Electromagnetic Wave Interactions with Metallic Microparticles: Experiments with Fibers and Flakes.
Abstract
Metallic microstructures affect the surface electromagnetic intensity and the charge transfer between the metal and molecular adsorbates. Surface enhanced Raman scattering research has been conducted to further understand these two basic enhancement mechanisms on electrodes, colloids, powder, and S-1 photocathodes. Dielectric microstrucures also affect the electromagnetic intensity, particularly inside the medium. In the case of optical fibers and liquid droplets, distinct morphology-dependent resonances can occur at specific ratios of the circumference to wavelength (size parameters). At these resonances, a dielectric microstructure can be conceptualized as an optical cavity. Both linear and nonlinear laser scattering phenomena have been investigated when the monochromatic incident radiation and/or the broadband internally generated inelastic radiation are commensurate with these morphology dependent resonances. Laser emission and stimulated Raman scattering from individual micron-size droplets have been observed for the first time. Originator supplied keywords include: Surface enhanced Raman scattering; Electromagnetic enhancement; Charge-transfer enhancement; Electrochemical oxidation and reduction; Morphology-dependent resonances; Localized surface plasmons; Atomic scale roughness; S-1 photocathodes; Laser droplets; Colloids; Powder. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1985
- Accession Number
- ADA158468
Entities
People
- R. K. Chang
Organizations
- Yale University