Acoustically-controlled optical Kerr effect signals in bimetallic Au-Pt nanoparticles embedded in a TiO₂ thin film

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• 作者：A. Navarro^a ; ^b ; ^c ; J. Pava-Chipol^c ; C.L. Martí ; nez-Gonzá ; lez^c ; M. Trejo-Valdez^d ; L.H. Herná ; ndez-Gó ; mez^c ; C. Torres-Torres^c ; ^{ctorrest@ipn.mx} ; ^{crstorres@yahoo.com.mx}
• 关键词：Optical Kerr effect ; Interferometry ; Acousto-optics ; Bimetallic nanoparticles
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：24-31
• 全文大小：1703 K
• 卷排序：130

文摘

Nonlinear optical measurements for detecting acoustical waves were carried out in bimetallic Au-Pt nanoparticles embedded in a TiO2 thin solid film. The samples were prepared by a sol-gel method. A two-wave mixing technique was employed to explore the third order nonlinear optical properties exhibited by the nanocomposites. Interferometric measurements sensitive to acoustical perturbations were studied in the samples. The modification in the index of refraction of the nanocomposites induced by vectorial nanosecond optical irradiations was comparatively evaluated. Additionally, a single-beam transmittance experiment confirmed the absence of any important multi-photonic absorption process during our measurements. An optical Kerr effect was identified to be the main responsible effect for the third order optical nonlinearities induced by nanosecond pulses at 532 nm wavelength. It is considered that advantages in acousto-optical transduction by nonlinear optical interactions can give rise to potential development of quantum information acquisition systems and high-speed sensors. Moreover, low-dimensional acousto-optical functions in nanostructured materials can be contemplated.