When 3:30 PM - 5:00 PM Mar 21, 2008
Where 1670 CSE
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Craig B. Arnold, Princeton University

Shaping Laser Interactions: Direct-Write Processing From Solar Cells to Stem Cells and Beyond

The ability to locally modify materials through laser based direct-write (LDW) techniques enables the formation of structures and material properties that cannot be produced through alternative means. In this presentation, we examine the fundamentals of laser-matter interactions in the context of energy storage and biological applications, with particular emphasis on the material modifications that are induced during LDW deposition. Results show that these methods enable us to independently control the electronic and protonic transport in energy storage systems leading to improved high rate performance. By developing methods to shape the mechanical and thermal interactions we gain additional control over the local material properties. In particular, the use of mechanically deformable absorbing layers and spatial shaping of Gaussian beams through newly developed high speed adaptive optical elements enables reliable deposition of delicate materials such as living mammalian embryonic stem cells for tissue engineering applications or organic semiconducting molecules for photovoltaic applications. Time permitting, we will build upon these approaches, and discuss extensions to LDW processing that enable processing below the diffraction limit using a combination of Bessel beam generation, optical trapping and near-field optical effects.

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