Near-field infrared nanospectroscopy of surface phonon-polariton resonances

We present combined experimental and numerical work on light-matter interactions at nanometer length scales. We report numerical simulations of near-field infrared nanospectroscopy that consider detailed tip geometry and have no free parameters. Our results match published spectral shapes of amplitu...

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Bibliographic Details
Published in:Physical review research 2020-06, Vol.2 (2), p.023272, Article 023272
Main Authors: McArdle, P., Lahneman, D. J., Biswas, Amlan, Keilmann, F., Qazilbash, M. M.
Format: Article
Language:English
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Summary:We present combined experimental and numerical work on light-matter interactions at nanometer length scales. We report numerical simulations of near-field infrared nanospectroscopy that consider detailed tip geometry and have no free parameters. Our results match published spectral shapes of amplitude and phase measurements even for strongly resonant surface phonon-polariton (SPhP) modes. They also verify published absolute scattering amplitudes. A unique, ultrabroadband light source enables near-field amplitude and phase acquisition into the far-infrared spectral range. This allowed us to discover a strong SPhP resonance in the polar dielectric SrTiO_{3} (STO) at an ∼24-μm wavelength of incident light.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.2.023272