A Triple-Mode Midinfrared Modulator for Radiative Heat Management of Objects with Various Emissivity.

TitleA Triple-Mode Midinfrared Modulator for Radiative Heat Management of Objects with Various Emissivity.
Publication TypeJournal Article
Year of Publication2021
AuthorsH Fang, W Xie, X Li, K Fan, Y-T Lai, B Sun, S Bai, WJ Padilla, and P-C Hsu
JournalNano Letters
Volume21
Start Page4106
Issue9
Pagination4106 - 4114
Date Published05/2021
Abstract

Thermal management is ubiquitous in the modern world and indispensable for a sustainable future. Radiative heat management provides unique advantages because the heat transfer can be controlled by the surface. However, different object emissivities require different tuning strategies, which poses challenges to develop dynamic and universal radiative heat management devices. Here, we demonstrate a triple-mode midinfrared modulator that can switch between passive heating and cooling suitable for all types of object surface emissivities. The device comprises a surface-textured infrared-semiabsorbing elastomer coated with a metallic back reflector, which is biaxially strained to sequentially achieve three fundamental modes: emission, reflection, and transmission. By analyzing and optimizing the coupling between optical and mechanical properties, we achieve a performance as follows: emittance contrast Δε = 0.58, transmittance contrast Δτ = 0.49, and reflectance contrast Δρ = 0.39. The device can provide a new design paradigm of radiation heat regulation for wearable, robotics, and camouflage technologies.

DOI10.1021/acs.nanolett.1c01147
Short TitleNano Letters