Detection and Demultiplexing of Cylindrical Vector Beams Enabled by Rotational Doppler Effect

Abstract

Cylindrical vector beams (CVBs) detection is of vital significance in various kinds of studies such as particle observation and mode‐division multiplexing (MDM). Herein, a comprehensive detection of CVBs based on the rotational Doppler effect (RDE) including analysis of topological charge (TC), relative amplitude module, and phase for superimposed mode bases is realized. A mode demultiplexing scheme is constructed through the complex amplitude of the harmonic terms in the beating signal. The method resolves both absolute values and signs of the TC of CVB simultaneously, which cannot be simply realized by existing polarization examination techniques. It may be of big potential in related research since an efficient, quantitative, and complete scheme to detect CVBs is verified starting from this work.

Keywords

• cylindrical vector beam
• orbital angular momentum
• rotational Doppler effect