中国物理B ›› 2009, Vol. 18 ›› Issue (8): 3535-3541.doi: 10.1088/1674-1056/18/8/066

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Long-range surface plasmon polaritons with subwavelength mode expansion in an asymmetrical system

陈建军, 李智, 龚旗煌   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2009-01-12 修回日期:2009-02-17 出版日期:2009-08-20 发布日期:2009-08-20
  • 基金资助:
    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).

Long-range surface plasmon polaritons with subwavelength mode expansion in an asymmetrical system

Chen Jian-Jun(陈建军), Li Zhi(李智)† , and Gong Qi-Huang(龚旗煌)‡   

  1. State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China
  • Received:2009-01-12 Revised:2009-02-17 Online:2009-08-20 Published:2009-08-20
  • Supported by:
    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).

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摘要： 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.

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.

Key words: surface plasmon polaritons, field intensity confinement, long propagation length, integrated optics

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
68.55.-a (Thin film structure and morphology) 71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions)) 77.22.Ch (Permittivity (dielectric function)) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))