Thermal optical nonlinearity enhanced by gold nanoparticles

Rogério F. Souza; Márcio A. R. C. Alencar; César M. Nascimento; Monique G. A. da Silva; Mario R. Meneghetti; Jandir M. Hickmann

doi:10.1117/12.680072

11 September 2006 Thermal optical nonlinearity enhanced by gold nanoparticles

Rogério F. Souza, Márcio A. R. C. Alencar, César M. Nascimento, Monique G. A. da Silva, Mario R. Meneghetti, Jandir M. Hickmann

Author Affiliations +

Proceedings Volume 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV; 63231T (2006) https://doi.org/10.1117/12.680072
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

We report on the observation of a large thermal nonlinearity of an organic material enhanced by the presence of gold nanoparticles. The studied system consisted of a colloid of castor oil and gold particles with average diameter of 10 nm, with filling factor of 4.0x10^-5. Z-scan measurements were performed for an excitation wavelength tuned at 810 nm in the CW regime. It was observed that this colloidal system presents a large thermal nonlinear refractive index, which was equal to -7.4x10^-8 cm²/W. This value is about 41 times larger than the n₂ of the host material. The thermo-optic coefficient of the colloid was also evaluated, and a large enhancement was observed in its value owing to the presence of the gold nanoparticles in the organic material.

Citation Download Citation

Rogério F. Souza, Márcio A. R. C. Alencar, César M. Nascimento, Monique G. A. da Silva, Mario R. Meneghetti, and Jandir M. Hickmann "Thermal optical nonlinearity enhanced by gold nanoparticles", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 63231T (11 September 2006); https://doi.org/10.1117/12.680072

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