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Author(s): Fang, JM (Fang, Jimin); Zou, JQ (Zou, Jiaqi); Liu, TY (Liu, Tingyu); Wang, YT (Wang, Yating); Sun, XQ (Sun, Xiaoqiang); Wu, XH (Wu, Xiaohu); Wu, YD (Wu, Yuanda); Zhang, DM (Zhang, Daming)

Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER?Volume: 223??Article Number: 125229??DOI: 10.1016/j.ijheatmasstransfer.2024.125229??Early Access Date: JAN 2024???Published: MAY 15 2024?

Abstract: Nonreciprocal thermal radiation is valuable to the energy transmission and collection. Issues of single polarization in near-infrared band with large incident angle cast limitations on the development of nonreciprocal thermal radiation. A dual-polarization narrow-band nonreciprocal thermal radiator in near-infrared band with extremely small incident angle is proposed to address these issues. The radiator consists of periodic annular arrays, magneto-optical medium and metal reflective layer. The simulation results show that the nonreciprocity of two polarizations is greater than 85 % with ultra-high Q factor at the angle of 0.8. The finite element method and coupled mode theory that are adopted in the study offer high consistent results, which prove the accuracy of calculation results. The physical mechanism of near-infrared narrow-band nonreciprocal radiation is attributed to the excitation of cavity resonance and guided mode resonance. The proposed two-dimensional near-infrared nonreciprocal radiator that allows the dual-polarization operation at small incident angle offers it good potentials in thermal photovoltaic system and energy conversion.

Accession Number: WOS:001173553300001

ISSN: 0017-9310

eISSN: 1879-2189