The near-field scans were obtained using a commercially available s-SNOM from NeaSpec, which is based on a tapping-mode AFM. QCL was used as a tunable mid-IR source from Daylight Solutions. An IR beam from a QCL was focused onto a PtIr-coated Si tip (diameter, ~20 nm) to launch the phonon polariton modes. The backscattered signal was demodulated at the higher pseudo-heterodyne harmonics (n ≥ 2) to reduce the background. Details of the separation of the direct, roundtrip, and material contrast contributions are presented in the Supplementary Materials.

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