期刊
OPTICS EXPRESS
卷 18, 期 4, 页码 3546-3555出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.003546
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资金
- State Key Program for Basic Research of China
- NSFC [10734010, 50771054, 10804044]
- RFDP
An enhanced dielectric environment response is observed in a kind of metallic nanohole arrays which are prepared by metal deposition on a sacrificial two dimensional colloidal crystal template. The periodic metallic structures are composed of interlinked metallic half-shells supported on a planar dielectric substrate. When putting in dielectric matrix of different refractive index, the measured sensitivity of the quasi-three-dimensional metallic nanohole array can reach a value of 1192 nm per refractive index unit which shows a five-fold increase as compared with the metallic structures supported on the template. The observed boost in sensitivity is found to originate from a substantially reduced substrate effect, resulting in a pronounced surface plasmon coupling of which its strength is independent of the dielectric environment, a characteristics absent in conventional planar metallic subwavelength hole arrays. These findings are analyzed theoretically and confirmed by numerical simulations. (C) 2009 Optical Society of America
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