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

Research output: Contribution to journalArticleResearchpeer-review

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

Cite this

Singh, Kalpana ; Panchenko, Evgeniy ; Nasr, Babak ; Liu, Amelia ; Wesemann, Lukas ; Davis, Timothy J. ; Roberts, Ann. / Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film. In: Beilstein Journal of Nanotechnology. 2018 ; Vol. 9, No. 1. pp. 1491-1500.
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Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film. / Singh, Kalpana; Panchenko, Evgeniy; Nasr, Babak; Liu, Amelia; Wesemann, Lukas; Davis, Timothy J.; Roberts, Ann.

In: Beilstein Journal of Nanotechnology, Vol. 9, No. 1, 01.01.2018, p. 1491-1500.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Panchenko, Evgeniy

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AU - Davis, Timothy J.

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AB - 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.

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