Dynamic polarization rotation and vector field steering based on phase change metasurface

doi:10.1007/s11467-022-1214-x

Front. Phys.

2023, Vol. 18

Issue (1) : 12303 https://doi.org/10.1007/s11467-022-1214-x

RESEARCH ARTICLE

Dynamic polarization rotation and vector field steering based on phase change metasurface

Hairong He, Hui Yang, Zhenwei Xie(

), Xiaocong Yuan

Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China

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Abstract

Polarization rotation and vector field steering of electromagnetic wave are of great significance in modern optical applications. However, conventional polarization devices are bulky, monofunctional and lack of tunability, which pose great challenges to the miniaturized and multifunctional applications. Herein, we propose a meta-device that is capable of multi-state polarization rotation and vector field steering based on phase change metasurface. The supercell of the meta-device consists of four Ge₂Sb₂Te₅ (GST) elliptic cylinders located on a SiO₂ substrate. By independently controlling the phase state (amorphous or crystalline) of each GST elliptic cylinder, the meta-device can rotate the polarization plane of the linearly polarized incident light to different angles that cover from 19.8° to 154.9° at a wavelength of 1550 nm. Furthermore, by merely altering the phase transition state of GST elliptic cylinders, we successfully demonstrated a vector field steering by generating optical vortices carrying orbital angular momentums (OAMs) with topological charges of 0, 1 and −1, respectively. The proposed method provides a new platform for investigating dynamically tunable optical devices and has potential applications in many fields such as optical communications and information processing.

Keywords polarization rotation vector field steering phase change metasurface

Corresponding Author(s): Zhenwei Xie

Issue Date: 30 November 2022

Cite this article:

Hairong He,Hui Yang,Zhenwei Xie, et al. Dynamic polarization rotation and vector field steering based on phase change metasurface[J]. Front. Phys. , 2023, 18(1): 12303.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-022-1214-x
https://academic.hep.com.cn/fop/EN/Y2023/V18/I1/12303

Fig.1 Schematics of (a) the designed metasurface for polarization rotation and vector field steering, (b) the configuration of the supercell, and (c) top view of a unit cell.

Fig.2 Calculated phase of the coefficient of transmission t_xx in the A-state (a) and C-state (b), and of t_yx in the A-state (c) and C-state (d) for a periodic unit-cell array at wavelength 1550 nm.

Fig.3 Calculated PCR in (a) the A-state and (b) C-state, and transmittance in (c) the A-state and (d) C-state for a periodic unit cell array at wavelength 1550 nm.

Parameters	Values

[a ,b] (nm)	[70 , 200]	[70, 205]	[65, 220]	[65, 225]
PCR_{_A}	90.06%	93.81%	96.59%	97.57%
PCR_{_C}	2.3%	2.48%	0.40%	0.69%
$φ$ _{yx_A} − $φ$ _{xx_C} (rad)	−0.057	0.026	−0.05	0.006
T_{_A}	74.05%	73.28%	73.52%	73.21%
T_{_C}	22.34%	20.57%	18.26%	17.17%

Tab.1 Selected settings of the structural and optical-response parameters.

Fig.4 (a) Configuration of GST states, (b) the polarization angle, (c) DoLP, (d) ellipticity angle and (e) transmittance of the transmitted light of the metasurface for each of the eight combination of unit cell from four elliptic cylinders (wavelength: 1550 nm).

Fig.5 (a) Procedure to obtain the required phase arrangement to generate optical vortex beam. (b) Schematic diagram for obtaining optical vortex beam with OAMs using GST metasurface. The calculated distributions of (c) intensity and (d) phase of the diffraction beam at a transverse plane of z = 400 mm (wavelength: 1550 nm).

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