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Twisting Fluorescence through Extrinsic Chiral Antennas.

Chen Yan1, Xiaolong Wang1, T V Raziman1

  • 1Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology (EPFL) , CH-1015 Lausanne, Switzerland.

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Summary

Extrinsic chiral surfaces twist molecular fluorescence into multipolar radiation. This plasmonic nanostructure design enables control over light polarization, splitting circularly polarized light and paving the way for advanced optical devices.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Chiral optics

Background:

  • Plasmonic antennas and planar structures are crucial for controlling light scattering and absorption.
  • Extrinsic chiral surfaces, lacking 2-fold rotational symmetry, show asymmetric transmission for circularly polarized light under oblique incidence.

Purpose of the Study:

  • To optimize extrinsic chiral surfaces using complex multipolar resonances.
  • To demonstrate the twisting of fluorescence emission from nearby molecules into multipolar radiation patterns with controlled helicity.

Main Methods:

  • Design and optimization of plasmonic nanostructures with complex multipolar resonances.
  • Experimental investigation of light-matter interactions and polarization control.
  • Analysis of near-field absorption and far-field scattering properties.

Main Results:

  • Achieved twisting of usually dipolar and linearly polarized fluorescence into multipolar radiation with opposite helicity in different directions.
  • Experimental demonstration of splitting left- and right-handed circularly polarized light in the backward direction.
  • Maximized the effect of polarization control through optimized surface design.

Conclusions:

  • The study highlights the interplay between near-field absorption and far-field scattering in plasmonic nanostructures.
  • The findings enable modification of emission from incoherent quantum sources.
  • Potential applications include polarization- and angle-resolved ultracompact optical devices.