Dynamics and two-photon absorption properties of chromophore functionalized semiconductor nanoparticles

Shankar Varaganti; Mathias Gessesse; Sherine O. Obare; Guda Ramakrishna

doi:10.1117/12.829276

20 August 2009 Dynamics and two-photon absorption properties of chromophore functionalized semiconductor nanoparticles

Shankar Varaganti, Mathias Gessesse, Sherine O. Obare, Guda Ramakrishna

Proceedings Volume 7413, Linear and Nonlinear Optics of Organic Materials IX; 741309 (2009) https://doi.org/10.1117/12.829276
Event: SPIE Photonic Devices + Applications, 2009, San Diego, California, United States

Abstract

Two photon absorption cross-sections and fluorescence dynamics of Riboflavin, Fluorescein 548, Coumarin 519 and Quinizarin adsorbed onto reactive (TiO₂) and non-reactive (ZrO₂) semiconductor nanoparticles have been investigated. These dye molecules are chosen because of their inherently different anchoring groups with which they can bind to semiconductor nanoparticles giving a handle to probe the influence of anchoring group as well as molecule-nanoparticle electronic coupling on the two-photon absorption and nonlinear optical properties. Two-photon excited fluorescence technique has been utilized to monitor the two photon absorption cross-sections and the dynamics of singlet states are followed with femto second fluorescence upconversion. Interesting cross-section trends have been observed where the TPA cross-section of chromophore on ZrO₂ surface is similar or lower to that of the free dye while the cross-sections seem to be higher on the surface of reactive TiO₂ nanoparticle surface. Fluorescence upconversion investigations were able to probe the electronic interactions of the chromophore with semiconductor nanoparticle and also the adsorption of the chromophores on the surface of the nanoparticle.

Citation Download Citation

Shankar Varaganti, Mathias Gessesse, Sherine O. Obare, and Guda Ramakrishna "Dynamics and two-photon absorption properties of chromophore functionalized semiconductor nanoparticles", Proc. SPIE 7413, Linear and Nonlinear Optics of Organic Materials IX, 741309 (20 August 2009); https://doi.org/10.1117/12.829276

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