期刊
OPTICS EXPRESS
卷 17, 期 18, 页码 15652-15658出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.015652
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资金
- KOSEF
- KRF
- MKE
- Seoul R BD program
- National Research Foundation of Korea [2008-0057473, 2008-0062255, 2006-312-C00504, 2007-2002939] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We present a simple theoretical model to study the effect of a substrate on the resonance of an aperture in a thin metal film. The transmitted energy through an aperture is shown to be governed by the coupling of aperture waveguide mode to the incoming and the outgoing electromagnetic waves into the substrate region. Aperture resonance in the energy transmission thus depends critically on the refractive index of a substrate. We explain the substrate effect on aperture resonance in terms of destructive interference among evanescent modes or impedance mismatch. Our model shows an excellent agreement with a rigorous FDTD calculation and is consistent with previous experimental observations. (C) 2009 Optical Society of America
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