KEYWORDS: Surface plasmons, Near field scanning optical microscopy, Plasmonics, Near field optics, Gold, Microscopy, Scanning electron microscopy, Free space optics, Numerical simulations, Glasses
Surface plasmons have been launched from free space optical beams (at an excitation wavelength of 700 nm) and
focused in the plane using concentric curved gratings (or plasmonic lenses) etched into 30 nm-thick gold films. The
performance of these devices was studied with numerical simulation and verified by near-field scanning optical
microscopy experiments. These plasmonic lenses have been demonstrated to focus the launched surface plasmons
effectively to a high intensity focal spot.
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