Optical scattering of colloidal Au supported on various substrates and the effect of buffer layers between them

Title
Optical scattering of colloidal Au supported on various substrates and the effect of buffer layers between them
Authors
김주영조규만이택성김원목이경석
Keywords
Colloidal Au; Substrate; Plasmonics
Issue Date
2010-08
Publisher
IEEE Nano 2010
Abstract
Metallic nanostructures have great potential for bio-chemical sensor applications due to the excitation of localized surface plasmon and its sensitive response to environmental change. The optical properties of the localized surface plasmon strongly depend on the size, shape, metal composition, and the local environment [1-2]. The properties are influenced by the substrate that supports the metallic nanostructure, as well. The substrate materials can be classified into the transparent dielectric, the absorptive semiconductor, and the reflective metal. The materials selection for the substrate has been reported to have an effect in a different way on the plasmonic properties of metal nanostructure supported on it. Unlike the dielectric, it has been known that the semiconductor induces a damping of plasmon due to the energy loss by absorption, and the metal substrates give rise to an additional hybridized mode from the interaction with the free electrons on the metal surface [3]. We investigate the effect of substrate more systematically by controlling the extent that the local electric field of metal nanostructure feels the substrate, which can be modified by the distance to the substrate and the decay length of metal nanostructure itself. The optical scattering was analyzed as a function of the key controlling factor mentioned above using a dark field spectroscopy.
URI
http://pubs.kist.re.kr/handle/201004/38682
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KIST Publication > Conference Paper
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