Angular resolution limit of augmented reality waveguides from guided mode theory

arXiv:2610.09527v1 Announce Type: new Abstract: We derive the angular resolution limit of an augmented-reality (AR) waveguide combiner from guided mode theory. A slab of finite thickness supports only a discrete set of total-internal-reflection (TIR) angles, giving an angular resolution that worsens with thinner waveguides and smaller TIR angles. At 500 $\mu$m thickness the resolution is worse than the 1 arcmin (60 ppd) acuity target over most of the usable TIR range, and reaching 1 arcmin for TIR < 42$^\circ$ requires a substrate thicker than 1 mm. The limit is washed out by a source linewidth above $\sim$0.1 nm or a thickness variation above $\sim$100 nm across the pupil-replication period, but only partially by pupil truncation and not at all by out-coupling loss. LED- and micro-LED-based displays are therefore unaffected with their broad spectrum, whereas a narrow-linewidth laser-based display in a thin, uniform waveguide is subject to this limit.