Optical scattering of colloidal Au supported on various substrates and the effect of buffer layers between them
- Optical scattering of colloidal Au supported on various substrates and the effect of buffer layers between them
- 김주영; 조규만; 이택성; 김원목; 이경석
- Colloidal Au; Substrate; Plasmonics
- Issue Date
- IEEE Nano 2010
- 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 .
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.
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