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arXiv · 2306.05209

Multiplication of the orbital angular momentum of phonon polaritons via sublinear dispersion

Andrea Mancini·Lin Nan·Rodrigo Berté·Emiliano Cortés·Haoran Ren·Stefan A. Maier
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Abstract

Optical vortices (OVs) promise to greatly enhance optical information capacity via orbital angular momentum (OAM) multiplexing. The need for on-chip integration of OAM technologies has prompted research into subwavelength-confined polaritonic OVs. However, the topological order imprinted by the structure used for the transduction from free-space beams to surface polaritons is inherently fixed after fabrication. Here, we overcome this limitation via dispersion-driven topological charge multiplication. We switch the OV topological charge within a small $\sim 3 \%$ frequency range by leveraging the strong sublinear dispersion of low-loss surface phonon polaritons (SPhP) on silicon carbide membranes. Applying the Huygens principle we quantitatively evaluate the topological order of the experimental OVs detected by near-field imaging. We further explore the deuterogenic effect, which predicts the coexistence of multiple topological charges in higher-order polaritonic OVs. Our work demonstrates a viable method to manipulate the topological charge of polaritonic OVs, paving the way for the exploration of novel OAM-enabled light-matter interactions at mid-infrared frequencies.

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Andrea Mancini, Lin Nan, Rodrigo Berté, Emiliano Cortés, Haoran Ren, Stefan A. Maier. 2023-06-08. Multiplication of the orbital angular momentum of phonon polaritons via sublinear dispersion. https://arxiv.org/abs/2306.05209

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