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Nanostructure Induced by Femtosecond Laser in Various OH-Contents Silicas

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Abstract:

Synthetic fused silicas with different OH content were irradiated with an ultrashort pulse laser, and the induced nanostructures were investigated. Compared with the samples before laser irradiation, two absorption bands centered at 4.8 eV corresponding to the E′(αSi•) center and at 5.8 eV corresponding to the non-bridging oxygen hole center (NBOHC, αSi—O•), were observed after laser irradiation in high-OH silicas. A photoluminescence band with photon energy of 1.9 eV was observed in the irradiated silicas under 4.8 eV light excitation. Though no red photoluminescence was observed after irradiating the inside of the low OH-containing silica samples, a similar phenomenon occurred when the laser beam was focused near the surface of low-OH silicas. The induced structures relaxed after annealing at 400 °C. A possible model for the generation of 1.9 eV photoluminescence induced by an ultrashort pulse laser in wet and dry silicas was proposed.

Keywords: DEFECT; FUSED SILICA; LASER IRRADIATION; NANOSTRUCTURE; PHOTOLUMINESCENCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.357

Publication date: March 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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