National Science Foundation Designing glass structures for fs-laser processing Denise M. Krol,...
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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
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).
Slide 2
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.
Slide 3
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.