Enhancement of the surface plasmon-polariton excitation in nanometer metal films

Vladimir A. Kukushkin , Nikoly V. Baidus

Abstract

This study is aimed to the numerical modeling of the surface plasmon-polariton excitation by a layer of active (electrically pumped) quantum dots embedded in a semiconductor, covered with a metal. It is shown that this excitation becomes much more efficient if the metal has a form of a thin (with thickness of several nanometers) film. The cause of this enhancement in comparison with a thick covering metal film is the partial surface plasmon-polariton localized at the metal-semiconductor interface penetration into air. In result the real part of the metal+air half-space effective dielectric function becomes closer (in absolute value) to the real part of the semiconductor dielectric function than in the case of a thick covering metal film. This leads to approaching the point of the surface plasmon-polariton resonance (where absolute values of these parts coincide) and, therefore, the enhancement of the surface plasmon-polariton excitation. The calculations were made for a particular example of InAs quantum dot layer embedded in GaAs matrix covered with an Au film. Its results indicate that for the 10 nm Au film the rate of this excitation becomes by 2.5 times, and for the 5 nm Au film – by 6-7 times larger than in the case of a thick (40 nm or more) Au film.

Key Words

surface plasmon-polaritons; nanometer metal films; quantum dots

Address

Vladimir A. Kukushkin — Department of Plasma Physics and High-Power Electronics, Institute of Applied Physics of the Russian Academy of Science, 46 Ulyanov st., 603950 Nizhny Novgorod, Russia; Nizhny Novgorod State University named after N.I. Lobachevsky, 23 Gagarina pr., 603950 Nizhny Novgorod, Russia
Nikoly V. Baidus — Nizhny Novgorod State University named after N.I. Lobachevsky, 23 Gagarina pr., 603950 Nizhny Novgorod, Russia; 3Research Physico-Technical Institute of the Nizhny Novgorod State University named after N.I. Lobachevsky, 23 Gagarina pr., 603950 Nizhny Novgorod, Russia

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