Open AccessTailoring the plasmon-induced transparency resonances in terahertz metamaterials
Author(s) -
Meng Li,
Zhen Tian,
Xueqian Zhang,
Jianqiang Gu,
Chunmei Ouyang,
Jiaguang Han,
Weili Zhang
Publication year - 2017
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.25.019844
Subject(s) - metamaterial , split ring resonator , optics , terahertz radiation , polarization (electrochemistry) , plasmon , resonator , materials science , electric field , wavelength , optoelectronics , planar , electromagnetically induced transparency , physics , chemistry , computer graphics (images) , quantum mechanics , computer science
We experimentally demonstrate that a coupled metamaterial composed of sub-wavelength split-ring-resonators (SRRs) and closed-ring-resonators (CRRs) can tailor the plasmon-induced-transparency (PIT) resonances when the external electric field is parallel to the gaps of SRRs. Rotating or moving SRRs in vertical direction plays a critical role in the EIT functionality, while an excellent robust performance can be acquired via moving SRRs in the horizontal direction. Based on the results, a polarization-independent and polarization-dependent planar metamaterial are designed, fabricated and measured. In contrast to the spectral property of the polarization-independent medium, the polarization-dependent one is featured by isolated PIT phenomena in the frequency-domain, with respect to the horizontal and vertical polarized incident beam. Transmission responses of the PIT metamaterial are characterized with terahertz time-domain spectroscopy, showing a good agreement with the rigorous numerical simulation results. The presented work delivers a unique way to excite and modulate the PIT response, toward developing polarization-independent and polarization-dependent slow-light building blocks, ultrasensitive sensors and narrow-band filters functioning in the THz regime.