics) , optics , quantum tunnelling , photonic crystal , materials science , optoelectronics , physics , thermodynamics
In-plane photonic spin splitting effect is investigated in tunneling terahertz waves through an epsilon-near-zero metamaterial sandwiched between monolayer black phosphorus (BP). The strong in-plane anisotropy of BP layers will induce in-plane asymmetric spin splitting. The asymmetric spin splitting can be flexibly tuned by the angles between the incident plane and the armchair crystalline directions of the top and bottom BP layers, i.e., ϕ 1 and ϕ 2 . Based on this, an angle-resolved barcode-encryption scheme is discussed. For the special case of ϕ 1 = ϕ 2 = 0 or 90°, the transmitted beam undergoes Goos-Hänchen shift, which varies with the carrier density of BP. We believe these findings can facilitate the development of novel optoelectronic devices in the Terahertz region.