Optical constants from scattering-type scanning near-field optical microscope
Published in Applied Physics Letters, 2021
We develop a model-free calibration procedure for extracting complex optical constants from s-SNOM measurements, without requiring the tip-sample interaction model details nor the exact knowledge of tip geometry or so on. 
Recommended citation: Guo X, Bertling K, Rakić AD. Optical constants from scattering-type scanning near-field optical microscope. Applied Physics Letters. 2021 Jan 25;118(4).
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