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Title: Resonance coupling and polarization conversion in terahertz metasurfaces with twisted split-ring resonator pairs

Here, we investigate edge-coupling of twisted split-ring resonator (SRR) pairs in the terahertz (THz) frequency range. By 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.
Authors:
 [1] ; ORCiD logo [2] ;  [1] ;  [1] ; ORCiD logo [2]
  1. Captial Normal Univ., Beijing (China). Key Lab. of Terahertz Optoelectronics, Advanced Innovation Center for Imaging Technology
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
Publication Date:
Report Number(s):
LA-UR-17-27850
Journal ID: ISSN 1094-4087; OPEXFF
Grant/Contract Number:
AC52-06NA25396; 11574219
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 21; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1398836
Alternate Identifier(s):
OSTI ID: 1406233