Abstract Long-range surface plasmon polariton (LRSPP) modes in an asymmetrical system, in which the thin metal film is sandwiched between a semi-infinite substrate and a high permittivity polymer film with a finite thickness, are theoretically calculated and analyzed. Due to the high permittivity of the polymer film, at proper polymer film thicknesses, the index-matching condition of the dielectrics at both sides of the metal can be satisfied for supporting LRSPP modes, and the electromagnetic field above the metal can be localized well. It is found that these LRSPP modes have both long propagation lengths and subwavelength mode expansion above the metal at the optimal polymer film thicknesses. Furthermore, the requirements on the refractive index and the thickness of the polymer film to support LRSPP modes at the optimal thicknesses are found to be not critical.
Received: 12 January 2009
Revised: 17 February 2009
Accepted manuscript online:
PACS:
73.20.Mf
(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10434020, 10821062
and 10804004), the State Key Development Program for Basic Research
of China (Grant Nos 2007CB307001 and 2009CB930504) and the Research
Fund for the Doctoral Program of Higher Education of China (Grant No
200800011023).
Cite this article:
Chen Jian-Jun(陈建军), Li Zhi(李智), and Gong Qi-Huang(龚旗煌) Long-range surface plasmon polaritons with subwavelength mode expansion in an asymmetrical system 2009 Chin. Phys. B 18 3535
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