Open AccessPlasmon induced transparency effect through alternately coupled resonators in terahertz metamaterial
Author(s) -
Koijam Monika Devi,
Amarendra K. Sarma,
Dibakar Roy Chowdhury,
Gagan Kumar
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.25.010484
Subject(s) - metamaterial , terahertz radiation , resonator , optics , split ring resonator , plasmon , planar , materials science , polarization (electrochemistry) , optoelectronics , electromagnetically induced transparency , physics , chemistry , computer graphics (images) , computer science
We analyze plasmon induced transparency (PIT) in a planar terahertz metamaterial comprising of two C-shaped resonators and a cut-wire. The two C-shaped resonators are placed alternately on both sides of the cut-wire such that it exhibits a PIT effect when coupled with the cut wire. We have further shown that the PIT window is modulated by displacing the C-shaped resonators w.r.t. the cut-wire. A lumped element equivalent circuit model is reported to explain the numerical observations for different coupling configurations. The PIT effect is further explored in a metamaterial comprising of a cross like structure and four C-shaped resonators. For this configuration, the PIT effect is studied for the incident light polarized in both x and y directions. It is observed that such a structure exhibits equally strong PIT effects for both the incident polarizations, indicating a polarization independent response to the incident terahertz radiation. Our study could be significant in the development of slow light devices and polarization independent sensing applications.