Plasmonics of thin film quasitriangular nanoparticles

We investigate optical responses of arrays of flat, quasitriangular nanoparticles made by the self-assembly sphere lithography of a 20 nm thick gold film. The measured optical absorption spectra show strong, particle size dependent resonances, in excellent agreement with our simulations. We identify those resonances as due to standing surface/edge plasmon-polariton waves.

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