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

Taylor, Sydney; Yang, Yue; Wang, Liping

doi:10.1016/j.jqsrt.2017.01.014

Cited by 142 publications

(69 citation statements)

References 56 publications

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“…By having a lossless dielectric spacer, the photonic bandgap can be regulated to perform wavelength-selective, temperature-modulated emission. The earliest research consisted of thermally switchable vanadium oxide (VO 2 ) and Al on either side of a dielectric spacer [37] ( Figure 2d). When the temperature of the VO 2 is below 67.85 • C, the structure is highly reflective, thereby minimizing solar absorption.…”

Section: Metamaterial-based Radiative Cooling Using a Film Structurementioning

confidence: 99%

“…In using polymers for radiative cooling, the polymer layer plays an important role in assisting the conventional reflection and emission layers. SiO2/TiO2 multi-layer on a metallic Al/Ag reflector [35], (d) VO2 with a dielectric spacer on Al [37], (e) PDMS/SiO2 on Ag [38], (f) PTFE/Ag on Si [39], and (g) SiO2/PMMA/SiO2 on Al [40] have been reported.…”

Section: Metamaterial-based Radiative Cooling Using a Film Structurementioning

confidence: 99%

“…The most recent research using antenna structures by Cho et al [30] demonstrated thermal radiation using different materials. Tungsten (W) thermal emitters have a high emissivity over a broad range of wavelengths [37], (e) PDMS/SiO 2 on Ag [38], (f) PTFE/Ag on Si [39], and (g) SiO 2 /PMMA/SiO 2 on Al [40] have been reported.…”

Section: Metamaterial-based Radiative Cooling Using Nanostructuresmentioning

confidence: 99%

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Metamaterial-Based Radiative Cooling: Towards Energy-Free All-Day Cooling

et al. 2018

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In the light of the ever increasing dangers of global warming, the efforts to reduce energy consumption by radiative cooling techniques have been designed, but are inefficient under strong sunlight during the daytime. With the advent of metamaterials and their selective control over optical properties, radiative cooling under direct sunlight is now possible. The key principles of metamaterial-based radiative cooling are: almost perfect reflection in the visible and near-infrared spectrum (0.3–3 µm) and high thermal emission in the infrared atmospheric window region (8–13 µm). Based on these two basic principles, studies have been conducted using various materials and structures to find the most efficient radiative cooling system. In this review, we analyze the materials and structures being used for radiative cooling, and suggest the future perspectives as a substitute in the current cooling industry.

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Section: Metamaterial-based Radiative Cooling Using a Film Structurementioning

confidence: 99%

Section: Metamaterial-based Radiative Cooling Using a Film Structurementioning

confidence: 99%

Section: Metamaterial-based Radiative Cooling Using Nanostructuresmentioning

confidence: 99%

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Metamaterial-Based Radiative Cooling: Towards Energy-Free All-Day Cooling

et al. 2018

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“…The inversion of the intrinsic thermal radiative contrast, which means that thermal transfer is enhanced in the metallic state compared to the insulating state, opens various possibilities in the design of the thermal radiative devices including dynamic radiative cooling 15 and thermal homeostasis 16 by promoting heat transfer at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Inverting the thermal radiative contrast of vanadium dioxide by metasurfaces based on localized gap-plasmons

et al. 2018

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Vanadium dioxide (VO2) is a promising phase-change material (PCM) in controlling radiative heat transfer because of the large permittivity contrast between the phases and the moderate metal-insulator transition temperature of 340 K. Widely adopted bare VO2 films on a dielectric substrate permit more radiative heat in the insulating state compared to that in the metallic state. In this paper, we present PCM-insulator-metal metasurfaces that invert the thermal radiative contrast, which means that the radiative heat flux is more promoted in the metallic state. The metasurfaces exhibit similar but broader resonance compared to conventional metal-insulator-metal metamaterials based on localized gap-plasmons when VO2 is in the metallic state. The broad resonance facilitates to maximize the radiative thermal exchange and is explained by the damping of the gap-plasmon mode dominated by the optical loss of VO2. The measured electromagnetic response of the fabricated metasurfaces agrees well with numerical simulations, and it also demonstrates that the resonant wavelength is tuned by the temperature. High emission or absorption contrast at a specific temperature is numerically obtained by geometrical optimization albeit lossy amorphous silicon or alumina is employed as the insulating layer to satisfy the fabrication requirement. We believe that the presented metasurface design contributes to intelligent thermal management systems with flexibility.

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“…[47] have theoretically and experimentally demonstrated that a thin-film of VO 2 on sapphire shows strong modulation of absorbance upon phase transition, particularly, at wavelength of 11.6 μm. Taylor et al [48] recently proposed an emitter consisting a dielectric spacer between VO 2 film and a reflecting substrate to achieve dynamic radiative cooling upon phase transition of VO 2 . Fabry-Perot resonance was achieved at 10 μm wavelength.…”

Section: Introductionmentioning

confidence: 99%

Photonic Metamaterials: Controlling Nanoscale Radiative Thermal Transport

Ghanekar¹,

Tian²,

Zheng³

2018

Heat Transfer - Models, Methods and Applications

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We discuss concepts of radiative thermal diodes demonstrating dynamic control and modulation of radiative heat transfer. These concepts are analogous to electronic diodes and display high degree of asymmetry in radiative heat transfer. Change in optical properties of vanadium dioxide VO 2 ðÞ upon phase transition are exploited to influence thermal radiation. The first concept is based on a simple multi-layer structure containing a layer of VO 2 to attain dynamic optical response in the far-field regime. The active terminal of the diode changes from highly reflecting to highly absorbing upon phase transition of VO 2. In the second concept, a near-field thermal diode is considered that utilizes period gratings of VO 2. Radiative heat transfer across the near-field gap is modulated by altering tunneling of surface waves when phase change in VO 2 occurs. For minimal temperature difference of 20 K, rectification ratios have been reported and they are maximum in existing literature for comparable operating temperatures and configurations.

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

Cited by 142 publications

References 56 publications

Metamaterial-Based Radiative Cooling: Towards Energy-Free All-Day Cooling

Metamaterial-Based Radiative Cooling: Towards Energy-Free All-Day Cooling

Inverting the thermal radiative contrast of vanadium dioxide by metasurfaces based on localized gap-plasmons

Photonic Metamaterials: Controlling Nanoscale Radiative Thermal Transport

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