We present a novel approach to resolving the vergence–accommodation conflict(VAC)in extended reality(XR)optics by introducing a quarter-waveplate(QWP)geometric phase lens(GPL)capable of triple wavefront modulation—f...We present a novel approach to resolving the vergence–accommodation conflict(VAC)in extended reality(XR)optics by introducing a quarter-waveplate(QWP)geometric phase lens(GPL)capable of triple wavefront modulation—focusing,defocusing,and non-modulating at infinity.This polarization-driven behavior is interpreted using contour trajectories on the Poincarésphere and compared against conventional half-waveplate(HWP)GPLs.Leveraging this property,we propose a bi-stacked QWP GPL module that enables nine distinct varifocal states through polarization-controlled input selection and output filtering.In contrast,HWP-based modules under equivalent stacking conditions are limited to four focal states.The QWP GPL module supports a compact varifocal system spanning a continuous depth range from 24.27 cm to infinity,with a 0.3-diopter interval aligned with the human visual comfort zone.Importantly,the number of representable focal depths scales as 3^(n)for n stacked layers,offering a(1.5)^(n)-fold improvement over the 2^(n)scaling of HWP systems.This enables finer depth transitions using fewer lens units while retaining both compactness and optical modularity,establishing a depth-switchable imaging platform that enhances visual comfort and depth fidelity in next-generation XR display systems.展开更多
基金supported by the National Research Foundation(NRF)funded by the Korean government(MSIT)(No.RS-2024-00416272).
文摘We present a novel approach to resolving the vergence–accommodation conflict(VAC)in extended reality(XR)optics by introducing a quarter-waveplate(QWP)geometric phase lens(GPL)capable of triple wavefront modulation—focusing,defocusing,and non-modulating at infinity.This polarization-driven behavior is interpreted using contour trajectories on the Poincarésphere and compared against conventional half-waveplate(HWP)GPLs.Leveraging this property,we propose a bi-stacked QWP GPL module that enables nine distinct varifocal states through polarization-controlled input selection and output filtering.In contrast,HWP-based modules under equivalent stacking conditions are limited to four focal states.The QWP GPL module supports a compact varifocal system spanning a continuous depth range from 24.27 cm to infinity,with a 0.3-diopter interval aligned with the human visual comfort zone.Importantly,the number of representable focal depths scales as 3^(n)for n stacked layers,offering a(1.5)^(n)-fold improvement over the 2^(n)scaling of HWP systems.This enables finer depth transitions using fewer lens units while retaining both compactness and optical modularity,establishing a depth-switchable imaging platform that enhances visual comfort and depth fidelity in next-generation XR display systems.
