Harnessing phonon polaritons for extreme and unidirectional thermal emission

Stavroula Foteinopoulou; Ganga Chinna Rao Devarapu

doi:10.1117/12.2567793

22 August 2020 Harnessing phonon polaritons for extreme and unidirectional thermal emission

Stavroula Foteinopoulou, Ganga Chinna Rao Devarapu

Proceedings Volume 11496, New Concepts in Solar and Thermal Radiation Conversion III; 1149607 (2020) https://doi.org/10.1117/12.2567793
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Strong coupling between light and ionic vibrations in matter (phonons) gives rise to composite light-matter waves referred to as phonon polaritons (PhPs). Such strong coupling is common in polar semiconductors within a spectral band in the infrared (IR) known as the reststrahlen band. While bulk materials are essentially near-perfect reflectors in the reststrahlen band, structured materials have vast capabilities in their photonic responses. We leverage here the permittivity responses induced by phonon polaritons to design structures behaving as near-perfect absorbers/thermal emitters. We discuss a lithography-free design route to near-perfect absorption within a material layer as thin as one thousandth the free space wavelength. Furthermore, we present a paradigm inspired by moth eyes exhibiting all-angle near-unidirectional absorption and thermal emission. Our findings are relevant to the development of selective thermal emitters and passive radiative cooling devices.

Conference Presentation

Citation Download Citation

Stavroula Foteinopoulou and Ganga Chinna Rao Devarapu "Harnessing phonon polaritons for extreme and unidirectional thermal emission", Proc. SPIE 11496, New Concepts in Solar and Thermal Radiation Conversion III, 1149607 (22 August 2020); https://doi.org/10.1117/12.2567793

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