Open AccessResonance coupling and polarization conversion in terahertz metasurfaces with twisted split-ring resonator pairs
Author(s) -
Chenyu Li,
Chun Chieh Chang,
Qingli Zhou,
Cunlin Zhang,
Hou-Tong Chen
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.25.025842
Subject(s) - metamaterial , terahertz radiation , split ring resonator , resonator , optics , resonance (particle physics) , polarization (electrochemistry) , ground plane , bandwidth (computing) , materials science , coupling (piping) , optoelectronics , physics , telecommunications , atomic physics , computer science , chemistry , antenna (radio) , metallurgy
We investigate edge-coupling of twisted split-ring resonator (SRR) pairs in the terahertz (THz) frequency range. Using a simple coupled-resonator model we show that such a system exhibits resonance splitting and cross-polarization conversion. Numerical simulations and experimental measurements agree well with theoretical calculations, verifying the resonance splitting as a function of the coupling strength given by the SRR separation. We further show that a metal ground plane can be integrated to significantly enhance the resonance coupling, which enables the effective control of resonance splitting and the efficiency and bandwidth of the cross-polarization conversion. Our findings improve the fundamental understanding of metamaterials with a view of accomplishing metamaterial functionalities with enhanced performance, which is of great interest in realizing THz functional devices required in a variety of applications.