Hybrid Ghost Phonon Polaritons in Thin-Film Heterostructure.
basic_science · Level V
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- Record sourced from PubMed, PMID 38587212.
- Also identified by DOI 10.1021/acs.nanolett.3c04550.
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Abstract
Ghost phonon polaritons (g-PhPs), a unique class of phonon polaritons in the infrared, feature ultralong diffractionless propagation (>20 μm) across the surface and tilted wavefronts in the bulk. Here, we study hybrid g-PhPs in a heterostructure of calcite and an ultrathin film of the phase change material (PCM) In<sub>3</sub>SbTe<sub>2</sub>, where the optical field is bound in the PCM film with enhanced confinement compared with conventional g-PhPs. Near-field optical images for hybrid g-PhPs reveal a lemniscate pattern in the momentum distribution. We fabricated In<sub>3</sub>SbTe<sub>2</sub> gratings and investigated how different orientations and periodicities of gratings impact the propagation of hybrid g-PhPs. As the grating period decreases to zero, the wavefront of hybrid g-PhPs can be dynamically steered by varying the grating orientation. Our results highlight the promise of hybrid g-PhPs with tunable functionalities for nanophotonic studies.