Yanwang Zhai

Area of research

Atomic and Molecular Physics, and Optics · Electronic, Optical and Magnetic Materials

Research interest

Research topics from publications: Universal orbital angular momentum spectrum analyzer for beams; Demonstration of free-space one-to-many multicasting link from orbital angular momentum encoding; Remote detection of a rotator based on rotational Doppler effect; The radial Doppler effect of optical vortex beams induced by a surface with radially moving periodic structure. Representative work: Abstract The orbital angular momentum (OAM) of beams provides a new dimension, and have already found lots of applications in various domains. Among such applications, the precisely and quantitatively diagnostic of intensity distributions among different OAM modes, namely the OAM spectrum of a beam, is of great significance. In this paper we propose and experimentally validate a simple interferential method to achieve this goal. By analyzing the interference pattern formed by the beam and a reference field, the OAM spectrum can be obtained instantaneously. Furthermore, the proposed method is also available for more complex light fields, for instance, the multi-ring optical vortices. In the p Multicasting is necessary when distributing signals between multiple users. In this Letter, we demonstrate an orbital angular momentum (OAM) encoding-based free-space one-to-many multicasting link, where digital signals are encoded into a series of time-varying OAM states and transmitted from one transmitter to multiple receivers with various locations. Moreover, encoding N various signals simultaneously in one transmitter and sending them at the same time to N various receivers separately, is also demonstrated. As a proof-of-concept, four different gray images are coded by one transmitter simultaneously and multicast to four various receivers separately. The favorable decoding results retur

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