Optimization of highly circularly polarized thermal radiation in $\alpha$-MoO$_3$/$\beta$-Ga$_2$O$_3$ twisted layers
| Autor: | Centini, Marco, Yang, Chiyu, Larciprete, Maria Cristina, Antezza, Mauro, Zhang, Zhuomin M. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | J. Quant. Spectrosc. Radiat. Transf. 323, 109051 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.jqsrt.2024.109051 |
| Popis: | We investigate a bi-layer scheme for circularly polarized infrared thermal radiation. Our approach takes advantage of the strong anisotropy of low-symmetry materials such as $\beta$-Ga$_2$O$_3$ and $\alpha$-MoO$_3$. We numerically report narrow-band, high degree of circular polarization (over 0.85), thermal radiation at two typical emission frequencies related to the excitation of $\beta$-Ga$_2$O$_3$ optical phonons. Optimization of the degree of circular polarization is achieved by a proper relative tilt of the crystal axes between the two layers. Our simple but effective scheme could set the basis for a new class of lithography-free thermal sources for IR bio-sensing. Comment: 11 pages, 6 figures |
| Databáze: | arXiv |
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