Ballistic Thermal Transport at Sub-10 nm Laser-Induced Hot Spots in GaN Crystal.

ABSTRACT: Ballistic thermal transport at nanoscale hotspots will greatly reduce the performance of a Gallium nitride (GaN) device when its characteristic length reaches the nanometer scale. In this work, the authors develop a tip-enhanced Raman thermometry approach to study ballistic thermal transport within the range of 10 nm in GaN, simultaneously achieving laser heating and measuring the local temperature. The Raman results show that the temperature increase from an Au-coated tip-focused hotspot up to two times higher (40 K) than that in a bare tip-focused region (20 K). To further investigate the possible mechanisms behind this temperature difference, the authors perform electromagnetic simulations to generate a highly focused heating field, and observe a highly localized optical penetration, wi

SUBMITTER: Huang D 

PROVIDER: S-EPMC9839872 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature