Optimization of highly circularly polarized thermal radiation in $α$-MoO$_3$/$β$-Ga$_2$O$_3$ twisted layers
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909209606488064 |
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| author | Centini, Marco Yang, Chiyu Larciprete, Maria Cristina Antezza, Mauro Zhang, Zhuomin M. |
| author_facet | Centini, Marco Yang, Chiyu Larciprete, Maria Cristina Antezza, Mauro Zhang, Zhuomin M. |
| contents | 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 $β$-Ga$_2$O$_3$ and $α$-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 $β$-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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_13801 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Optimization of highly circularly polarized thermal radiation in $α$-MoO$_3$/$β$-Ga$_2$O$_3$ twisted layers Centini, Marco Yang, Chiyu Larciprete, Maria Cristina Antezza, Mauro Zhang, Zhuomin M. Optics 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 $β$-Ga$_2$O$_3$ and $α$-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 $β$-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. |
| title | Optimization of highly circularly polarized thermal radiation in $α$-MoO$_3$/$β$-Ga$_2$O$_3$ twisted layers |
| topic | Optics |
| url | https://arxiv.org/abs/2310.13801 |