Synthesis and linear optical properties of nanoscopic gold particle pair structures

Journal of Physical Chemistry B

Volumn 103, Issue 51, 1999, Pages 11398-11406

  Sandrock, Marie L ^a   Foss Jr , Colby A ^a  

^a GEORGETOWN UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000515774     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp992176x     Document Type: Article

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32. In the computation of extinction spectra using the DDSCAT program, the selection of an insufficient number of polarizable elements results in spectral oscillations on the long wavelength side of the plasmon resonance maximum. For each of the spectra in Figure 8, the number of polarizable elements was increased until the oscillations disappeared. We find that the number of polarizable elements required to prevent such oscillations increases as the interparticle spacing decreases.
33. In the study reported in ref 15, porous aluminum oxide films containing Au rods were impregnated with polyethylene and then exposed to base to dissolve all of the alumina. The Au rods were then mechanically oriented in the plane of the polyethylene film surface. Normal incidence plasmon resonance spectra were obtained at various polarization angles relative to the direction of rod orientation. Significantly, under conditions of parallel polarization, the spectra of the Au rod systems indicated long wavelength resonance bands arising from the particles' long axes. Short wavelength resonances were either absent or present only at very low intensity (consistent with either imperfect orientation of the rod-like particles, or a very small number of spherical Au impurity particles).