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Graphene induced tunability of the surface plasmon resonance

Speaker: 
Prof. Yang Hyunsoo
Date: 
Thu, 17/11/2011 - 10:00am to 10:45am
Location: 
Physics Conference Room, S13 M01-11/12
Event Type: 
Seminars
Abstract: Tunability of the surface plasmon resonance wavelength is demonstrated by
varying the thickness of Al2O3 spacer layer inserted between the graphene and
nanoparticles. By varying the spacer layer thickness from 0.3 to 1.8 nm, the
resonance wavelength is shifted from 583 to 566 nm. The shift is due to a change in
the electromagnetic field coupling strength between the localized surface plasmons
excited in the gold nanoparticles and a single layer graphene film. In contrast,
when the graphene film is absent from the system, no noticeable shift in the
resonance wavelength is observed upon varying the spacer thickness.

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