Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (2): 286-292.doi: 10.3969/j.issn.1007-5461.2022.02.008

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Recognition of polarization rotation in vector vortex beam enabled by rotational Doppler effect

JIA Junliang1,2,3, ZHANG Xiaoru2, ZHAO Zidan2, ZHANG Pei1,2,3∗   

  1. ( 1 National Demonstration Center for Experimental College Physics Education, Xi’an Jiaotong University, Xi’an 710049, China; 2 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi’an Jiaotong University, Xi’an 710049, China; 3 Shaanxi Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, Xi’an Jiaotong University, Xi’an 710049, China )
  • Received:2021-10-06 Revised:2021-11-30 Published:2022-03-28 Online:2022-03-28

Abstract: Vectorial vortex beam possesses unique advantages in the fields of micro optical manipulation and optical communication. Rotational Doppler effect is usually applied in the researches of topological charges of optical vortex, and analysis of rotational Doppler effect of vectorial vortex beam is meaningful to deduce properties of polarization. Here a method to discriminate the direction of rotation of cylindrical vector beams is proposed based on rotational Doppler effect. In the method, the scattered light of an incident vectorial vortex beam carries beating signal whose intensity changes periodically with time due to Doppler frequency shift. The phase of the beating signal variation function depends on equator angle
of vectorial vortex on high-order Poincar´e sphere and the slope of the function depends on topological
charge of optical vortex. The measurement theory of beating signals of two vectorial vortex beams with
opposite handnesses are proposed and experimentally verified, which provides a new effective method to
measure the signs of topological charges of cylindrical vector beams.

Key words: optical communication, vector vortex beam, higher-order Poincar′e sphere, rotational Doppler effect, topological charges of vector vortex

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