Reconfigurable holographic polymer dispersed liquid crystal grating template for waveguide display.

In this Letter, a reconfigurable holographic polymer dispersed liquid crystal (HPDLC) grating template is presented that is obtained by removing the liquid crystal from a formed HPDLC grating. The diffraction characteristics of the HPDLC grating template are studied theoretically and experimentally. Compared to the typical HPDLC grating, the HPDLC grating template possesses higher diffraction efficiency with lower polarization dependency. The diffraction efficiency of the HPDLC grating template can be dynamically reconfigured by refilling organic solution with a different refractive index. Moreover, a waveguide display system based on the HPDLC grating template is constructed. The merits of the ease of fabrication, high diffraction efficiency, low polarization dependency, and reconfigurable characteristics shown by the HPDLC grating template will benefit the waveguide display to obtain higher light efficiency and better exit pupil expansion.