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Fundamentals of Laser-Material Interaction and Application to Multiscale Surface

Summary: Chapter 4
Fundamentals of Laser-Material Interaction
and Application to Multiscale Surface
Matthew S. Brown and Craig B. Arnold
Abstract Lasers provide the ability to accurately deliver large amounts of energy
into confined regions of a material in order to achieve a desired response. For
opaque materials, this energy is absorbed near the surface, modifying surface chem-
istry, crystal structure, and/or multiscale morphology without altering the bulk. This
chapter covers a brief introduction to the fundamental principles governing laser
propagation and absorption as well as the resulting material responses. We then
highlight two case studies of improving efficiency in photovoltaic and optoelec-
tronic devices as well as optimizing cell-surface interactions in biological interfaces.
4.1 Introduction
Modification of surface properties over multiple length scales plays an important
role in optimizing a material's performance for a given application. For instance,
the cosmetic appearance of a surface and its absorption properties can be controlled
by altering its texture [1, 2] and presence of chemical impurities in the surface [3].
A material's susceptibility to wear and surface damage can be reduced by altering
its surface chemistry, morphology, and crystal structure [4]. Also, one can consider


Source: Arnold, Craig B. - Department of Mechanical and Aerospace Engineering, Princeton University


Collections: Engineering; Materials Science