Multipole Plasmon Resonances of Submicron Silver Particles

Single crystal, silver particles of 215 ± 10 nm size were synthesized in solution using the hydrogen reduction method and were characterized by UV−visible extinction spectroscopy and electron microscopy. The extinction spectra reveal the presence of higher order multipoles of the plasmon resonance,...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2005-09, Vol.127 (36), p.12444-12445
Main Authors: Kumbhar, Amar S, Kinnan, Mark K, Chumanov, George
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Collective excitations (including plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Microspheres
Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Particle Size
Physics
Sensitivity and Specificity
Silver - chemistry
Surface and interface electron states
Surface Plasmon Resonance - methods
Surface Properties
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Description
Summary:Single crystal, silver particles of 215 ± 10 nm size were synthesized in solution using the hydrogen reduction method and were characterized by UV−visible extinction spectroscopy and electron microscopy. The extinction spectra reveal the presence of higher order multipoles of the plasmon resonance, such as quadrupole, octupole, and hexadecapole, in addition to the dipole. The formation of higher order multipoles was continuously monitored during the particles growth. Mie extinction calculations were performed and are in good agreement with the measured extinction spectra. The frequency shift of all plasmon modes was measured as a function of the refractive index of the surrounding dielectric medium.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja053242d