Surface-plasmon radiation from ellipsoidal silver spheroids

Journal Article · Wed Feb 15 04:00:00 EST 1984 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.29.1606· OSTI ID:6617045

Little, J W; Callcott, T A; Ferrell, T L; Arakawa, E T

We have studied the radiation resulting from 15-keV-electron bombardment of thin silver films and of particles formed by heat treating these films. The particles were treated as oblate and prolate spheroids on which resonant surface-charge-density oscillations (surface plasmons) were excited by electron bombardment. We have calculated the energy associated with various surface-plasmon modes as a function of the shape of the spheroid using nonretarded electrodynamics and the optical properties of bulk silver. We have obtained good agreement between the calculations and the experimental observations of the wavelength, polarization, and angular intensity distributions of radiation emitted by silver particles which were characterized as to size and shape with the use of scanning electron microscopy. The emission from one type of sample was found to be the result of the radiative decay of a dipole and a quadrupole oscillation on oblate spheroids. The radiation from another type of sample showed evidence of the decay of dipole plasmons on prolate particles.

• Research Organization: Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 and University of Tennessee, Knoxville, Tennessee 37916
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6617045
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 29:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
COLLISIONS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON MICROSCOPY
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FILMS
INFORMATION
KEV RANGE
KEV RANGE 10-100
METALS
MICROSCOPY
NUMERICAL DATA
OPTICAL PROPERTIES
PARTICLES
PHOTOMULTIPLIERS
PHOTOTUBES
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
PLASMONS
POLARIZATION
QUASI PARTICLES
RADIATION EFFECTS
RADIATIONS
SCANNING ELECTRON MICROSCOPY
SILVER
SPHEROIDS
SURFACES
THEORETICAL DATA
THIN FILMS
TRANSITION ELEMENTS