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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper QPDP2

Long-range Surface Modes of Thin Films.

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Abstract

The p-polarised long-range surface mode supported by a thin film, of thickness d, of permittivity ϵ2(= ϵr2iϵi2) and bounded by two semi-infinite dielectric media of permittivities ϵ1 and ϵ3, have been systematically examined. In the symmetric case (ϵ1 = ϵ3) as well as the established long-range surface plasmon (LESP)1 and the TMo guided mode2 there are three new mode types. When ϵi2 is large there is still a long-range mode supported by the film irrespective of whether ϵr2 ≥ 03 or ϵr2 < 0. When |ϵr2|≪ ϵi2 the damping of the long-range mode is inversely proportional to ϵi2. More surprisingly when ϵi2 = 0 and ϵr2 < 0 with |ϵr2| < ϵ1 we also find a long-range surface mode, although neither interface independently supports a surface mode. When d < dmax, a maximum film thickness, we can even more surprisingly find two symmetric modes having different k values for a single d value. (see Figure 1, modes k1 and k2).

© 1990 Optical Society of America

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