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Enabling sensing technology with plasmonics

Thursday, March 16, 2017 - 12:00
Place: 
Donostia International Physics Center
Who: 
François Lagugné-Labarthet. Western University, London, Ontario, Canada
Source Name: 
DIPC

The use of efficient sensing technologies
appears to be a field with tremendous activity mainly due to the connectivity
of sensing devices on global network (internet of things and services) enabling
immediate sharing of information valuable in a variety of fields such as
industrial processes, food quality control, environmental monitoring and
biomedical assessment. In this context the development of optical sensing
devices appears to provide advantages such as high portability (small
footprint, little sample preparation) and, in ideal conditions, an excellent
specificity of detection.

Our group aim at developing metamaterials
interfaced with spectroscopy and optical methods to enhance the detection of a
variety of materials and biomaterials using advanced nano- and micro-scales optical
imaging. Specifically, plasmon-mediated enhancements are used to further
facilitate i)-the increase of surface-sensitivity of spectroscopic measurements
and to ii)- increase local spatial resolution of the optical measurement beyond
the diffraction limit.

In this seminar, we will review several research
directions led in our group including the design and fabrication of advanced
surface-enhanced platforms for Raman and Infrared measurements,1,2
development of Tip-enhanced Raman spectroscopy to probe biological processes at
a sub 10 nm scale,3 and the extension of plasmon-mediated sensing to
nonlinear optical processes such as second harmonic generation.4

1 M. Tabatabaei et al., Chemical Science, 2016, 7, 575-582.

2 G.Wallace et al. ACS Photonics, 2016, 3, 1723-1732

3 F. Pashaee et al.,  Analyst, 2016, 141,
3251-3258.

4 R. Hou et al., Phys. Chem. Chem. Phys., 2016, 18, 7956-7965.

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