s-SNOM phase and amplitude images of surface plasmon polariton (SPP) on a graphene wedge. (left) s-SNOM phase with a line cross-section of the SPP standing wave; (right) s-SNOM amplitude. Top image is a 3D view of Phase image (left).
Nano imaging of surface phonon polaritons (SPhP) on hexagonal boron nitride (hBN). (a) AFM height image shows homogeneous hBN surface with different layers on Si substrate; (b) s-SNOM amplitude shows strong interference fringes due to propagating SPhP along the surface on hBN; (c) s-SNOM phase shows a difference phase with layer thickness. From the image b and c, we can also see the wavelength of the SPhP changes with the number of layers.
s-SNOM point spectroscopy
Optical spectroscopy and imaging with s-SNOM. Point spectrum of s-SNOM gives complex optical property of the sample (top right), with both amplitude and phase of scattered light from interferometric detection (top left). s-SNOM phase image of a defect on-resonance and off-resonance (bottom).
s-SNOM measurements of purple membrane reveal distribution of protein within the lipid membrane. AFM height (top); s-SNOM phase image with IR source tuned to the amide I absorption band (bottom left); s-SNOM phase image off-resonance (bottom right).