Plasmonics

, Volume 6, Issue 1, pp 183–188

High Q Long-Range Surface Plasmon Polariton Modes in Sub-wavelength Metallic Microdisk Cavity

Article

Abstract

Metal-capped microdisk cavity supporting surface plasmon polaritons (SPP)-guided whispering gallery mode (WGM) can achieve higher cavity factor Q than traditional microdisk cavity in sub-wavelength dimensions. We have numerically analyzed the limiting factors on Q using finite difference time domain method. The Q of SPP-guided WGM is primarily limited by the loss of metal. A thin metal-sandwiched microdisk cavity supporting long-range surface plasmon polariton mode was proposed to reduce the metal loss. The proposed cavities have been shown to increase cavity Q by more than 15-fold and reduce threshold gain by more than threefold as opposed to traditional microdisk cavities.

Keywords

Nanolaser Surface plasmon mode Whispering gallery mode Semiconductor laser cavity 

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.EECS DepartmentUniversity of MichiganAnn ArborUSA

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