Optical Degenerate Points Regulation in One‑Dimensional Quaternary Periodic PT Symmetric Structure

Yifei Song; Yetao Shu; peng Tang; ting Wan; Zhaoming Luo

doi:10.3788/CJL221327

Chinese Journal of Lasers, Volume. 50, Issue 22, 2213001(2023)

Optical Degenerate Points Regulation in One‑Dimensional Quaternary Periodic PT Symmetric Structure

Yifei Song¹, Yetao Shu¹, peng Tang¹, ting Wan¹, and Zhaoming Luo^1,2、*

¹Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communications, School of Information Science and Engineering, Hunan Institute of Science and Technology, Yueyang 414006, Hunan, China

²School of Physics and Chemistry, Hunan First Normal University, Changsha 410205, Hunan, China

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Figures & Tables(7)

Fig. 1. Schematic of one-dimensional quaternary periodic PT symmetric structure ${(A B C D)}^{N}$

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Fig. 2. Transmission spectra of one-dimensional quaternary periodic PT symmetric structure (ABCD)³. (a) Transmission spectra of one-dimensional quaternary periodic PT symmetric structure (ABCD)³ for normal incidence; (b)(c) transmission spectra of one-dimensional quaternary periodic PT symmetric structure (ABCD)³ when p-polarized and s-polarized light incident at different incident angles $θ_{i}$

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Fig. 3. Pseudo-color images of transmission and reflectance of one-dimensional quaternary periodic PT symmetric structure (ABCD)³ as functions of gain-loss coefficient and incident angle. (a)‒(c) Transmission ( $T^{p}$ ) and reflectance ( $R_{+ z}^{p}$ and $R_{- z}^{p}$ ) as functions of gain-loss coefficient $q$ and incident angle $θ_{i}$ for p-polarized light incidence, respectively; (d)‒(f) transmission ( $T^{s}$ ), reflectance ( $R_{+ z}^{s}$ and $R_{- z}^{s}$ ) as functions of gain-loss coefficient $q$ and incident angle $θ_{i}$ for s-polarized light incidence, respectively

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Fig. 4. Reflectance, transmittance and the eigenvalues of scattering matrix of one-dimensional quaternary periodic PT symmetric structure ${(A B C D)}^{3}$ as functions of the incident angle. (a)(b) Variations of reflectance/transmittance ( $R$ , $T$ ) and the eigenvalues of scattering matrix $Ψ_{\pm}$ with incident angle $θ_{i}$ , respectively, when p-polarized light is incident on the structure ${(A B C D)}^{3}$ with gain-loss coefficient q=0.64; (c) (d) variation of reflectance/transmittance ( $R$ , $T$ ) and the eigenvalues of scattering matrix $Ψ_{\pm}$ with incident angle $θ_{i}$ , respectively, when s-polarized light is incident on the structure ${(A B C D)}^{3}$ with gain-loss coefficient q=0.43; (e)(f) variation of reflectance/transmittance ( $R$ , $T$ ) and the eigenvalues of scattering matrix $Ψ_{\pm}$ with incident angle $θ_{i}$ , respectively, when p-polarized light is incident on the structure ${(A B C D)}^{3}$ with the gain-loss coefficient q=0.1

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Fig. 5. Pseudo-color images of transmission and reflectance of one-dimensional quaternary periodic PT symmetric structure $A B C D$ as functions of gain-loss coefficient and incident angle. (a)‒(c) Transmission (T^p) and reflectance ( $R_{+ z}^{p}$ and $R_{- z}^{p}$ ) as functions of gain-loss coefficient $q$ and incident angle $θ_{i}$ for p-polarized light incidence, respectively; (d)‒(f) transmission (T^s) and reflectance ( $R_{+ z}^{s}$ and $R_{- z}^{s}$ ) as functions of gain-loss coefficient $q$ and incident angle $θ_{i}$ for s-polarized light incidence, respectively

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Fig. 6. Pseudo-color images of transmission and reflectance of one-dimensional quaternary periodic PT symmetric structure ${(A B C D)}^{6}$ as functions of gain-loss coefficient and incident angle. (a)‒(c) Transmission (T^p) and reflectance ( $R_{+ z}^{p}$ and $R_{- z}^{p}$ ) as functions of gain-loss coefficient $q$ and incident angle $θ_{i}$ for p-polarized light incidence, respectively; (d)‒(f) transmission (T^s) and reflectance ( $R_{+ z}^{s}$ and $R_{- z}^{s}$ ) as functions of gain-loss coefficient $q$ and incident angle $θ_{i}$ for s-polarized light incidence, respectively

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Fig. 7. Variation of photonic spin Hall effect shifts of one-dimensional quaternary periodic PT symmetric structure ${(A B C D)}^{3}$ with gain-loss coefficient. (a) Variation of photonic spin Hall effect shifts of horizontal polarized reflected beam $δ_{r}^{H}$ with gain-loss coefficient $q$ ; (b) variation of photonic spin Hall effect shifts of vertical polarized transmitted beam $δ_{t}^{V}$ with gain-loss coefficient $q$

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Yifei Song, Yetao Shu, peng Tang, ting Wan, Zhaoming Luo. Optical Degenerate Points Regulation in One‑Dimensional Quaternary Periodic PT Symmetric Structure[J]. Chinese Journal of Lasers, 2023, 50(22): 2213001

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Paper Information

Category: micro and nano optics

Received: Oct. 17, 2022

Accepted: Jan. 6, 2023

Published Online: Nov. 7, 2023

The Author Email: Luo Zhaoming (zhaomingluo@hnu.edu.cn)

DOI:10.3788/CJL221327

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology