Multipole plasmon resonances in gold nanorods.
The optical properties of gold rods electrochemically deposited in anodic aluminum oxide templates have been investigated. Homogeneous suspensions of rods with an average diameter of 85 nm and varying lengths of 96, 186, 321, 465, 495, 578, 641, 735, and 1175 nm were fabricated. The purity and dimensions of these rod nanostructures allowed us to observe higher-order multipole resonances for the first time in a colloidal suspension. The experimental optical spectra agree with discrete dipole approximation calculations that have been modeled from the dimensions of the gold nanorods.
Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
Emma Kathryn
EK
Payne
Kevin L
KL
Shuford
Sungho
S
Park
George C
GC
Schatz
Chad A
CA
Mirkin
D000537:Aluminum Oxide / Q000737:chemistry; D003102:Colloids / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods; D013499:Surface Properties; D013816:Thermodynamics
D003102:Colloids; D006046:Gold; D000537:Aluminum Oxide