Vanadium dioxide based Fabry-Perot emitter for dynamic radiative cooling applications

Sydney Taylor, Yue Yang, Liping Wang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

An asymmetric Fabry-Perot emitter is proposed with a lossless dielectric spacer inserted between a vanadium dioxide (VO2) thin film and an opaque aluminum substrate. Switchable mid-infrared emittance has been achieved due to the insulator-to-metal transition of VO2. When VO2 is dielectric below 341K, the structure is highly reflective, thereby minimizing thermal radiation loss. Above 345K, the VO2 becomes metallic and forms a Fabry-Perot resonance cavity with high broadband emissivity around 10μm wavelength, providing a radiative cooling effect due to enhanced thermal emission. The radiative properties are calculated via a uniaxial transfer matrix method and Bruggeman effective medium theory. The physical mechanisms that provide the observed absorption enhancements are elucidated by examining the total phase shift in the multilayer structure and the phonon modes of VO2. When experiencing the VO2 phase transition, the radiative power of the proposed coating achieves a 6.5 fold enhancement for extraterrestrial spacecraft systems, and 7.3 fold enhancement for terrestrial systems such as buildings, making it a promising choice for dynamic radiative cooling applications in a variable environment. The findings here will facilitate research and development of novel coating materials for radiative cooling applications.

Original languageEnglish (US)
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
DOIs
StateAccepted/In press - Sep 14 2016

Fingerprint

dioxides
vanadium
emitters
Cooling
cooling
augmentation
coatings
Coatings
Transfer matrix method
Heat radiation
thermal radiation
thermal emission
research and development
emittance
Aluminum
emissivity
Phase shift
matrix methods
spacers
laminates

Keywords

  • Fabry-Perot resonance
  • Radiative cooling
  • Selective emittance
  • Vanadium dioxide

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

Cite this

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title = "Vanadium dioxide based Fabry-Perot emitter for dynamic radiative cooling applications",
abstract = "An asymmetric Fabry-Perot emitter is proposed with a lossless dielectric spacer inserted between a vanadium dioxide (VO2) thin film and an opaque aluminum substrate. Switchable mid-infrared emittance has been achieved due to the insulator-to-metal transition of VO2. When VO2 is dielectric below 341K, the structure is highly reflective, thereby minimizing thermal radiation loss. Above 345K, the VO2 becomes metallic and forms a Fabry-Perot resonance cavity with high broadband emissivity around 10μm wavelength, providing a radiative cooling effect due to enhanced thermal emission. The radiative properties are calculated via a uniaxial transfer matrix method and Bruggeman effective medium theory. The physical mechanisms that provide the observed absorption enhancements are elucidated by examining the total phase shift in the multilayer structure and the phonon modes of VO2. When experiencing the VO2 phase transition, the radiative power of the proposed coating achieves a 6.5 fold enhancement for extraterrestrial spacecraft systems, and 7.3 fold enhancement for terrestrial systems such as buildings, making it a promising choice for dynamic radiative cooling applications in a variable environment. The findings here will facilitate research and development of novel coating materials for radiative cooling applications.",
keywords = "Fabry-Perot resonance, Radiative cooling, Selective emittance, Vanadium dioxide",
author = "Sydney Taylor and Yue Yang and Liping Wang",
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AU - Taylor, Sydney

AU - Yang, Yue

AU - Wang, Liping

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N2 - An asymmetric Fabry-Perot emitter is proposed with a lossless dielectric spacer inserted between a vanadium dioxide (VO2) thin film and an opaque aluminum substrate. Switchable mid-infrared emittance has been achieved due to the insulator-to-metal transition of VO2. When VO2 is dielectric below 341K, the structure is highly reflective, thereby minimizing thermal radiation loss. Above 345K, the VO2 becomes metallic and forms a Fabry-Perot resonance cavity with high broadband emissivity around 10μm wavelength, providing a radiative cooling effect due to enhanced thermal emission. The radiative properties are calculated via a uniaxial transfer matrix method and Bruggeman effective medium theory. The physical mechanisms that provide the observed absorption enhancements are elucidated by examining the total phase shift in the multilayer structure and the phonon modes of VO2. When experiencing the VO2 phase transition, the radiative power of the proposed coating achieves a 6.5 fold enhancement for extraterrestrial spacecraft systems, and 7.3 fold enhancement for terrestrial systems such as buildings, making it a promising choice for dynamic radiative cooling applications in a variable environment. The findings here will facilitate research and development of novel coating materials for radiative cooling applications.

AB - An asymmetric Fabry-Perot emitter is proposed with a lossless dielectric spacer inserted between a vanadium dioxide (VO2) thin film and an opaque aluminum substrate. Switchable mid-infrared emittance has been achieved due to the insulator-to-metal transition of VO2. When VO2 is dielectric below 341K, the structure is highly reflective, thereby minimizing thermal radiation loss. Above 345K, the VO2 becomes metallic and forms a Fabry-Perot resonance cavity with high broadband emissivity around 10μm wavelength, providing a radiative cooling effect due to enhanced thermal emission. The radiative properties are calculated via a uniaxial transfer matrix method and Bruggeman effective medium theory. The physical mechanisms that provide the observed absorption enhancements are elucidated by examining the total phase shift in the multilayer structure and the phonon modes of VO2. When experiencing the VO2 phase transition, the radiative power of the proposed coating achieves a 6.5 fold enhancement for extraterrestrial spacecraft systems, and 7.3 fold enhancement for terrestrial systems such as buildings, making it a promising choice for dynamic radiative cooling applications in a variable environment. The findings here will facilitate research and development of novel coating materials for radiative cooling applications.

KW - Fabry-Perot resonance

KW - Radiative cooling

KW - Selective emittance

KW - Vanadium dioxide

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