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Broadband Spin-Selective Wavefront Manipulations Based on Pancharatnam-Berry Coding Metasurfaces
Yue Gou1, Hui Feng Ma1, Liang Wei Wu1
1State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
ACS Omega
|November 15, 2021
Summary
This study introduces a novel Pancharatnam-Berry (PB) coding metasurface for broadband spin-selective reflection. The device efficiently reflects designated circularly polarized (CP) waves while suppressing others across a wide frequency range.
Area of Science:
- Metamaterials and Metasurfaces
- Electromagnetics
- Wave Optics
Background:
- Chiral metamirrors enable spin-selective reflection of circularly polarized (CP) waves.
- Existing chiral metamirrors often suffer from narrow bandwidth limitations, hindering practical applications.
Purpose of the Study:
- To propose and demonstrate a Pancharatnam-Berry (PB) coding metasurface for broadband spin-selective reflection.
- To achieve arbitrary wavefront manipulation alongside spin-selective reflection using spin-decoupled elements.
Main Methods:
- Design of a Pancharatnam-Berry (PB) coding metasurface utilizing spin-decoupled meta-elements.
- Experimental and simulation validation of the metasurface's spin-selective anomalous reflection capabilities.
- Characterization of performance across a broad frequency band (16-24 GHz).
Main Results:
- Efficient reflection of a designated CP wave without spin reversal.
- Suppression of orthogonally polarized waves through random diffusion.
- Demonstration of broadband operation from 16 to 24 GHz.
- Observation of chiral-like characteristics despite using nonchiral meta-elements.
Conclusions:
- The proposed PB coding metasurface offers broadband spin-selective reflection with wavefront control.
- The metasurface effectively separates and manipulates different spin states of CP waves.
- This technology provides a promising platform for advanced electromagnetic applications requiring spin-based functionalities.
