Journal
OPTICS EXPRESS
Volume 25, Issue 17, Pages 19844-19855Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.019844
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Funding
- National Key Basic Research Program of China [2014CB339800]
- National Science Foundation of China [61675145, 61422509, 61605143, 61420106006]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13033]
- Major National Development Project of Scienti(sic)c Instruments and Equipment [2011YQ150021]
- Specialized Research Fund for the Doctoral Program of Higher Education [20110032120058]
- U.S. National Science Foundation [ECCS-1232081]
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We experimentally demonstrate that a coupled metamaterial composed of subwavelength 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. (C) 2017 Optical Society of America
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