18 August 2010 Optical trapping/modification of nano-(micro)particles by gradient and photorefractive forces during laser illumination
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Abstract
In this paper we describe photo-induced trapping/redistribution of silver nano-(micro) particles near the surface of photorefractive crystal LiNbO3:Fe. This type of optical trapping is due to combined forces of direct gradient-force trapping and asymmetric photorefractive forces of electro-phoresis and dielectro-phoresis. The silver nanoparticles were produced through extracellular biosynthesis on exposure to the fungus, Fusarium oxysporum (FO) and to the plant extracts. Pulsed and CW visible laser radiation lead to significant modification of nanoparticle clusters. This study indicates that extracellular biosynthesis can constitute a possible viable alternative method for the production of nanoparticles. In addition, the theoretical modeling of asymmetric photorefractive electric field grating has been presented and compared with the experimental results.
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N. Kukhtarev, N. Kukhtarev, T. Kukhtareva, T. Kukhtareva, F. Okafor, F. Okafor, "Optical trapping/modification of nano-(micro)particles by gradient and photorefractive forces during laser illumination", Proc. SPIE 7781, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IV, 778110 (18 August 2010); doi: 10.1117/12.860429; https://doi.org/10.1117/12.860429
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