Photonic spin Hall effect (PSHE) can be achieved by using the patterned structures or metal/dielectric multilayers in the nanophotonic systems; however, the complicated structures of these devices hinder their further applications. Herein, we demonstrate that highly directional PSHE can be realized through the excitation of hyperbolic phonon polaritons (HPPs) in a comparably simple architecture based on an anisotropic α-MoO3 thin film. It is shown that the propagation of the HPP modes of α-MoO3 in the reststrahlen (RS) bands exhibits topological transitions between open hyperbola and closed ellipse in both real space and momentum space (k-space) due to the extreme in-plane anisotropy. Specifically, larger dispersion angle possesses larger figure of merit (FoM), and high k mode of HPPs exhibits robust propagation properties at the maximum dispersion angle. Spin-selected propagation with asymmetric ratio of intensity equal to ±0.94 can be realized by changing the handedness of the dipole emitters. By changing the incident wavelengths of the RS bands, the propagation angle of the HPP modes can be dynamically tuned in wide angular and wavelength ranges.
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18 March 2024
Research Article|
March 22 2024
Hyperbolic phonon polaritons-induced photonic spin Hall effect in an α-MoO3 thin film
Special Collection:
Topological and Chiral Matter – Physics and Applications
Chui Pian
;
Chui Pian
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University
, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
, Wuxi 214122, China
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Tian Sang
;
Tian Sang
a)
(Conceptualization, Funding acquisition, Investigation, Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University
, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
, Wuxi 214122, China
a)Author to whom correspondence should be addressed: [email protected]
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Xianghu Zhang
;
Xianghu Zhang
(Formal analysis, Software, Visualization)
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University
, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
, Wuxi 214122, China
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Chen Luo
;
Chen Luo
(Software, Validation)
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University
, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
, Wuxi 214122, China
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Zekun Ge
;
Zekun Ge
(Formal analysis, Software)
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University
, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
, Wuxi 214122, China
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Yueke Wang
Yueke Wang
(Methodology, Resources)
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University
, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
, Wuxi 214122, China
Search for other works by this author on:
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 124, 121602 (2024)
Article history
Received:
January 24 2024
Accepted:
March 14 2024
Citation
Chui Pian, Tian Sang, Xianghu Zhang, Chen Luo, Zekun Ge, Yueke Wang; Hyperbolic phonon polaritons-induced photonic spin Hall effect in an α-MoO3 thin film. Appl. Phys. Lett. 18 March 2024; 124 (12): 121602. https://doi.org/10.1063/5.0199944
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