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Multipole plasmon resonances in gold nanorods
Emma Kathryn Payne1, Kevin L Shuford, Sungho Park
1Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
The Journal of Physical Chemistry. B
|February 14, 2006
Summary
Researchers studied gold nanorods synthesized using anodic aluminum oxide templates. These nanostructures exhibited unique optical properties, enabling the observation of higher-order multipole resonances in colloidal suspensions.
Area of Science:
- Nanotechnology
- Materials Science
- Plasmonics
Background:
- Electrochemical deposition is a key technique for fabricating nanostructures.
- Anodic aluminum oxide templates offer precise control over nanorod dimensions.
- Understanding the optical properties of gold nanorods is crucial for applications in optics and electronics.
Purpose of the Study:
- To investigate the optical properties of gold nanorods.
- To explore higher-order multipole resonances in colloidal gold nanorod suspensions.
- To correlate experimental optical spectra with theoretical calculations.
Main Methods:
- Electrochemical deposition of gold nanorods within anodic aluminum oxide templates.
- Fabrication of homogeneous suspensions of gold nanorods with controlled dimensions.
- Optical spectroscopy to measure extinction spectra.
- Discrete dipole approximation (DDA) calculations for theoretical modeling.
Main Results:
- Successfully synthesized gold nanorods with an average diameter of 85 nm and lengths ranging from 96 to 1175 nm.
- Observed higher-order multipole resonances in colloidal suspensions of gold nanorods.
- Experimental optical spectra showed excellent agreement with DDA calculations based on nanorod dimensions.
Conclusions:
- The purity and controlled dimensions of the synthesized gold nanorods facilitated the observation of novel optical phenomena.
- Electrochemical deposition in AAO templates is an effective method for producing nanostructures with tunable optical properties.
- The study validates the use of DDA calculations for predicting the optical behavior of gold nanorods.
