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Title: Singular diffraction-free surface plasmon beams generated by overlapping phase-shifted sources
Authors: Wei, S.
Lin, J.
Wang, Q.
Yuan, G.
Du, L.
Wang, R.
Xu, L.
Hong, M. 
Min, C.
Yuan, X.
Issue Date: 1-Apr-2013
Citation: Wei, S., Lin, J., Wang, Q., Yuan, G., Du, L., Wang, R., Xu, L., Hong, M., Min, C., Yuan, X. (2013-04-01). Singular diffraction-free surface plasmon beams generated by overlapping phase-shifted sources. Optics Letters 38 (7) : 1182-1184. ScholarBank@NUS Repository.
Abstract: We propose and experimentally demonstrate the singular surface plasmon beam that presents a dark channel generated by a point dislocation and a long diffraction-free propagation distance up to 70λsp. The singular surface beam is the result of the interference of two surface plasmon polariton (SPP) plane waves, which are launched by two coupling gratings with lateral displacement. An aperture-type near-field scanning optical microscope is used to map the intensity distribution of the singular SPP waves. The propagating point dislocation embedded in the beam is shown by full-wave calculations and is later verified by near-field interference in the experiment. © 2013 Optical Society of America.
Source Title: Optics Letters
ISSN: 01469592
DOI: 10.1364/OL.38.001182
Appears in Collections:Staff Publications

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