Phase stepping interferometry is used to measure the size of near-cylindrical nanowires. Nanowires with nominal radii of 25 nm and 50 nm were used to test this by comparing specific measured optical phase profile values with theoretical values calculated using a wave-optic model of the Phase stepping interferometry (PSI) system. Agreement within 10% was found, which enabled nanowire radii to be predicted within 4% of the nominal value. This demonstration highlights the potential capability for phase stepping interferometry to characterize single nanoparticles of known geometry in the optical far-field.
Phase-stepping interferometry of GaAs nanowires: Determining nano-wire radius
D. J. Little, R. L. Kuruwita, A. Joyce, Q. Gao, T. Burgess, C. Jagadish, D. M. Kane; Phase-stepping interferometry of GaAs nanowires: Determining nano-wire radius. Appl. Phys. Lett. 14 October 2013; 103 (16): 161107. https://doi.org/10.1063/1.4825153
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