Apertureless scattering-type Scanning Near-field Optical Microscopy (s-SNOM) has been used to study the electromagnetic response of infrared antennas below the diffraction limit. The ability to simultaneously resolve the phase and amplitude of the evanescent field relies on the implementation of several experimentally established background suppression techniques. We model the interaction of the probe with a patch antenna using the Finite Element Method (FEM). Green's theorem is used to predict the far-field, cross-polarized scattering and to construct the homodyne amplified signal. This approach allows study of important experimental phenomena, specifically the effects of the reference strength, demodulation harmonic, and detector location.
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Arvindvivek Ravichandran ; Edward C. Kinzel ; James C. Ginn ; Jeffery A. D'Archangel ; Eric Z. Tucker, et al.
Numerical modeling of scattering type scanning near-field optical microscopy
", Proc. SPIE 8815, Nanoimaging and Nanospectroscopy, 88150S (September 20, 2013); doi:10.1117/12.2023513; http://dx.doi.org/10.1117/12.2023513