Figure 4
From: Thermal near-field scattering characteristics for dielectric materials
Near-field signals obtained with passive LWIR s-SNOM. (a) A schematic of the CSIP signal during the near-field measurements. (b) The probe-apex area contributing to the scattering of the evanescent waves in active and passive s-SNOM. (c) Calculated (hp = 30 nm, d = 100 nm) and experimentally obtained near-field decay curve on Au at the fundamental frequency (Ω = 14 Hz) using passive LWIR spectroscopic s-SNOM (m = 0).
