Properties of surface plasmon polaritons excited by generalized cylindrical vector beams
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Properties of surface plasmon polaritons (SPPs) excited by generalized cylindrical vector (CV) beams in high-numerical-aperture microscopic system are investigated both theoretically and experimentally. The CV beams can be decomposed into radial and azimuthal polarization components with different weights, and only the radial polarization component is able to excite SPPs in our system; thus, the total field on the metal film contributed by both the excited SPPs and directly transmitted fields is completely determined by the ratio between radial and azimuthal components of the incident CV beam. A variety of total field distributions such as virtual probe, flat-topped pattern, and doughnut can dynamically be obtained through simply selecting the desired CV beams.
KeywordsSurface Plasmon Polaritons Deviation Angle Electric Field Distribution Total Field Silver Film
This work was partially supported by the National Natural Science Foundation of China under Grant Nos. (61036013, 61138003, 11204141, and 61377052), Tianjin Municipal Science and Technology Commission under Grant No. 11JCZDJC15200, and Specialized Research Fund for the Doctoral Program of Higher Education under Grant No. 20120031120034.
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