Twisting fluorescence through extrinsic chiral antennas

Chen Yan, Xiaolong Wang, T. V. Raziman, Olivier J.F. Martin

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

Abstract

Plasmonic antennas and planar structures have been undergoing intensive developments in order to control the scattering and absorption of light. One specific class, extrinsic chiral surfaces, that does not possess 2-fold rotational symmetry exhibits strong asymmetric transmission for different circular polarizations under obliquely incident illumination. In this work, we show that the design of those surfaces can be optimized with complex multipolar resonances in order to twist the fluorescence emission from nearby molecules. While this emission is usually dipolar and linearly polarized, the interaction with these resonances twists it into a multipolar radiation pattern with opposite helicity in different directions. The proposed structure maximizes this effect and provides control over the polarization of light. Splitting of left- and right-handed circularly polarized light is experimentally obtained in the backward direction. These results highlight the intricate interplay between the near-field absorption and the far-field scattering of a plasmonic nanostructure and are further used for modifying the emission of incoherent quantum sources. Our finding can potentially lead to the development of polarization- and angle-resolved ultracompact optical devices.

Original languageEnglish
Pages (from-to)2265-2272
Number of pages8
JournalNano Letters
Volume17
Issue number4
DOIs
Publication statusPublished - 12 Apr 2017
Externally publishedYes

Keywords

  • extrinsic chirality
  • fluorescence emission
  • k-space polarimetry
  • multipolar resonances
  • Plasmonic nanoantennas

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