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Title: Dynamic optical control of near-field radiative transfer

Abstract

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. Furthermore 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 -2K -1 with a gap distance of 100 nm at room temperature.

Authors:
ORCiD logo;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1461583
Alternate Identifier(s):
OSTI ID: 1503306
Grant/Contract Number:  
SC0001293
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 26 Journal Issue: 18; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Radiation; Thermal effects; Surface plasmon

Citation Formats

Kou, Junlong, and Minnich, Austin J. Dynamic optical control of near-field radiative transfer. United States: N. p., 2018. Web. doi:10.1364/OE.26.00A729.
Kou, Junlong, & Minnich, Austin J. Dynamic optical control of near-field radiative transfer. United States. doi:10.1364/OE.26.00A729.
Kou, Junlong, and Minnich, Austin J. Tue . "Dynamic optical control of near-field radiative transfer". United States. doi:10.1364/OE.26.00A729.
@article{osti_1461583,
title = {Dynamic optical control of near-field radiative transfer},
author = {Kou, Junlong and Minnich, Austin J.},
abstractNote = {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. Furthermore 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-2K-1 with a gap distance of 100 nm at room temperature.},
doi = {10.1364/OE.26.00A729},
journal = {Optics Express},
number = 18,
volume = 26,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.26.00A729

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Cited by: 3 works
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