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We previously reported [Naruse, et al. Sci. Rep. 4, 6077, 2014] that thegeometrical randomness of disk-shaped silver nanoparticles, which exhibit highreflection at near-infrared wavelengths, serves as the origin of aparticle-dependent localization and hierarchical distribution of opticalnear-fields in the vicinity of the nanostructure. In this study, we show thatthe induced polarizations are circular, particularly at resonant wavelengths.We formulate optical near-field processes between nanostructures, accountingfor their polarizations and geometries, and attribute circular polarization tothe layout-dependent phase difference between the electrical susceptibilitiesassociated with longitudinal and transverse-electric components. This studyclarifies the fundamental optical properties of random nanostructured matterand offers generic theoretical concepts for implementing nanoscalepolarizations of optical near-fields.

Local circular polarizations in nanostructures induced by linear polarization via optical near-fields