High-efficiency large-angle Pancharatnam phase deflector based on dual-twist design

Abstract

We have previously shown through simulation that an optical beam deflector based on the Pancharatnam (geometric) phase can provide high efficiency with up to 80° deflection using a dual-twist structure for polarization-state control [Appl. Opt.54, 10035 (2015)]. In this report, we demonstrate that its optical performance is as predicted and far beyond what could be expected for a conventional diffractive optical device. We provide details about construction and characterization of a ± 40° beam-steering device with 90% diffraction efficiency based on our dual-twist design at a 633nm wavelength.

Recent progress in Pancharatnam–Berry phase optical elements and the applications for virtual/augmented realities

“…At a de ection angle of 45°, the e ciency for RCP drops to zero, and therefore a RCP input will pass through the PBOE without de ection or change of polarization state. Along this route, Gao et al [34] demonstrated a high-e ciency 40°de ector with dual-twist structure, and therefore the result resembles that of the non-twist PBD, i.e., same high e ciency de ection in opposite direction for RCP and LCP. Though PBDs with proper twisting angle allow good in-and out-coupling for waveguidebased AR device, as a phase-based grating, it also a ects the real-world light on the waveguide output side, since the modulation is phase-based.…”

Compact see‐through near‐eye display with depth adaption

“…Following by the exposure process, the sample was spin‐coated with a reactive mesogen such as RM257 to induce phase retardation and then UV‐cured to solidify the coated reactive mesogen. Multiple coatings might be necessary to ensure high diffractive efficiency …”

“…Multiple coatings might be necessary to ensure high diffractive efficiency. 6,7 3 Device structure and simulation results Based on the PBL and PBD described previously, we propose an optical design shown in Fig. 4.…”

“…The objective of this paper is to develop a compact and lightweight optical system for augmented reality displays 1,2 with depth information using Pancharatnam-Berry optical elements as a deflector (PBD) or as a lens (PBL). [3][4][5][6][7][8] Our approach promises a more compact design and better functionality for the near-eye displays.…”

59‐4: Fast‐response polarization volume gratings for AR/VR displays

“…PVG exhibits not only strong polarization selectivity, high diffraction efficiency but also large deflection angle. Bragg grating can be used as beam steering for eye tracking in virtual reality displays and waveguide for augmented reality displays [5][6][7].…”