Plenary Lecture

Plasmonic Remote Single-molecule Fluorescence and Raman Spectroscopy: Toward Single Cell Interrogations

Professor Hiroshi Uji-i
Department of Chemistry
KU Leuven
Heverlee, Belgium
RIES, Hokkaido University
Sapporo, Japan

Abstract: Metal nanowires can be used as plascmonic wave-guides, allowing the spatial confinement and transfer light energy over micrometer distance below sub-diffraction limited dimention. Plasmons confined at the surface of single metal nanowires, such as wet-chemically synthesized silver/gold nanowires, can propagate over tens of microns before energy is lost by Ohmic damping. Alternatively, the use of surface plasmons allows us to concentrate light energy in nanometer regions, leading to a massive enhancement of electromagnetic filed that can be used for surface enhanced Raman scattering (SERS) or fluorescence (SEF) spectroscopy/microscopy.
In this talk, I will introduce a noble nanoscopic techniques using a combination of these two concept, that of surface enhanced Raman scattering (SERS) and surface enhanced fluorescence of (bio)molecules and that of sub-diffraction limit plasmonic waveguiding. Specifically, we demonstrate that propagating plasmons launched along a silver nanowire (50 ~ 100 nm diameter) can remotely excite SERS and SEF in the vicinity of the nanowire surface due to the SPPs wave-guiding effect. The ability to transfer SERS/SEF excitation over several microns, through sub-diffraction limited structures, will be discussed with respect to potential application toward super-resolution endoscopy and tip-enhanced Raman microscopy.

Brief Biography of the Speaker: TBA

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