Journal
OPTICS EXPRESS
Volume 25, Issue 26, Pages 32540-32549Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.032540
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Funding
- National Science Foundation (NSF) [ECCS-1541959, ECCS-1710273, ECCS-1709200]
- NASA Ohio Space Grant [NNX15AL50H]
- Air Force Office of Scientific Research [FA9550-16-1-0346]
- NASA [NNX15AL50H, 807596] Funding Source: Federal RePORTER
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We report the polarization-dependent electromagnetic response from a series of novel terahertz (THz) metasurfaces where asymmetry is introduced through the displacement of two adjacent metallic arms separated by a distance delta. For all polarization states, the symmetric metasurface exhibits a low quality (Q) factor fundamental dipole mode. By breaking the symmetry, we experimentally observe a secondary dipole-like mode with a Q factor nearly 9 x higher than the fundamental resonance. As ffi increases, the fundamental dipole mode f(1) redshifts and the secondary mode f(2) blueshifts creating a highly transmissive spectral window. Polarization-dependent measurements reveal a full suppression of f(2) for all asymmetries at theta >= 60 degrees. Furthermore, at delta >= 60 mu m, we observe a polarization selective electromagnetic induced transparency (EIT) for the fundamental mode. This work paves the way for applications in filtering, sensing and slow-light devices common to other high Q factor THz metasurfaces with EIT-like response. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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