Selective broadband absorption by mode splitting for radiative cooling

Titelangaben

Matsumori, Kishin ; Fujimura, Ryushi ; Retsch, Markus:
Selective broadband absorption by mode splitting for radiative cooling.
In: Optics Express. Bd. 30 (2022) Heft 9 . - S. 14258-14273.
ISSN 1094-4087
DOI: https://doi.org/10.1364/OE.452912

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Abstract

A plasmonic-photonic structure based on colloidal lithography was designed for a scalable radiative cooling system and its absorption properties were theoretically investigated. The structure comprises a SiO2 core, which is on top of an Au reflector and partially covered by an indium tin oxide (ITO) shell. This simple and scalable structure possesses a strong selective absorption in the primary atmospheric transparency window (8–13 µm). The strong selective absorption is attributed to a mode splitting of the localized surface plasmon (LSP) of the ITO shell. To understand the mechanisms of the mode splitting, a quantitative analysis was conducted using a coupled-oscillator model and a coupled-dipole method. The analysis revealed that the mode splitting is induced by a strong coupling between the LSP of the ITO shell and a magnetic dipole Mie resonance of the SiO2 core.