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Surface plasmons at nanoscale relief gratings between a metal and a dielectric medium with optical gain
 

Summary: Surface plasmons at nanoscale relief gratings between a metal and a dielectric medium
with optical gain
Ivan Avrutsky
Department of Electrical and Computer Engineering, Wayne State University, Detroit, Michigan 48202, USA
(Received 13 May 2004; revised manuscript received 23 July 2004; published 27 October 2004)
Surface plasmons at the interface between metal and a dielectric with strong optical amplification are
analyzed theoretically. It is shown that proper choice of optical indices of the dielectric medium results in an
infinitely large effective refractive index of surface waves. Such resonant plasmons have extremely low group
velocity and are localized within a vanishingly small distance near the interface. The plasmon-related anoma-
lies in the UV reflection spectra are predicted for nanoscale gratings on a surface of a silver film covered by a
concentrated dye solution with high optical amplification.
DOI: 10.1103/PhysRevB.70.155416 PACS number(s): 78.67.-n, 42.25.Bs, 42.25.Fx, 76.68. m
Surface plasmons and polaritons are electromagnetic os-
cillation localized at the interface between materials with
positive and negative dielectric permittivities. When the
negative permittivity results from the plasma effect of free
electrons in metals, such surface oscillations are called plas-
mons. In polar dielectrics, the permittivity becomes negative
in a relatively narrow spectral range in the middle infrared
between the frequencies of transverse and longitudinal opti-

  

Source: Avrutsky, Ivan - Department of Electrical and Computer Engineering, Wayne State University

 

Collections: Engineering