Design of Compact Orbital Angular Momentum (OAM) Beams Generator on an Integrated Silicon Platform

Abstract

We present a compact integrated structure to generate optical orbital angular momentum (OAM) beams, where a simple waveguide structure with a trench is formed on a silicon platform. Numerical simulations show that OAM beams with topological charges of ±1 could be achieved over a wide wavelength range from $1.45\ \mu \text{m}$ to $1.65\ \mu \text{m}$.