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Multipole plasmon resonances of submicron silver particles
Amar S Kumbhar1, Mark K Kinnan, George Chumanov
1Department of Chemistry, Clemson University, Clemson, South Carolina 29364, USA.
Journal of the American Chemical Society
|September 8, 2005
Summary
Researchers synthesized silver nanoparticles and observed unique plasmon resonance modes, including dipole, quadrupole, and octupole. These findings advance understanding of nanoparticle optical properties and their environmental interactions.
Area of Science:
- Nanotechnology
- Materials Science
- Physical Chemistry
Background:
- Noble metal nanoparticles exhibit unique optical properties due to surface plasmon resonance.
- Understanding higher-order multipoles in plasmon resonance is crucial for advanced optical applications.
Purpose of the Study:
- To synthesize and characterize silver nanoparticles with specific sizes.
- To investigate the presence and evolution of higher-order multipoles in plasmon resonance.
- To analyze the influence of the surrounding dielectric medium on plasmon modes.
Main Methods:
- Synthesis of single crystal silver nanoparticles (215 nm) via hydrogen reduction.
- Characterization using UV-visible extinction spectroscopy and electron microscopy.
- Mie extinction calculations for spectral analysis.
Main Results:
- Extinction spectra confirmed the presence of dipole, quadrupole, octupole, and hexadecapole plasmon resonance modes.
- Continuous monitoring revealed the formation of higher-order multipoles during particle growth.
- Experimental spectra showed good agreement with Mie extinction calculations.
- Plasmon mode frequency shifts were correlated with the refractive index of the surrounding medium.
Conclusions:
- The study successfully synthesized silver nanoparticles exhibiting complex plasmonic behavior.
- Higher-order multipoles play a significant role in the optical response of these nanoparticles.
- The findings provide valuable insights into nanoparticle optics and their sensitivity to environmental changes.
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