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Micro-Refractometry and Local-Field Mapping with Single Molecules

Titelangaben

Naumov, Andrei V. ; Gorshelev, A. A. ; Gladush, M. G. ; Anikushina, T. A. ; Golovanova, A. V. ; Köhler, Jürgen ; Kador, Lothar:
Micro-Refractometry and Local-Field Mapping with Single Molecules.
In: Nano Letters. (2018) .
ISSN 1530-6992
DOI: https://doi.org/10.1021/acs.nanolett.8b01753

Abstract

The refractive index n is one of the most important materials parameters of solids and, in recent years, has become the subject of significant interdisciplinary interest, especially in nanostructures and meta-materials. It is, in principle, a macroscopic quantity, so its meaning on a length scale of a few nanometers, i.e., well below the wavelength of light, is not clear a priori and is related to methods of its measurement on this length scale. Here we introduce a novel experimental approach for mapping the effective local value Formula: see text of the refractive index in solid films and the analysis of related local-field enhancement effects. The approach is based on the imaging and spectroscopy of single chromophore molecules at cryogenic temperatures. Since the fluorescence lifetime T1 of dye molecules in a transparent matrix depends on the refractive index due to the local density of the electromagnetic field (i.e., of the photon states), one can obtain the local Formula: see text values in the surroundings of individual chromophores simply by measuring their T1 times. Spatial mapping of the local Formula: see text values is accomplished by localizing the corresponding chromophores with~nanometer accuracy. We demonstrate this approach for a polycrystalline n-hexadecane film doped with terrylene. Unexpectedly large fluctuations of local-field effects and effective Formula: see text values (the latter between 1.1 and 1.9) were found.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie - Univ.-Prof. Dr. Jürgen Köhler
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 IX - Spektroskopie weicher Materie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 14 Sep 2018 06:19
Letzte Änderung: 04 Okt 2018 10:56
URI: https://eref.uni-bayreuth.de/id/eprint/45772