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Schematic of the experiment setup.
Experimental (left) and simulation (right) results of the cogwheel beam with topological charge .
Illustration of SPR excitation by the cogwheel mode, the radius of which is modulated to satisfy the SPR angle.
[(a) and (e)] Excitation of fluorescence by far-field cogwheel beams. [(b) and (f)] Excitation of fluorescence by localized SP intensity patterns. (c) The light reflected from bottom of the sample and relayed to CCD. (d) Calculated magnitude of reflection coefficient versus incident angles. [(a)–(c)] ; [(e)–(f)] .
(a) Cogwheel beam ; [(b)–(e)] Normalized intensity distribution and its components in the focal field illuminated by a high focused cogwheel mode . (b) ; (c) ; (d) ; (e) . Units of axes: .
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