Unusual extinction spectra of nanometer-sized silver particles arranged in two-dimensional arrays
- Ames Lab., IA (United States)
Two-dimensional arrays of 1000 A silver particles were prepared by adsorption from colloidal suspensions onto glass slides derivatized with (3-mercaptopropyl)trimethoxysilane. By variation of the concentration of the colloidal suspensions, slides with different interparticle distances were obtained, and their extinction spectra were measured in water. A blue shift (up to 90 nm) and sharpening of the peak corresponding to the plasmon resonance was observed as the distance between particles decreased to a value comparable to, or less than, their diameter. The angular dependence of the extinction spectra was studied for s- and p-polarized light. The data are interpreted to result from coherent coupling of the plasmon resonances in closely spaced silver particles upon irradiation with light. 19 refs., 3 figs.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 226695
- Journal Information:
- Journal of Physical Chemistry, Vol. 100, Issue 13; Other Information: PBD: 28 Mar 1996
- Country of Publication:
- United States
- Language:
- English
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