Ultrathin samples with surface phonon polariton enhance photoinduced dipole force

https://phys.org/news/2024-05-ultrathin-samples-surface-phonon-polariton.html

"IR photoinduced quartz force spectral response of quartz follows real rather than imaginary part of quartz dielectric function due to quartz's unique surface phonon polariton extremely enhancing photoinduced dipole force... more conspicuous signal variation with respect to sample thickness... PiDF can be employed for sensitive nano-IR imaging of 2D samples under nanocavity geometry with improved contrast, sensitivity... high-resolution nanoimaging crystals, polymer/ bio molecules with known vibrational mode frequencies"