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Revealing the three-dimensional orientation and interplay between plasmons and interband transitions for single gold bipyramids by photoluminescence excitation pattern imaging

  • Gold bipyramids (AuBPs) attract significant attention due to the large enhancement of the electric field around their sharp tips and well-defined tunability of their plasmon resonances. Excitation patterns of single AuBPs are recorded using raster-scanning confocal microscopy combined with radially and azimuthally polarized laser beams. Photoluminescence spectra (PL) and excitation patterns of the same AuBPs are acquired with three different excitation wavelengths. The isotropic excitation patterns suggest that the AuBPs are mainly excited by interband transitions with 488/530 nm radiation, while excitation patterns created with a 633 nm laser exhibit a double-lobed shape that indicates a single-dipole excitation process associated with the longitudinal plasmon resonance mode. We are able to determine the three-dimensional orientation of single AuBPs nonperturbatively by comparing experimental patterns with theoretical simulations. The asymmetric patterns show that the AuBPs are lying on the substrate with an out-of-plane tilt angle of around 10–15°.

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Metadaten
Author of HS ReutlingenBrecht, Marc; Wackenhut, Frank
DOI:https://doi.org/10.1021/acs.jpcc.1c08402
ISSN:1932-7447
eISSN:1932-7455
Erschienen in:The journal of physical chemistry. C, Nanomaterials and interfaces
Publisher:American Chemical Society
Place of publication:Washington D.C.
Document Type:Journal article
Language:English
Publication year:2021
Volume:125
Issue:48
Page Number:8
First Page:26978
Last Page:26985
PPN:Im Katalog der Hochschule Reutlingen ansehen
DDC classes:540 Chemie
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt