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Title: Spectral near-field thermal emission extraction by optical waveguides

Abstract

As far-field thermal emission is limited by blackbody radiation, the significant enhancement of thermal radiation in the near-field plays a vital role in a variety of applications such as infrared sensing, radiation cooling, and thermophotovoltaics. Yet the techniques of exporting the near-field signal to the far field are still not mature, typically relying on complex instrumentation capable of being applied only to the surfaces of model systems and structures. Here we develop an efficient method of extracting near-field thermal radiation to the far field by integrating a nanoscale thermal emitter with a high-index optical waveguide. By directly depositing the emitter onto the optical waveguide, it requires no vacuum gap and enables efficient coupling of near-field thermal radiation into propagating wave-guided modes. A single-mode planar waveguide incorporated with an indium-tin oxide (ITO) film as a thermal emitter is theoretically investigated to prove the feasibility of thermal extraction. The Wiener-chaos expansion method is applied to directly calculate the thermal radiation from the emitter-waveguide system. We experimentally demonstrate the fidelity of the optical-waveguide-assisted near-field thermal extraction by measuring the emission spectrum of an ITO-coated optical fiber and comparing with theoretical predictions. Our experimental demonstration in conjunction with the direct simulation paves the waymore » for effectively extracting near-field thermal radiation with applications in chemical sensing, infrared imaging, and near-field thermal energy management.« less

Authors:
 [1];  [2];  [2];  [2];  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Mechanical Engineering
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1569830
Alternate Identifier(s):
OSTI ID: 1546237
Grant/Contract Number:  
89243318CFE000003
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Li, Jiayu, Wuenschell, Jeffrey, Jee, Youngseok, Ohodnicki, Paul R., and Shen, Sheng. Spectral near-field thermal emission extraction by optical waveguides. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.235414.
Li, Jiayu, Wuenschell, Jeffrey, Jee, Youngseok, Ohodnicki, Paul R., & Shen, Sheng. Spectral near-field thermal emission extraction by optical waveguides. United States. doi:10.1103/PhysRevB.99.235414.
Li, Jiayu, Wuenschell, Jeffrey, Jee, Youngseok, Ohodnicki, Paul R., and Shen, Sheng. Wed . "Spectral near-field thermal emission extraction by optical waveguides". United States. doi:10.1103/PhysRevB.99.235414.
@article{osti_1569830,
title = {Spectral near-field thermal emission extraction by optical waveguides},
author = {Li, Jiayu and Wuenschell, Jeffrey and Jee, Youngseok and Ohodnicki, Paul R. and Shen, Sheng},
abstractNote = {As far-field thermal emission is limited by blackbody radiation, the significant enhancement of thermal radiation in the near-field plays a vital role in a variety of applications such as infrared sensing, radiation cooling, and thermophotovoltaics. Yet the techniques of exporting the near-field signal to the far field are still not mature, typically relying on complex instrumentation capable of being applied only to the surfaces of model systems and structures. Here we develop an efficient method of extracting near-field thermal radiation to the far field by integrating a nanoscale thermal emitter with a high-index optical waveguide. By directly depositing the emitter onto the optical waveguide, it requires no vacuum gap and enables efficient coupling of near-field thermal radiation into propagating wave-guided modes. A single-mode planar waveguide incorporated with an indium-tin oxide (ITO) film as a thermal emitter is theoretically investigated to prove the feasibility of thermal extraction. The Wiener-chaos expansion method is applied to directly calculate the thermal radiation from the emitter-waveguide system. We experimentally demonstrate the fidelity of the optical-waveguide-assisted near-field thermal extraction by measuring the emission spectrum of an ITO-coated optical fiber and comparing with theoretical predictions. Our experimental demonstration in conjunction with the direct simulation paves the way for effectively extracting near-field thermal radiation with applications in chemical sensing, infrared imaging, and near-field thermal energy management.},
doi = {10.1103/PhysRevB.99.235414},
journal = {Physical Review B},
number = 23,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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Works referenced in this record:

Plasmonic transparent conducting metal oxide nanoparticles and nanoparticle films for optical sensing applications
journal, July 2013


Taming the Blackbody with Infrared Metamaterials as Selective Thermal Emitters
journal, July 2011


Passive radiative cooling below ambient air temperature under direct sunlight
journal, November 2014

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