Journal
OPTICS LETTERS
Volume 36, Issue 9, Pages 1704-1706Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.001704
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Funding
- United States Department of Defense National Security Science and Engineering Faculty [N00244-09-1-0013]
- National Science Foundation (NSF) [EEC-0812072, ECCS-1002160]
- National Natural Science Foundation of China (NSFC) [61071084]
- State Key Laboratory of Advanced Optical Communication Systems and Networks, China
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We present a simple analytic formalism to explain the unique resonance phenomenon in subwavelength high-contrast gratings (HCG). We show that the resonances are due to strong coupling between two surface-normal waveguide array modes resulting from abrupt and large index contrast. Simple expression for HCG quality factor is derived that agrees with spectral-fitting approaches reported in literature. (C) 2011 Optical Society of America
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