Ultrafast radiative heat transfer (Conference Presentation)

Renwen Yu; Alejandro Manjavacas; Javier García de Abajo

doi:10.1117/12.2273415

19 October 2017 Ultrafast radiative heat transfer (Conference Presentation)

Renwen Yu, Alejandro Manjavacas, Javier García de Abajo

Proceedings Volume 10345, Active Photonic Platforms IX; 103450X (2017) https://doi.org/10.1117/12.2273415
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Renwen Yu, Alejandro Manjavacas, and Javier García de Abajo "Ultrafast radiative heat transfer (Conference Presentation)", Proc. SPIE 10345, Active Photonic Platforms IX, 103450X (19 October 2017); https://doi.org/10.1117/12.2273415

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