High-efficiency large-angle reflective composite polarization grating

ABSTRACT

We introduce and demonstrate a new structure of polarisation grating which can substantially enlarge the deflection angle. We derive the polarisation state of a beam passing through the reflective composite polarisation grating by Jones matrix and build a rigorous simulation about the deflection angle of reflective composite polarisation grating using finite-element analysis. The theoretical diffraction efficiency of the reflective composite polarisation grating can reach up to 90%. The experimental result of deflection angle of the reflective composite polarisation grating is consistent with that of simulation. The reflective composite polarisation grating could be expected to be applied in augment reality system, spectroscopy, optical telecommunications, non-mechanical beam steering and so on.

Graphical abstract

KEYWORDS:

• Liquid crystal
• polarisation grating
• reflective mode
• beam steering

Acknowledgments

The authors are indebted to Rolic Company for their kind support with the photo-alignment material.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the The National Science Foundation of China [11604327, 11704377 and 61475152].