Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film

Kalpana Singh, Evgeniy Panchenko, Babak Nasr, Amelia Liu, Lukas Wesemann, Timothy J. Davis, Ann Roberts

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Abstract

Here we present the results of an investigation of resonances of azimuthal trimer arrangements of rectangular slots in a gold film on a glass substrate using cathodoluminescence (CL) as a probe. The variation in the CL signal collected from specific locations on the sample as a function of wavelength and the spatial dependence of emission into different wavelength bands provides considerable insight into the resonant modes, particularly sub-radiant modes, of these apertures. By comparing our experimental results with electromagnetic simulations we are able to identify a Fabry-Pérot mode of these cavities as well as resonances associated with the excitation of surface plasmon polaritons on the air-gold boundary. We obtain evidence for the excitation of dark (also known as sub-radiant) modes of apertures and aperture ensembles.

Original languageEnglish
Pages (from-to)1491-1500
Number of pages10
JournalBeilstein Journal of Nanotechnology
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Cathodoluminescence
  • Plasmonics

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