Journal
NANO LETTERS
Volume 9, Issue 5, Pages 2139-2143Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl900694r
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Funding
- Israeli Science Foundation
- Israeli Ministry of Science, Culture, and Sport
- Peter Brojde Center for Innovative Engineering and Computer Science
- Eshkol Fellowship
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We experimentally demonstrate the focusing of surface plasmon polaritons by a plasmonic lens illuminated with radially polarized light. The field distribution is characterized by near-field scanning optical microscope. A sharp focal spot corresponding to a zero-order Bessel function is observed. For comparison, the plasmonic lens is also measured with linearly polarized light illumination, resulting in two separated lobes. Finally, we verify that the focal spot maintains its width along the optical axis of the plasmonic lens. The results demonstrate the advantage of using radially polarized light for nanofocusing applications involving surface plasmon polaritons.
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