期刊
OPTICS EXPRESS
卷 24, 期 18, 页码 20080-20088出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.020080
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资金
- Osaka University International Joint Research Promotion Program, the Handai project
- Grants-in-Aid for Scientific Research [16K04979] Funding Source: KAKEN
We provide an overview of Fano resonance and plasmon induced transparency (PIT) as well as on plasmons coupling in planar structures, and we discuss their application in sensing and enhanced spectroscopy. Metal-insulator-metal (MIM) structures, which are known to support symmetric and anti-symmetric surface plasmon polaritons (SPPs) arising from the coupling between two SPPs at the metal-insulator interfaces, exhibit anticrossing behavior of the dispersion relations arising from the coupling of the symmetric SPP and the metal/air SPP. Multilayer structures, formed by a metal film and a high-index dielectric waveguide (WG), separated by a low-index dielectric spacer layer, give narrow resonances of PIT and Fano line shapes. An optimized Fano structure shows a giant field intensity enhancement value of 10(6) in air at the surface of the high-index dielectric WG. The calculated field enhancement factor and the figure of merit for the sensitivity of the Fano structure in air can be 10(4) times as large as those of the conventional surface plasmon resonance and WG sensors. (C) 2016 Optical Society of America
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