期刊
JOURNAL OF APPLIED PHYSICS
卷 109, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3564935
关键词
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资金
- National Natural Science Foundation of China [10804004, 10821062, 90921008]
- National Basic Research Program of China [2007CB307001, 2009CB930504]
By coating a metal with a finite-thickness dielectric film, evident differences in the wave-vector magnitude between surface plasmon polaritons (SPPs) and quasicylindrical waves (quasi-CWs) emerge. This brings modulation patterns to the total field on the metal surface near the electromagnetic source. Based on such an effect, an ultracompact SPP splitter with a lateral dimension of only 800 nm is experimentally demonstrated at wavelengths of 740 nm and 832 nm in a dielectric-film-coated asymmetric single nanoslit. These results imply that the additional modulation of quasi-CWs to the total field provide new possibilities for the design of ultracompact plasmonic devices. (C) 2011 American Institute of Physics. [doi:10.1063/1.3564935]
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