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Proceedings Paper

Laser-array generators produced by patterned ion irradiation of acrylic films
Author(s): Brian G. Hoover; Chase K. McMichael; Lowell T. Wood; Zuhua Zhang; Jia-Rui Liu; Wei-Kan Chu
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Paper Abstract

Ion irradiation of polymer films is a promising process technology for photonics applications that require flexible, lightweight devices resistant to selected environmental variables. Crossed phase gratings that may serve as laser-beam array generators are fabricated using the dry process of irradiation of acrylic (PMMA) films with various doses of high-energy alpha particles through a stencil mask. The gratings are examined with the aid of AFM and SEM images, and Raman-Nath diffraction analysis is applied to estimate the generated refractive-index modulation as a function of the dose. SEM images of a stained grating cross-section suggest a mechanism of unsaturated bond formation and accompanying contraction of the irradiated polymer. Post-irradiation baking is shown to increase the contraction or generated surface relief by around an order of magnitude. Since the index modulation and surface relief due to irradiation tend to cancel, the overall diffraction effciencies of unbaked gratings do not surpass 67%, although baked gratings can provide higher diffraction effciencies.

Paper Details

Date Published: 30 August 2005
PDF: 10 pages
Proc. SPIE 5897, Photonics for Space Environments X, 589706 (30 August 2005); doi: 10.1117/12.619144
Show Author Affiliations
Brian G. Hoover, Advanced Optical Technologies (United States)
Chase K. McMichael, Texas Ctr. for Superconductivity, Univ. of Houston (United States)
Lowell T. Wood, Univ. of Houston (United States)
Zuhua Zhang, Texas Ctr. for Superconductivity (United States)
Univ. of Houston (United States)
Jia-Rui Liu, Texas Ctr. for Superconductivity (United States)
Univ. of Houston (United States)
Wei-Kan Chu, Texas Ctr. for Superconductivity (United States)
Univ. of Houston (United States)

Published in SPIE Proceedings Vol. 5897:
Photonics for Space Environments X
Edward W. Taylor, Editor(s)

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