期刊
OPTICS EXPRESS
卷 20, 期 21, 页码 24002-24009出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.20.024002
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资金
- Priority Research Center program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2011-0031392, 2011-0017605]
- NRF
- ICT Standardization program of KCC
- PAL, Korea
- National Research Foundation of Korea [2011-0017605, 2008-0059038, 과09A1113, 2009-0094023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Magnetic resonance is considered to be a necessary condition for metamaterial perfect absorbers, and dual-band absorbers can be composed of a pair of metallic layers with anti-parallel surface currents. We designed and fabricated a tunable dual-band perfect absorber based on extraordinary-optical-transmission (EOT) effect and Fabry-Perot cavity resonance. The idea and the mechanism are completely different from the absorber based on the near-field interaction. The important advantage of our structure is that we can switch a single-band absorber to a dual-band absorber by changing the distance between two metallic layers and/or incident angle. The peak originating from the EOT effect becomes significantly narrower, resulting in an increase of the Q-factor from 16.88 to 49. The dual-band absorber can be optimized to be insensitive to the polarization of the incident electromagnetic wave by slightly modifying the absorber structure. (C) 2012 Optical Society of America
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