Home – Home – Jornals – Avtometriya 2023 number 1

Under the action of light in plasmon resonance conditions, metal nanoparticles induce heat at the nanoscale. This effect forms the basis for thermoplasmon probing of phase changes occurring in nanoscale systems, the study of which is a key task in modern material science. Despite the obvious simplicity of this approach, enhanced absorption of light by resonant nanostructures does not guarantee the desired optical heating in cases where the thermal conductivity of the medium significantly exceeds the thermal conductivity of the plasmonic nanostructure. We propose an approach for creating controlled heating of plasmonic nanostructures by nanostructuring the surface of a thermostat, which is demonstrated using a thermoplasmonic metasurface, which is an array of TiN:Si voxels - a vertical system of titanium nitride (TiN) and silicon (Si) nanostructures on a silicon substrate. Plasmonic TiN nanostructures play the role of nanoheaters, and varying the height of silicon heat conductor makes it possible to control the temperature of heating of voxels at a fixed value of the pump intensity by controlling heat localization. A possibility of probing phase transitions in nanoscale systems is demonstrated by an example of thin polymer films using a thermoplasmonic metasurface and Raman spectroscopy.