Journal article

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

BEILSTEIN JOURNAL OF NANOTECHNOLOGY | BEILSTEIN-INSTITUT | Published : 2018

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 th..

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