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  • 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 2019),
  • paper ch_8_2

Picometre Resolution Measurement of Plasmonic Dynamics in Metal Nanostructures using Frequency Comb

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Abstract

The plasmonic phenomenon of extra-ordinary optical transmission (EOT) [1] refers to the interaction of the light and a metallic film perforated with the subwavelength holes. It provides a larger transmission of electromagnetic fields than the expected values by classical optics [2]. Most precedent researches have been based on intensity measurements. Meanwhile, in optical spectroscopy, broadband phase spectra are known to provide richer, linear, and more direct sources of information on target samples compared to traditional intensity spectra [3]. The direct acquisition of phase spectra, however, has proven difficult in plasmonics, owing to the critical requirements for highly stabilised light sources, coherent optical interferometers, and stable optical paths. The frequency comb provides millions of well-defined optical modes over a broad spectrum with a high phase coherence referenced to an atomic clock of a time standard [5]. Herein, this research demonstrates an interferometric approach to measure the plasmonic EOT phase using a frequency comb as a novel light source for plasmonics [4].

© 2019 IEEE

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