Tuning the second harmonic generation of self-generated metallic islands
When crossing the percolation threshold the optical behavior of thin metal films dramatically change within a narrow range. Recording the optical properties in the vicinity of the percolation provides insight into the interplay of those contributions that determine the intensity of the second harmon...
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doaj-980e853167a844aca844ad90a6a9c3982020-11-24T22:47:18ZengAIP Publishing LLCAIP Advances2158-32262018-07-0187075012075012-710.1063/1.5027715054807ADVTuning the second harmonic generation of self-generated metallic islandsAnnika Konzelmann0Hemant Charaya1Bruno Gompf2Martin Dressel3Audrey Berrier4Physikalisches Institut and Research Center SCoPE, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyPhysikalisches Institut and Research Center SCoPE, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyPhysikalisches Institut and Research Center SCoPE, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyPhysikalisches Institut and Research Center SCoPE, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyPhysikalisches Institut and Research Center SCoPE, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, GermanyWhen crossing the percolation threshold the optical behavior of thin metal films dramatically change within a narrow range. Recording the optical properties in the vicinity of the percolation provides insight into the interplay of those contributions that determine the intensity of the second harmonic signal: the metallic islands and the dielectric gap between the islands. Here we demonstrate the active tuning of the linear and nonlinear optical properties of a thin gold film on a stretchable PDMS substrate. Ellipsometry was combined with nonlinear studies (second-harmonic generation) to describe the optical properties of thin gold films around the percolation. We monitor the metal-insulator transition, characterize the evolution of the permittivity of the layer, and explain the strength variations of the second harmonic generation with respect to the spectral difference between fundamental wavelength and plasmonic resonance, as well as the enhancement of the field in the dielectric gaps as a function of the particle-particle distance. A model reproduces the experimental observations by taking into account both effects at the fundamental and at the generated wavelengths.http://dx.doi.org/10.1063/1.5027715 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Annika Konzelmann Hemant Charaya Bruno Gompf Martin Dressel Audrey Berrier |
spellingShingle |
Annika Konzelmann Hemant Charaya Bruno Gompf Martin Dressel Audrey Berrier Tuning the second harmonic generation of self-generated metallic islands AIP Advances |
author_facet |
Annika Konzelmann Hemant Charaya Bruno Gompf Martin Dressel Audrey Berrier |
author_sort |
Annika Konzelmann |
title |
Tuning the second harmonic generation of self-generated metallic islands |
title_short |
Tuning the second harmonic generation of self-generated metallic islands |
title_full |
Tuning the second harmonic generation of self-generated metallic islands |
title_fullStr |
Tuning the second harmonic generation of self-generated metallic islands |
title_full_unstemmed |
Tuning the second harmonic generation of self-generated metallic islands |
title_sort |
tuning the second harmonic generation of self-generated metallic islands |
publisher |
AIP Publishing LLC |
series |
AIP Advances |
issn |
2158-3226 |
publishDate |
2018-07-01 |
description |
When crossing the percolation threshold the optical behavior of thin metal films dramatically change within a narrow range. Recording the optical properties in the vicinity of the percolation provides insight into the interplay of those contributions that determine the intensity of the second harmonic signal: the metallic islands and the dielectric gap between the islands. Here we demonstrate the active tuning of the linear and nonlinear optical properties of a thin gold film on a stretchable PDMS substrate. Ellipsometry was combined with nonlinear studies (second-harmonic generation) to describe the optical properties of thin gold films around the percolation. We monitor the metal-insulator transition, characterize the evolution of the permittivity of the layer, and explain the strength variations of the second harmonic generation with respect to the spectral difference between fundamental wavelength and plasmonic resonance, as well as the enhancement of the field in the dielectric gaps as a function of the particle-particle distance. A model reproduces the experimental observations by taking into account both effects at the fundamental and at the generated wavelengths. |
url |
http://dx.doi.org/10.1063/1.5027715 |
work_keys_str_mv |
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