High-Power Millimeter-Wave Orbital Angular Momentum Mode Identification Using Double Slit Interference

Abstract

Recently, electromagnetic waves possessing orbital angular momentum (OAM) have been widely studied recently in the optical and microwave regimes. In this article, we present a method for identifying OAM modes in the millimeter-wave regime, where direct phase measurements are not feasible in high-power environments. Instead, we rely on intensity measurements for OAM mode discrimination. Inspired by the fact that OAM beams exhibit asymmetric phase patterns, we used a method for OAM mode discrimination based on the interference pattern after passing through a double slit. Up to our knowledge, this article presents the first gyrotron-based OAM mode identification with the introduction of a method that uses Young's double slit interference. The proposed OAM mode discrimination method can be effectively applied to realize millimeter-wave wireless communication using OAM beams.