中国物理B ›› 2010, Vol. 19 ›› Issue (5): 54201-054201.doi: 10.1088/1674-1056/19/5/054201

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Numerical analysis of surface plasmon nanocavities formed inthickness-modulated metal－insulator－metal waveguides

张岩1, 刘建龙2, 赵海发2, 刘树田2, 林杰3   

  1. (1)Department of Physics, Capital Normal University, Beijing 100037, China; (2)Department of Physics, Harbin Institute of Technology, Harbin 150001, China; (3)School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2009-05-30 修回日期:2009-09-18 出版日期:2010-05-15 发布日期:2010-05-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.~10674038 and 10604042), and the National Basic Research Program of China (Grant No.~2006CB302901).

Numerical analysis of surface plasmon nanocavities formed in thickness-modulated metal－insulator－metal waveguides

Liu Jian-Long(刘建龙)a), Lin Jie(林杰)b), Zhao Hai-Fa(赵海发)a), Zhang Yan(张岩)c), and Liu Shu-Tian(刘树田) a)†   

  1. a Department of Physics, Harbin Institute of Technology, Harbin 150001, China; b School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China; c Department of Physics, Capital Normal University, Beijing 100037, China
  • Received:2009-05-30 Revised:2009-09-18 Online:2010-05-15 Published:2010-05-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.~10674038 and 10604042), and the National Basic Research Program of China (Grant No.~2006CB302901).

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摘要： The enhancement characteristics of the local field in the surface plasmon nanocavities are investigated numerically. The cavity is constructed by placing a defect structure in the thickness-modulated metal--insulator--metal waveguide Bragg gratings. The characteristic impedance based transfer matrix method is used to calculate the transmission spectra and the resonant wavelength of the cavities with various geometric parameters. The finite-difference time-domain method is used to obtain the field pattern of the resonant mode and validate the results of the transfer matrix method. The calculation and simulation results reveal the existence of resonant wavelength shift and intensity variation with structural parameters, such as the modulation period of the gratings, the length and the width of the defect structure. Both numerical analysis and theoretical interpretation on these phenomena are given in details.

Abstract: The enhancement characteristics of the local field in the surface plasmon nanocavities are investigated numerically. The cavity is constructed by placing a defect structure in the thickness-modulated metal--insulator--metal waveguide Bragg gratings. The characteristic impedance based transfer matrix method is used to calculate the transmission spectra and the resonant wavelength of the cavities with various geometric parameters. The finite-difference time-domain method is used to obtain the field pattern of the resonant mode and validate the results of the transfer matrix method. The calculation and simulation results reveal the existence of resonant wavelength shift and intensity variation with structural parameters, such as the modulation period of the gratings, the length and the width of the defect structure. Both numerical analysis and theoretical interpretation on these phenomena are given in details.

Key words: surface plasmon, nanocavity, local field enhancement

中图分类号:  (Waveguides, couplers, and arrays)

  • 42.82.Et
42.82.Bq (Design and performance testing of integrated-optical systems) 02.60.Dc (Numerical linear algebra) 02.70.Bf (Finite-difference methods)