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Scanning electron micrographs of plasmonic ring antenna with radius r = 300 nm and groove depth d = 500 nm. (b) FIB-milled cross-section through a ring antenna infilled with a dye-doped PVB polymer layer. Scale bars: 200 nm.
(Color) Resonance spectra of a single ring antenna (r = 225 nm, d = 50 nm) before and after infilling with dye-containing polymer. Black curve: cathodoluminescence spectrum, showing a clear resonant peak. Red curve: relative white-light reflection spectrum showing a Fano line shape at the resonance wavelength. As a result of a polymer layer covering the antenna, the white-light reflection spectrum red shifts (blue curve). Green curve: fluorescence enhancement of dye molecules incorporated in the polymer layer.
(Color) Normalized fluorescence spectrum of ATTO 680 dye embedded in PVB inside a r = 225 nm, d = 50 nm plasmon ring cavity (red). A reference spectrum from dye in a 10 nm polymer layer on unstructured Au is also shown (black). The fluorescence enhancement in the ring cavity is shown by the green curve (λ pump = 640 nm).
(Color) Confocal microscopy scan of ATTO680 fluorescence in an array of 17 × 20 ring cavities. The rings have groove depths ranging from 25 nm (bottom) to 500 nm (top) and radii of 100 nm (left)–300 nm (right). Excitation was at 640 nm. Plotted in these scans is the fluorescence in a 10-nm band around (a) 710 nm and (b) 800 nm. Data are normalized to fluorescence of the planar part of the Au substrate. Scale bar: 10 μm.
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