Nanoscale Heat Flow and Thermometry in Laser-Heated Resonant Silicon Mie Nanospheres Probed with Spatially Resolved Cathodoluminescence Spectroscopy.

ABSTRACT: Many nanoscale technologies depend critically on precise knowledge and control of local temperature and heat flow, making robust nanothermometry essential for designing, optimizing, and ensuring the reliability of next-generation devices. In this work, we introduce a correlative method that combines laser excitation with scanning electron microscopy-based cathodoluminescence (SEM-CL) to probe photothermal effects in situ with nanoscale spatial resolution. We analyze the spatially resolved CL (30 keV) of resonant Mie modes in single silicon nanoparticles under continuous-wave laser irradiation (λ = 442 nm). The 235-250-nm-diameter crystalline nanospheres, placed on a Si₃N₄ membrane, show a strong electric quadrupole CL resonance of which the peak wavelength reve

SUBMITTER: Fiedler S 

PROVIDER: S-EPMC12532368 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature