Silicon optical phased array with a 180-degree field of view for 2D optical beam steering

Optical phased arrays (OPAs), the optical counterpart of at radio frequencies, can electronically steer an beam without any moving parts. To achieve a 180° field view (FOV), array emitters should be spaced half-wavelength apart or less. However, conventional OPA based on waveguide grating suffers from strong cross talk between adjacent waveguides when pitch is Here, we theoretically describe and experimentally demonstrate two-dimensional aliasing-free steering regime for integrated with entire FOV. We this by using half-wavelength-pitch combined trapezoidal slab as single emitter. Our also features low sidelobe level &lt; −<!-- − <mml:mn>19 d mathvariant="normal">B while steered 40 ∘<!-- ∘ </mml:msup> to + , breaking trade-off FOV quality. The chip-based large range high quality provides promising route compact, solid-state, cost-effective, high-performance light detection ranging system, enabling wide classical quantum applications.