Ultra-broadband Pancharatnam-Berry phase metasurface for arbitrary rotation of linear polarization and beam splitter

A systematic study of a robust angular tolerance ultra-broadband metasurface for arbitrary rotation of linear polarization is demonstrated. The proposed method combines the spin-dependent Pancharatnam-Berry phase and the generalized Snell's law to achieve an arbitrary angle linear polarization rotator and beam splitter. Numerical results of one terahertz example show that a 90 degrees polarization rotator has a polarization conversion ratio of more than 90% from 1.3 to 2.3 THz in the ultra-broadband range. This method represents a significant advance in versatile, flexible design and performance compared to previously reported birefringent material wave plates, grating structures, and multi-resonance-based polarization rotators. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This study presents a systematic investigation on a robust angular tolerance ultra-broadband metasurface for arbitrary rotation of linear polarization. By combining the spin-dependent Pancharatnam-Berry phase and the generalized Snell's law, the proposed method achieves arbitrary angle linear polarization rotation and beam splitting. Numerical results demonstrate that a 90 degrees polarization rotator exhibits a polarization conversion ratio of over 90% from 1.3 to 2.3 THz in the ultra-broadband range. This method represents a significant advancement in versatile, flexible design and performance compared to previously reported techniques.