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Photochemistry of refractive index structures in poly(methyl methacrylate) by femtosecond laser irradiation
Alexandra Baum, Patricia J. Scully, Maria Basanta, C. L. Paul Thomas, Peter R. Fielden, Nicholas J. Goddard, Walter Perrie, and Paul R. Chalker
Optics Letters. 2007;Vol. 32, Issue 2:190-192.
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Abstract
Femtosecond, subablation threshold photomodification of poly(methyl methacrylate) (PMMA) at 387nm is explored to enable fabrication of optical components. Volatile fragment analysis (thermal desorption gas chromatography-mass spectrometry) and molecular weight distribution monitoring (size exclusion chromatography) suggest photochemical modification, involving direct cleavage of the polymer backbone and propagation via chain unzipping under formation of monomers, similar to the pyrolytic degradation of PMMA. Waveguides were produced in undoped, clinical-grade PMMA, showing an increased refractive index in the laser focal region (Δnmax=4Ă—10−3).
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- Related website http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-32-2-190