Abstract
We investigate the influence of circular corrugations surrounding a central nanoaperture to further enhance the fluorescence count rate per emitter and control its emission directionality. Adding a single corrugation already allows to significantly increase the fluorescence signal as compared to a bare nanoaperture. A complete fluorescence characterization quantifies the excitation and emission gains contributing to the fluorescence enhancement process as the number of corrugations is increased.
Highlights
Photonic nanostructures are receiving a considerable interest to enhance and control the luminescence properties of a single quantum emitter [1,2,3,4]
We investigate the influence of circular corrugations surrounding a central nanoaperture to further enhance the fluorescence count rate per emitter and control its emission directionality
A complete fluorescence characterization quantifies the excitation and emission gains contributing to the fluorescence enhancement process as the number of corrugations is increased
Summary
Photonic nanostructures are receiving a considerable interest to enhance and control the luminescence properties of a single quantum emitter [1,2,3,4]. Adding a periodic circular grating ( known as the Bull’s eye structure) around the central aperture enables further control on the light-matter interaction, to improve the transmission efficiency and directionality [6, 7], enhance the non-linear conversion efficiency [8], or realize a photodiode with high-speed response [9]. An exhaustive exploration of the design parameters defining the corrugated nanoaperture is at hand for the optical transmission process [10]. For the molecular fluorescence process, it has been demonstrated very recently that an optimized nanoaperture surrounded by 5 circular corrugations can significantly enhance the fluorescence count rates per molecule and control the emission directivity [11]. Many studies still deserve to be done to understand how the many design parameters for corrugated nanoapertures influence the fluorescence enhancement process
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