金属ナノ粒子への光照射によるナノスケールの空間選択的な加熱

抄録

In recent years, there has been an increasing number of reports employing the highly efficient photothermal conversion phenomenon known as "plasmonic heating," driven by metallic nanoparticles, as a driving force for optofluidic transport in the micro/nanoscale regime. Plasmonic heating refers to the phenomenon where noble metal nanoparticles with diameters ranging from 5 to 200 nm exhibit extremely efficient light absorption and subsequent heat generation due to the "localized surface plasmon resonance" effect, acting as optical antennas at the nanometer scale. In this presentation, we discuss the application of "plasmonic heating" and its potential in effectively controlling the temperature distribution in nanospaces, particularly focusing on the influence of incident light wavelength and polarization. Specifically, we have obtained numerical solutions by employing the finite element method to solve the Maxwell's equations and the steadystate heat conduction equation. The results reveal the significance of using titanium nitride as a plasmonic material, which possesses superior thermal properties compared to the commonly employed gold, for achieving enhanced plasmonic heating effects.