Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4893275
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [26289013, 25630019]
- Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [14J09884, 25630019, 26289013, 23686053] Funding Source: KAKEN
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The sensing characteristics of an independent-plasmonic-cavity structure that traps light were investigated. The cavity structure traps light by generating self-contained optical vortices in each independent cavity without leakage or propagation of the light; therefore, strong and sharp resonance dips are obtained in a reflectance spectrum. Multiple optical vortices are generated in the independent cavities in higher-order plasmonic cavity modes at shorter wavelengths, realizing the resonance in a wide range from visible to near-infrared. Compared to the propagating surface plasmon resonance, the resonance of plasmonic cavity mode in the independent cavity does not depend on variation of the incident angle of light. The independent-cavity structure was fabricated by a simple process, and it experimentally demonstrated a high sensitivity (above 1500 nm per refractive index unit) and a figure of merit above 20. (C) 2014 AIP Publishing LLC.
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