Surface plasmon amplification without inversion in plasmonic nanogaps

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The theory of surface plasmon polariton (SPP) amplification in the metal-insulator-metal structure is developed from first principles. Basing on the dyadic Greena's function of the structure, an exact analytical expression for the gain coefficient is derived. It is shown that the amplification can occur without a population inversion and can reach giant (10 6 cm 1) values. The physical origin of this effect is associated with a positive feedback provided by the reflecting waveguide walls that does not require an external pumping. It is also predicted that the same physical phenomenon can lead to SPP generation and the corresponding threshold condition is obtained. It is stressed that such an effect does not imply stimulated emission in the structure and is principally different from SPASER.

Original languageEnglish
Title of host publicationNanophotonics V
EditorsDavid L. Andrews, Jean-Michel Nunzi, Andreas Ostendorf
Number of pages9
PublisherSPIE - International Society for Optical Engineering
Publication date2. May 2014
Article number9126 0W
ISBN (Print)9781628410747
Publication statusPublished - 2. May 2014
EventSPIE Photonics Europe 2014 - Brussels, Belgium
Duration: 14. Apr 201417. Apr 2014


ConferenceSPIE Photonics Europe 2014
SeriesProceedings of SPIE, the International Society for Optical Engineering


  • Amplification without inversion
  • Gap surface plasmon polaritons
  • Metal-insulator-metal waveguide
  • Plasmonics
  • Surface plasmon polariton amplification
  • Surface plasmon polariton generation
  • Surface plasmon polaritons


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