Optical and Quantum Electronics

, Volume 38, Issue 1–3, pp 257–267 | Cite as

Effective Mode Volume of Nanoscale Plasmon Cavities

  • Stefan A. Maier


The controlled squeezing of electromagnetic energy into nanometric volumes via surface plasmon-polariton excitations in plasmonic nanoresonators is analyzed using the concept of an effective electromagnetic mode volume Veff, while taking careful account of the plasmon-polariton dispersion and the electromagnetic energy stored in the metal. Together with the quality factor Q of the cavity resonance, this enables a comparison with dielectric optical cavities, where Veff is limited by diffraction. For a Fabry–Perot type planar metallic cavity, a one-dimensional analytic model as well as a three-dimensional finite-difference time-domain simulation reveal that Veff is not bounded by diffraction, and that Q/Veff increases for decreasing cavity size. In this picture, matter–plasmon interactions can be quantified in terms of Q and Veff, and a resonant cavity model for the enhancement of spontaneous Raman scattering is presented.


nanophotonics surface plasmon polaritons 


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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.Centre for Photonics and Photonic Materials, Department of PhysicsUniversity of BathBathUK

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