Design of 2D Optical Phased Array Emitters with Half-Wavelength Spacing and Less than −20 dB Crosstalk

We propose a multi-layered, 2D optical phased array capable of 180° × 180° beam steering range without wavelength tuning. Evanescent coupling between half-wavelength spaced waveguides is suppressed below −20 dB through index-mismatch and extreme skin-depth metamaterial waveguides.