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

Journals >Chinese Journal of Lasers >Volume 50 >Issue 22 >Page 2213001 > Article

Chinese Journal of Lasers
Vol. 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、*

Author Affiliations

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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DOI: 10.3788/CJL221327 Cite this Article Set citation alerts

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 Copy Citation Text

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Schematic of one-dimensional quaternary periodic PT symmetric structure (ABCD)N

Fig. 1. Schematic of one-dimensional quaternary periodic PT symmetric structure

{(A B C D)}^{N}

Download full size

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 θi

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

Download full size

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

Download full size

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

Download full size

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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