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COMPARISON OF PHOTOINDUCED ATOM DISPLACEMENTS IN GLASSES AND POLYMERS

H. Jain1,*

Affiliation

  1. Department of Materials Science and Engineering, Lehigh University Bethlehem, PA 18015, USA

Abstract

When exposed to visible-UV light, photoinduced atom displacement (PAD) may occur in certain inorganic glasses as well as polymers, leading to similar changes in their opto electronic and structural properties. An understanding of PAD is important for the use of these materials in photonic applications such as optical storage, CD-RW, opto-mechanical transducers, etc. In both classes of materials, PAD is caused by a combination of electronic excitation and subsequent response of the structure to the excited state configuration. There are indications of photoinduced localized atomic restructuring as well as long-range diffusion, which require bond-breaking. In spite of the initially homogeneous, isotropic structure, the photoinduced effects can be anisotropic, depending on the direction of polarization and/or the direction of light propagation. In general, the PAD in polymers is much larger but less stable than that in glasses, presumably due the greater adaptability of polymer structure to the optically created polarization and other stresses. A combination of these characteristics in a single glass-polymer or organic-inorganic material is likely to yield superior photoinduced properties. A comparative overview of PAD in inorganic glasses and polymers is presented in this paper..

Keywords

Photoinduced effects, Atom movement, Glass, Polymer.

Submitted at: Feb. 27, 2003
Accepted at: March 12, 2003

Citation

H. Jain, COMPARISON OF PHOTOINDUCED ATOM DISPLACEMENTS IN GLASSES AND POLYMERS, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 5-22 (2003)