Near-field circular polarization probed by chiral polyfluorene

M. Savoini, P. Biagioni, G. Lakhwani, S.C.J. Meskers, L. Duò, M. Finazzi

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)

Abstract

We demonstrate that a high degree of circular polarization can be delivered to the near field (NF) of an aperture at the apex of hollow-pyramid probes for scanning optical microscopy. This result is achieved by analyzing the dichroic properties of an annealed thin polymer film containing a chiral polyfluorene derivative, placed in close proximity to the optical probe. We also prove that the degree of circular polarization in the probe NF does not depend in a significant way on the shape of the aperture, at variance with the far-field behavior. These results demonstrate the feasibility of nano-optics applications exploiting circularly polarized NFs.
Original languageEnglish
Pages (from-to)3571-3573
JournalOptics Letters
Volume34
Issue number22
DOIs
Publication statusPublished - 2009

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