Spectrally-selective nanostructures for solar-energy harvesting and thermal management (Conference Presentation)

Sunmi Shin

doi:10.1117/12.2557749

27 April 2020 Spectrally-selective nanostructures for solar-energy harvesting and thermal management (Conference Presentation)

Sunmi Shin

Author Affiliations +

Proceedings Volume 11387, Energy Harvesting and Storage: Materials, Devices, and Applications X; 113870I (2020) https://doi.org/10.1117/12.2557749
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

Controlling thermal emission in the mid-infrared range is of great interests for thermal engineering with broad applications ranging from the solar-thermal absorber to thermal camouflage, from radiative cooling of spacecrafts and terrestrial objects to building envelopes, and heat shielding. In many these applications, it is often desirable to have selective absorptance in different parts of the spectrum. For example, for many solar utilization devices (such as solar-thermal, thermoelectric, and photovoltaics), absorption in the solar spectrum is desirable for harvesting solar energy to heat or directly into electricity. On the other hand, for cooling applications, it is preferred to have low solar absorption and high infrared emission. Achieving high spectral selectivity is a key strategy to enhance the figure of merit of the thermal absorbers or emitters. I will present my work aiming to achieve the spectral selective feature using nanostructures for these two opposite applications. Furthermore, I will introduce a novel approach to adopt nanostructures to manipulate thermal radiation. I could achieve a near-monochromatic far-field thermal emission, which is a big departure from the incandescent behavior as described by the Planck’s law. The key feature of the design is to utilize nanoscale emitters whose dimension is comparable to or smaller than the thermal wavelength, a regime when the Planckian energy distribution no longer holds. I will show my experimental and theoretical work to quantify the far-field thermal radiation from these rationally-designed nano-emitters. The result provides new insight into the realization of spatial and spectral distribution control for far-field thermal emission.

Conference Presentation

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Sunmi Shin "Spectrally-selective nanostructures for solar-energy harvesting and thermal management (Conference Presentation)", Proc. SPIE 11387, Energy Harvesting and Storage: Materials, Devices, and Applications X, 113870I (27 April 2020); https://doi.org/10.1117/12.2557749

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KEYWORDS

Nanostructures

Solar energy

Absorption

Camouflage

Infrared radiation

Mid-IR

Photovoltaics

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