TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Liu, Quan
A1  - Ge, Dandan
A1  - Wackenhut, Frank
A1  - Coplin, Caitlin
A1  - Cherqui, Charles
A1  - Brecht, Marc
A1  - Lin, Xiao-Min
A1  - Schatz, George
A1  - Schaller, Richard
A1  - Adam, Pierre-Michel
A1  - Bachelot, Renaud
A1  - Meixner, Alfred
T1  - Revealing the three-dimensional orientation and interplay between plasmons and interband transitions for single gold bipyramids by photoluminescence excitation pattern imaging
JF  - The journal of physical chemistry. C, Nanomaterials and interfaces
N2  - 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°.
Y1  - 2021
SN  - 1932-7447
SS  - 1932-7447
U6  - https://doi.org/10.1021/acs.jpcc.1c08402
DO  - https://doi.org/10.1021/acs.jpcc.1c08402
VL  - 125
IS  - 48
SP  - 26978
EP  - 26985
S1  - 8
PB  - American Chemical Society
CY  - Washington D.C.
ER  -