Single Molecule Raman Detection with a Composite Microresonator and Metal Nanocavity System

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Single Molecule Raman Detection with a Composite
Microresonator and Metal Nanocavity System
Xudong Fan (University of Missouri Columbia)
Concept Raman signal is enhanced
multiplicatively by both metal nanoclusters and a
ring resonator. Based on this, a liquid Raman
laser with an ultralow threshold can be
achieved. LCORR Liquid Core Optical Ring
Resonator
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Experimental Setup
785 nm laser
sample
Fiber probe
To spectrometer
Fiber taper or waveguide
LCORR
photodetector
(A)
(B)
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Raman laser
Gain medium carbon disulfide Excitation 785 nm
We have achieved Raman laser in carbon disulfide
is flowed through the LCORR. Our next step will
be to add silver nanoclusters to enhance the
Raman scattering. The lasing threshold is
expected to much lower.