This work describes the design of a new plasmonic device made of gold nanoparticles separated from a gold film
through a thermoresponsive polymer layer. This organic polymer responds to temperature variations by conformational
changes (with a characteristic temperature called the lower critical solution temperature, LCST) and is therefore able to
vary the distance between the gold nanoparticles and the gold film. The optical properties of these stimulable substrates
were probed by Surface Enhanced Raman Scattering spectroscopy (SERS) using methylene blue (MB) as a molecular
probe. We show that an increase of the external temperature reversibly induces a significant enhancement of the MB
SERS signal. This was attributed to a stronger interaction between the gold nanoparticles and the gold substrate. The
temperature-responsive plasmonic devices developed in this work thus provide a dynamic SERS platform, with thermally switchable electromagnetic coupling between the gold nanoparticles and the gold surface.