Fig. 1: Tailoring the local conductivity of SNO (SmNiO3).
From: Reconfigurable hyperbolic polaritonics with correlated oxide metasurfaces
a Schematics of integrated s-SNOM (Scattering type Scanning Near-field Optical Microscopy) and heating setup, in case of conductive writing tip is biased. b AFM (Atomic Force Microscopy) topography image of pristine SNO. c SKPM (Scanning Kelvin Probe Microscopy) surface potential image of conductive writing patterns on pristine SNO made by applying 5–10 V potential at the c-AFM (Conductive AFM) tip, corresponding infrared s-SNOM second harmonic near-field amplitude s2 images at d T = 23 °C (no H2 exposure), e T = 82 °C (no H2 exposure), f T = 23 °C, after exposing to 5% H2 gas at 100 °C, g T = 82 °C, after exposing to 5% H2 gas at 100 °C. All samples were imaged at λ = 10.5 µm. h Normalized amplitude plots with and without H2 exposure. i Normalized amplitude plots with and without H2 exposure at T = 25 °C (blue lines) and normalized potential plot of regions A–F (green line) as a function of voltage. All data points of plots were taken at regions with different potential (A–F) shown in panel (c), and reference to normalize amplitude data is taken at * in panel (c). Scale bars indicate 3 µm.
