Plasmon-exciton transition in iodized Ag-Cu nanostructured films

M. Gnanavel; C. S. Sunandana

doi:10.1117/12.825453

2 September 2009 Plasmon-exciton transition in iodized Ag-Cu nanostructured films

M. Gnanavel, C. S. Sunandana

Proceedings Volume 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII; 73942D (2009) https://doi.org/10.1117/12.825453
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

Ag_1-xCu_xI (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 Z_1,2 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.

Citation Download Citation

M. Gnanavel and C. S. Sunandana "Plasmon-exciton transition in iodized Ag-Cu nanostructured films", Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73942D (2 September 2009); https://doi.org/10.1117/12.825453

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KEYWORDS

Copper

Excitons

Silver

Absorption

Thin films

Particles

Crystals

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