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Proceedings Paper

Ultrafast radiative heat transfer (Conference Presentation)
Author(s): Renwen Yu; Alejandro Manjavacas; Javier García de Abajo

Paper Abstract

Light absorption in conducting materials produces heating of their conduction electrons, followed by relaxation into phonons within picoseconds, and subsequent diffusion into the surrounding media over longer timescales. This conventional picture of optical heating is supplemented by radiative cooling, which typically takes place at an even lower pace, only becoming relevant for structures held in vacuum or under extreme thermal isolation. Here, we reveal an ultrafast radiative cooling regime between neighboring plasmon-supporting graphene nanostructures in which noncontact heat transfer becomes a dominant channel. We predict that more than 50% of the electronic heat energy deposited on a graphene disk can be transferred to a neighboring nanoisland within a femtosecond timescale. This phenomenon is facilitated by the combination of low electronic heat capacity and large plasmonic field concentration in doped graphene. Similar effects should occur in other van der Waals materials, thus opening an unexplored avenue toward efficient heat management.

Paper Details

Date Published: 19 October 2017
Proc. SPIE 10345, Active Photonic Platforms IX, 103450X (19 October 2017); doi: 10.1117/12.2273415
Show Author Affiliations
Renwen Yu, ICFO - Institut de Ciències Fotòniques (Spain)
The Barcelona Institute of Science and Technology (Spain)
Alejandro Manjavacas, The Univ. of New Mexico (United States)
Javier García de Abajo, ICFO - Institut de Ciències Fotòniques (Spain)
The Barcelona Institute of Science and Technology (Spain)
ICREA-Institució Catalana de Recerca i Estudis Avançats (Spain)

Published in SPIE Proceedings Vol. 10345:
Active Photonic Platforms IX
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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