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Spectral interferometric microscopy reveals absorption by individual optical nanoantennas from extinction phase.

Sylvain D Gennaro1, Yannick Sonnefraud1, Niels Verellen2

  • 1Department of Physics, The Blackett Laboratory, Imperial College London, London SW7 2AZ, UK.

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|May 1, 2014
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We developed a new microscopy technique to measure the amplitude and phase of optical antennas. This method reveals hidden absorption information, crucial for understanding light-matter interactions at the nanoscale.

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Area of Science:

  • Nanophotonics and Plasmonics
  • Optical Metrology
  • Spectroscopy

Background:

  • Optical antennas are nanoscale devices that concentrate light, enabling strong light-matter interactions.
  • Measuring the amplitude and phase response of individual optical antennas is challenging due to their small size and high frequencies.
  • Existing techniques often lack the resolution or spectral range to fully characterize these antennas.

Purpose of the Study:

  • To introduce a novel spectral interferometric microscopy technique for characterizing individual optical antennas.
  • To demonstrate the ability to measure amplitude and phase response across the visible to near-infrared spectrum.
  • To show that far-field measurements can quantitatively estimate near-field absorption properties.

Main Methods:

  • Development of a spectral interferometric microscopy setup.
  • Characterization of individual gold ring-disk dimer nanoantennas exhibiting Fano interference.
  • Analysis of extinction phase to determine nanoantenna absorption.

Main Results:

  • The technique successfully maps the amplitude and phase response of optical antennas over an octave bandwidth.
  • Quantitative estimation of nanoantenna absorption from far-field extinction phase measurements is achieved.
  • Fano interference in gold ring-disk dimers was found to primarily cancel scattering, with absorption dominating extinction.

Conclusions:

  • Spectral interference microscopy provides a powerful tool for full-field characterization of optical antennas.
  • This method enables quantitative near-field absorption measurements using far-field optical signals.
  • The technique has broad applications in quantum and classical optics, materials science, and life sciences.