Abstract
An integrated device, which consists of a variable amplitude splitter and an orbital angular momentum (OAM) emitter, is proposed for the superposition of optical vortex beams. With fixed wavelength and power of incident beam, the OAM of the radiated optical superimposed vortex beam can be dynamically tuned. To verify the operating principle, the proposed device has been fabricated on the SOI substrate and experimentally measured. The experimental results confirm the tunability of superimposed vortex beams. Moreover, the ability of independently varying the OAM flux and the geometric distribution of intensity is illustrated and discussed with numerical simulation. We believe that this work would be promising in various applications.
Highlights
An orbital angular momentum (OAM) emitter based on a ring cavity
Based on the above concept, an integrated device is proposed for the superposition of vortex beams as shown in Fig. 1, which is consisted of two components, i.e., a VAS and an OAM emitter
The corresponding amplitude ratio is r = 1. All these results indicate that the OAM of the Superimposed vortex (SV) beam could be dynamically tuned by varying the amplitude ratio r of incident beam
Summary
An OAM emitter based on a ring cavity. In the VAS, an incident beam is firstly divided into two beams. After injected into the emitter, two collinear vortex beams would be scattered into free space by grating elements, with equal but opposite topological charges. These two vortex beams are coupled into a SV beam naturally. The proposed device has been fabricated on the SOI substrate with a thermal tuning unit. With comparison between the numerical and experimental results, generation of SV beams with tunable OAM is confirmed. It is theoretically explained in detail how the dependence of the OAM flux and the geometric distribution of intensity could be successfully decoupled
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