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Proceedings Paper

Plasmon-exciton transition in iodized Ag-Cu nanostructured films
Author(s): M. Gnanavel; C. S. Sunandana
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Paper Abstract

Ag1-xCuxI (x= 0.10, 0.20, and 0.50) thin films with thicknesses upto15 nm produced by thermal co-evaporation onto glass substrates were systematically iodized and carefully characterized. Optical absorption spectra of uniodized Ag-Cu films show intense surface plasmon resonance (SPR) features with maxima at 430, 445 and 445 nm for the films of thickness 5, 10 and 15 nm respectively and a gradual transition to zincblende AgI exciton with optical signatures at 425 nm. Delayed evolution and inhomogeneous broadening of the exciton absorption at 425 nm of the spatially confined γ- AgI nanoparticles were clearly seen by the development of Z1,2 and Z3 exciton peaks iodization kinetics being controlled by the as-quenched Ag-Cu clusters. Cu addition not only restricts the particle size, but also favors the island type growth mode. PL observed at 428 nm shows a thickness and Cu-composition dependent intensity suggesting the involvement of Frenkel defects in non-radiative recombination.

Paper Details

Date Published: 2 September 2009
PDF: 8 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73942D (2 September 2009); doi: 10.1117/12.825453
Show Author Affiliations
M. Gnanavel, Univ. of Hyderabad (India)
C. S. Sunandana, Univ. of Hyderabad (India)

Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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