Nonlinear effects in propagation of long-range surface plasmon polaritons in gold strip waveguides

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Abstract

This paper is devoted to experimental and theoretical studies of nonlinear propagation of a long-range surface plasmon polariton (LRSPP) in gold strip waveguides. The plasmonic waveguides are fabricated in house, and contain a gold layer, tantalum pentoxide adhesion layers, and silicon dioxide cladding. The optical characterization was performed using a high power picosecond laser at 1064 nm. The experiments reveal two nonlinear optical effects: nonlinear power transmission and spectral broadening of the LRSPP mode in the waveguides. Both nonlinear optical effects depend on the gold layer thickness. The theoretical model of these effects is based on the third-order susceptibility of the constituent materials. The linear and nonlinear parameters of the LRSPP mode are obtained, and the nonlinear Schrodinger equation is solved. The dispersion length is much larger than the waveguides length, and the chromatic dispersion does not affect the propagation of the plasmonic mode. We find that the third-order susceptibility of the gold layer has a dominant contribution to the effective third-order susceptibility of the LRSPP mode. The real part of the effective third-order susceptibility leads to the observed spectral broadening through the self-phase modulation effect, and its imaginary part determines the nonlinear absorption parameter and leads to the observed nonlinear power transmission. The experimental values of the third-order susceptibility of the gold layers ale obtained. They indicate an effective enhancement of the third order susceptibility for the gold layers, comparing to the bulk gold values. This enhancement is explained in terms of the change of the electrons motion.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages12
Volume9884
PublisherSPIE - International Society for Optical Engineering
Publication date2016
Article number988420
ISBN (Print)9781510601291
DOIs
Publication statusPublished - 2016
EventNanophotonics VI - Brussels, Belgium
Duration: 3 Apr 20167 Apr 2016

Conference

ConferenceNanophotonics VI
CountryBelgium
CityBrussels
Period03/04/201607/04/2016
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume9884
ISSN0277-786X

Bibliographical note

Copyright 2017 Society of Photo Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, or modification of the contents of the publication are prohibited.

Cite this

Lysenko, O., Bache, M., Malureanu, R., & Lavrinenko, A. (2016). Nonlinear effects in propagation of long-range surface plasmon polaritons in gold strip waveguides. In Proceedings of SPIE (Vol. 9884). [988420] SPIE - International Society for Optical Engineering. Proceedings of SPIE, the International Society for Optical Engineering, Vol.. 9884 https://doi.org/10.1117/12.2224500