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

Abstract

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° 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.

All-dielectric metasurfaces for intensity-controllable beam splitting and polarization conversion

“…At present, some metasurfaces have been designed to simultaneously perform polarization conversion and multichannel beam splitting [17][18][19][20][21][22][23]. Nevertheless, these metasurfaces shown thus far have some limitations.…”

“…Nevertheless, these metasurfaces shown thus far have some limitations. Some reflective metasurfaces often reduce space utilization and work efficiency [17,18], while others can only convert linearly polarized (LP) light into LP light in dual channels [19,20]. The spatial multiplexing method can increase the number of functional channels, but the efficiency of each function will decrease [21,22].…”