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Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation
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Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation
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Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation
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Paper
Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation
2025
Overview
The integrated devices that generate structured optical fields with non-trivial orbital angular momentum (OAM) hold great potential for advanced optical applications, but are restricted to complex nanostructures and static functionalities. Here, we demonstrate a reconfigurable OAM beam generator from a simple microring resonator without requiring grating-like nanostructures. Our approach harnesses Brillouin interaction between confined phonon and optical modes, where the acoustic field is excited through microwave input. The phonon stimulate the conversion from a guided optical mode into a free-space vortex beam. Under the selection rule of the radiation, the OAM order of the emitted light is determined by the acousto-optic phase matching and is rapidly reconfigurable by simply tuning the microwave frequency. Furthermore, this all-microwave control scheme allows for the synthesis of arbitrary high-dimensional OAM superpositions by programming the amplitudes and phases of the driving fields. Analytical and numerical models predict a radiation efficiency over 25\\% for experimentally feasible on-chip microcavities. This work introduces a novel paradigm for chip-to-free-space interfaces, replacing fixed nanophotonic structures with programmable acousto-optic interactions for versatile structured light generation.
Publisher
Cornell University Library, arXiv.org
