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Related Experiment Video

Updated: May 12, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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Published on: April 16, 2017

Enhancing far-field thermal emission with thermal extraction.

Zongfu Yu¹, Nicholas P Sergeant, Torbjørn Skauli

¹Department of Electrical Engineering and Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.

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|April 18, 2013

Summary

Researchers demonstrate a novel thermal extraction scheme to significantly enhance thermal radiation. This method boosts thermal emission from blackbody emitters, crucial for energy conversion and radiative cooling applications.

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Area of Science:

Thermodynamics
Optics
Materials Science

Background:

Controlling thermal radiation is vital for energy conversion and radiative cooling.
Existing methods for thermal emission control have limitations.

Purpose of the Study:

To theoretically and experimentally investigate a thermal extraction scheme for enhancing thermal emission.
To demonstrate enhanced far-field thermal emission from a blackbody emitter.

Main Methods:

Theoretical modeling of a thermal extraction scheme involving an emitter and a transparent extraction device.
Experimental setup using a carbon-black emitter in optical contact with an extraction device.
Measurement of far-field thermal emission enhancement.

Main Results:

Theoretically, enhanced thermal emission is achievable when the emitter and extraction device have a higher internal density of states than vacuum.
The extraction device must be larger than the emitter and possess a geometry facilitating light extraction.
Experimentally observed a four-fold enhancement in far-field thermal emission from a carbon-black emitter (emissivity 0.85).

Conclusions:

The thermal extraction scheme effectively enhances thermal radiation.
This approach offers a promising pathway for improving energy conversion and radiative cooling technologies.
The findings highlight the importance of internal density of states and geometric factors in thermal emission control.