Heating in plasmonic nanoantennas imaged by digital heterodyne holography

Sarah Y Suck; Ariadna Martinez-Marrades; Stephane Collin; Nathalie Bardou; Yannick De Wilde; Gilles Tessier

META 2021, META'12

Sarah Y Suck, Ariadna Martinez-Marrades, Stephane Collin, Nathalie Bardou, Yannick De Wilde, Gilles Tessier

Last modified: 2012-01-03

Abstract

We report a method based on heterodyne numerical holography associated to photothermal excitation for full field imaging of heating in plasmonic systems. A modulated pump laser (l=532 nm) heats the nanostructures, creating local refractive index changes. This modulation is detected using a probe and a local oscillator beam (l=785 nm), frequency-shifted to create a hologram beating at low frequency. The possibilities of this non-contact full field imaging method, which delivers signals directly proportional to the local temperature increase induced by dissipative phenomena, will be illustrated on nanodisc chains and rod pairs.

Keywords

Plasmonic, thermo plasmonics, Digital holography