Phys.org  August 4, 2022 A conventional optical phased arrays (OPA) based on a waveguide grating array suffers from strong cross talk between adjacent waveguides when the pitch is a half-wavelength or less. Researchers in Denmark theoretically described and experimentally demonstrated a two-dimensional aliasing-free beam steering regime for an integrated OPA with the entire 180° field of view (FOV). They achieved this by using a half-wavelength-pitch waveguide array combined with a trapezoidal slab grating as a single emitter. The OPA had a low sidelobe level of <−19dB while the beam was steered from −40∘ to +40∘, breaking the trade-off between FOV […]