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Dynamic optical control of near-field radiative transfer

Kou, Junlong and Minnich, Austin J. (2018) Dynamic optical control of near-field radiative transfer. Optics Express, 26 (18). A729-A736. ISSN 1094-4087. doi:10.1364/oe.26.00a729.

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Dynamic control of radiative heat transfer is of fundamental interest as well as for applications in thermal management and energy conversion. However, realizing high contrast control of heat flow without moving parts and with high temporal frequencies remains a challenge. Here, we propose a thermal modulation scheme based on optical pumping of semiconductors in near-field radiative contact. External photo-excitation of the semiconductor emitters leads to increases in the free carrier concentration that in turn alters the plasma frequency, resulting in modulation of near-field thermal radiation. The temporal frequency of the modulation can reach hundreds of kHz limited only by the recombination lifetime, greatly exceeding the bandwidth of methods based on temperature modulcation. Calculations based on fluctuational electrodynamics show that the heat transfer coefficient between two silicon films can be tuned from near zero to 600 Wm^(−2)K^(−1) with a gap distance of 100 nm at room temperature.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kou, Junlong0000-0002-0481-5149
Minnich, Austin J.0000-0002-9671-9540
Additional Information:© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 26 Mar 2018; revised 4 Jun 2018; accepted 5 Jun 2018; published 24 Jul 2018. Funding: US Department of Energy, Office of Science, Office of Basic Energy Sciences (DE-SC0001293).
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001293
Issue or Number:18
Classification Code:OCIS codes: (350.5610) Radiation; (120.6810) Thermal effects; (240.6680) Surface plasmons
Record Number:CaltechAUTHORS:20180912-135435405
Persistent URL:
Official Citation:Junlong Kou and Austin J. Minnich, "Dynamic optical control of near-field radiative transfer," Opt. Express 26, A729-A736 (2018)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89581
Deposited By: George Porter
Deposited On:12 Sep 2018 21:23
Last Modified:16 Nov 2021 00:36

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