Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-016-0013-x
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Funding
- Spanish MINECO [MAT2014-59096-P, SEV2015-0522]
- AGAUR [2014 SGR 1400]
- Fundacio Privada Cellex
- European Commission [CNECT-ICT-604391, FP7-ICT-2013-613024-GRASP]
- Dept. of Physics and Astronomy of the University of New Mexico
- College of Arts and Sciences of the University of New Mexico
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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.
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