Photoinduced Ag-nanoparticle deposition on Fe-doped lithium niobate crystals

• DOI: 10.1364/ome.4.000359
• Publication Date: 2014-01-28T16:07:54Z
• Authors: Fangfang Jia; Wenbo Yan; Donghui Wang; Lixia Zhang; Lihong Shi; Aidiao Lin; Guohong Liang; Min Li; Yuwei Zhang; Jiushuang Zhang; Haiyun Dong; Guifeng Chen; Hongjian Chen
• Keywords: 02 engineering and technology; 0210 nano-technology

We study the photoinduced deposition of Ag nanoparticles on Fe-doped LiNbO3 crystals by using an in situ probe. SEM and XPS analysis show that Ag metallic nanoparticles are close-packedly deposited on the crystal surface. Both 405 and 532nm laser are found effective for the photo-induced Ag deposition. The Ag deposition on the y-surface shows obvious anisotropy as compared to that on the + z-surface. Moreover, the Ag deposition on the + z-surface is found to start easily surrounding the focal point of the laser rather than at its center. Both photogalvanic and diffusion effects of photo-excited electrons are suggested to account for these features.