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Proceedings Paper

Influence of morphology on the lasing behavior of pyrromethene 597 in a holographic polymer dispersed liquid crystal reflection grating
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Paper Abstract

Interference lithography of polymer dispersed liquid crystals allows rapid, facile fabrication of complex polymeric photonic structures that have an inherent electro-optic component for agile structures. The polymerization mechanism (step-growth or chain growth) strongly influences the morphology of the LC droplet and distribution within the polymer matrix. Using a multi-functional acrylate monomer that undergoes chain growth polymerization leads to asymmetrical LC droplets of random size and distribution, in contrast to the step-growth mechanism of thiol-ene formation where LC droplets form with a nearly uniform size distribution and spherical shape. Thiol-ene holographic polymer dispersed liquid crystals (H-PDLCs) diffraction structures have narrower bandwidth and less baseline scatter than the acrylatebased H-PDLCs. Furthermore, distributed feedback lasers constructed from thiolene-based H-PDLC lasers show marked improvement in the optical and electro-optical properties as evinced by the factor of two decrease in switching voltage and the reduction of lasing threshold from 0.17 mJ cm-2 to 0.07 mJ cm-2. These differences in optical and electro-optic properties directly correlate with the difference in microscale morphology of the H-PDLCs giving insight to the importance of microscale structure on macroscale phenomenon.

Paper Details

Date Published: 30 August 2006
PDF: 7 pages
Proc. SPIE 6322, Tuning the Optic Response of Photonic Bandgap Structures III, 63220A (30 August 2006); doi: 10.1117/12.682255
Show Author Affiliations
Rachel Jakubiak, Air Force Research Lab. (United States)
Dean P. Brown, Air Force Research Lab. (United States)
Lalgudi V. Natarajan, Science Applications International Corp. (United States)
Vincent Tondiglia, Science Applications International Corp. (United States)
Pamela Lloyd, UES, Inc. (United States)
Richard L. Sutherland, Science Applications International Corp. (United States)
Timothy J. Bunning, Air Force Research Lab. (United States)
Richard A. Vaia, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 6322:
Tuning the Optic Response of Photonic Bandgap Structures III
Paul V. Braun; Sharon M. Weiss, Editor(s)

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