Abstract
We demonstrate directional heat flux in silicon nanowires based on quasi-ballistic phonon transport property within phonon mean free path. A corrugated nanowire formed directionality of the thermal phonons and results in directional heat flux. This effect makes guiding and even focusing of heat fluxes in a certain spatial position in silicon membranes. We demonstrate routing of thermal phonons using a directional heat flux generator formed by a corrugated structure. Crossover of quasi-ballistic to diffusive phonon transport is also demonstrated by comparing a straight and serpentine nanowire structures. The series of experiments demonstrate highly advanced thermal management in semiconductors and open new possibility in the thermal engineering field.
Published Version
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