Journal
NANO LETTERS
Volume 10, Issue 6, Pages 2075-2079Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100340w
Keywords
Surface plasmons; polarization selective devices; polarimetry; optical near-field
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A spiral plasmonic lens can focus circular polarization of a given handedness while simultaneously defocus the circular polarization of the opposite chirality, which may be used as a miniature circular polarization analyzer. In this letter, we experimentally investigated the plasmonic focusing properties of the spiral lens using a collection mode near-field scanning optical microscope. A single Archimedes' spiral slot with a single turn was etched through gold thin film as a spiral plasmonic lens. The plasmonic field at the focus of a spiral lens strongly depends on the spin of the incident photon. Circular polarization extinction ratio better than 50 is obtainable with a device size as small as only 4 times of surface plasmon wavelength.
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