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Nonlinear optics of complex plasmonic structures : linear and third-order optical response of orthogonally coupled metallic nanoantennas

Titelangaben

Metzger, Bernd ; Hentschel, Mario ; Nesterov, Maxim ; Schumacher, Thorsten ; Lippitz, Markus ; Giessen, Harald:
Nonlinear optics of complex plasmonic structures : linear and third-order optical response of orthogonally coupled metallic nanoantennas.
In: Applied Physics B. Bd. 122 (April 2016) Heft 4 . - No. 77.
ISSN 1432-0649
DOI: https://doi.org/10.1007/s00340-016-6348-5

Abstract

We investigate the polarization-resolved linear and third-order optical response of plasmonic nanostructure arrays that consist of orthogonally coupled gold nanoantennas. By rotating the incident light polarization direction, either one of the two eigenmodes of the coupled system or a superposition of the eigenmodes can be excited. We find that when an eigenmode is driven by the external light field, the generated third-harmonic signals exhibit the same polarization direction as the fundamental field. In contrast, when a superposition of the two eigenmodes is excited, third-harmonic can efficiently be radiated at the perpendicular polarization direction. Furthermore, the interference of the coherent third-harmonic signals radiated from both nanorods proves that the phase between the two plasmonic oscillators changes in the third-harmonic signal over 3 pi when the laser is spectrally tuned over the resonance, rather than over pi as in the case of the fundamental field. Finally, almost all details of the linear and the nonlinear spectra can be described by an anharmonic coupled oscillator model, which we discuss in detail and which provides deep insight into the linear and the nonlinear optical response of coupled plasmonic nanoantennas.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik III - Nanooptik > Lehrstuhl Experimentalphysik III - Nanooptik - Univ.-Prof. Dr. Markus Lippitz
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik III - Nanooptik
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 19 Mai 2016 09:06
Letzte Änderung: 04 Aug 2017 05:41
URI: https://eref.uni-bayreuth.de/id/eprint/32409