Nanoimprinted plasmonic nanocavity arrays

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We demonstrate high resonant absorption of visible light with a plasmonic nanocavity chain structure fabricated through resistless nanoimprinting in metal (RNIM). The RNIM approach provides a simple, reproducible, and accurate means to fabricate metallic nanopatterns with high fidelity. The nanocavities are shown to be efficiently excited using normally incident light, and the resonant wavelength can be controlled by either the width or the depth of the cavity. Numerical simulations confirm the experimental observations, and illustrate the behavior of the nanocavity chain waveguide and insensitivity to incident angle. The resonant absorption is due to the excitation of a localized metal-insulator-metal cavity mode. The interacting surface waves allow cavity lengths on the order of ten nanometers for light having a free space wavelength of about four hundred nanometers. Coupling of the cavities with an intervening surface plasmon wave results in a collective excitation and a chain waveguide mode that should prove valuable for more sensitive detection based on surface enhanced Raman scattering. (C) 2013 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2013-07
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.21, no.13, pp.15081 - 15089

ISSN
1094-4087
DOI
10.1364/OE.21.015081
URI
http://hdl.handle.net/10203/298529
Appears in Collection
EE-Journal Papers(저널논문)
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