Nanoscale Infrared Contrast Imaging of Ultrathin Samples with Surface Phonon Polariton Enhanced Photoinduced Dipole Force (IMAGE)
Caption
Phonon polariton enhanced nano-IR contrast imaging platform. (a) Sketch of the substrate-enhanced nano-IR contrast imaging platform based on a polar crystal substrate under the metallic tip. (b) Typical PiFM spectra were observed on the sample near its IR resonance and on the substrate near the tip-induced nearfield resonance. (c, d) Schematics for imaging of (c) PiTF of sample and (d) PiDF of the substrate and on a layered sample deposited on a PiDF-dominant substrate as depicted in (a).
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