Frequency conversion of vortex states by chiral forward Brillouin scattering in twisted photonic crystal fibre
arxiv(2024)
摘要
Optical vortex states-higher optical modes with helical phase progression and
carrying orbital angular momentum-have been explored to increase the
flexibility and capacity of optical fibres employed for example in
mode-division-multiplexing, optical trapping and multimode imaging. A common
requirement in such systems is high fidelity transfer of signals between
different frequency bands and modes, which for vortex modes is not so
straightforward. Here we report intervortex conversion between
backward-propagating circularly polarised vortex modes at one wavelength, using
chiral flexural phonons excited by chiral forward stimulated Brillouin
scattering at a different wavelength. The experiment is carried out using
chiral photonic crystal fibre, which robustly preserves circular polarisation
states. The chiral acoustic wave, which has the geometry of a spinning
single-spiral corkscrew, provides the orbital angular momentum necessary to
conserve angular momentum between the coupled optical vortex modes. The results
open up new opportunities for interband optical frequency conversion and the
manipulation of vortex states in both classical and quantum regimes.
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