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National Science Foundation Designing glass structures for fs-laser processing Denise M. Krol, University of California-Davis, DMR 1206979 Schematic diagram of fs-laser structuring in glass Overview Focused femtosecond (fs) lasers can alter the structure of transparent materials, such as glass, with sub-micron resolution and high spatial precision. This technique offers a unique manufacturing tool for the fabrication of complex three-dimensional structures embedded inside glass, as opposed to conventional patterning and lithography techniques which are typically restricted to surface layers. Fs-laser structured glass has applications in photonic as well as lab- on-chip device technology. The objective of this project is to develop a fundamental understanding of the materials parameters that govern the response of glass to fs-laser irradiation. This research is a collaboration between groups with expertise in optical materials and laser physics (UC-Davis) and glass chemistry (Missouri S&T).

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National Science Foundation Modeling the fs-laser matter interaction Denise M. Krol, University of California-Davis, DMR 1206979 Scientific highlight We have developed a numerical model based on the Finite Difference Time Domain (FDTD) method to describe the physical processes during fs-laser structuring. In this model, we incorporate the generation of a plasma by the laser pulse and the interaction between the pulse and this induced plasma. By taking the time-and-space- dependent Drude response of the laser- induced plasma into account, the model excellently describes the behavior of the self-reflectivity under fs nano-ablation conditions. This work was carried out in collaboration with physicists Hao Zhang, Dries van Oosten and Jaap Dijkhuis from Utrecht University, the Netherlands. 2D-FDTD calculations and experimental measurements of self-reflectivity on two silicon- insulator-samples, SOI1 (red) and SOI2 (green), as a function of laser pulse fluence. Circles and squares indicate the data of two independent experimental runs. Thick solid lines show the reflectivity calculated by 2D-FDTD simulations with the TM and TE modes combined. Thin solid lines show the reflectivity of the TM and TE modes separately. Dashed lines show the self-reflectivity obtained by 1D-FDTD calculations.

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National Science Foundation George W. Morey Award Denise M. Krol, University of California-Davis, DMR 1206979 PI Denise Krol has received the 2013 George W. Morey Award from the Glass and Optical Materials Division (GOMD) of the American Ceramic Society. The award recognizes original research in the field of glass science and technology as evidenced by excellence in either experimental or theoretical research done by the recipient. Prof. Krol presents her Morey Award Lecture Focus> and Flash! Changing the structure of glass with light in San Diego, CA on June 4, 2013. GOMD chair Prof. Kelly Simmons Potter presents the award at the GOMD annual meeting, held this year as part of the 10th Pacific Rim Conference on Ceramic and Glass Technology in San Diego, CA from June 2-7, 2013.