Subwavelength resolution scanning diffracted-light microscopy using plasmonic ultra-thin condensers

Abstract

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. We used a rotating slit placed at the back focal plane of the microscope’s objective lens to scan the light diffracted by a plasmonic crystal, which had a period smaller than the resolution limit of the optical microscope. A set of images were collected at different orientations of the slit. A high-resolution image of the plasmonic crystal was obtained by processing the experimental images using a numerical Fourier ptychographic algorithm. Supporting simulations of the experiments are also presented.