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Proceedings Paper

Fabrication of high-temperature-resistant laser-induced gratings with large refractive index modulation: space-selective precipitation of Ge nanoparticles in glasses
Author(s): Hiroaki Nishiyama; Isamu Miyamoto; Kenji Kintaka; Junji Nishii
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Paper Abstract

High-temperature-resistant laser-induced Bragg gratings were formed in Ge-B-SiO2 thin glass films fabricated by the plasma enhanced chemical vapor deposition method. Such gratings were induced by exposure of an interference pattern with KrF excimer laser and subsequently annealing at 600°C. The SEM observation of the grating after HF etching revealed that the origin of the grating was the periodic precipitation of crystalline 20 - 40 nm-diameter Ge nanoparticles. Nanoparticles precipitated predominantly in the unirradiated region after laser-induced refractive index change completely erased after annealing up to 500°C. The maximum value of refractive index modulation Δn was 6.8 x 10-3 at 632.8 nm, which corresponds to the Δn nearly 10 times as large as that before annealing. A channel waveguide with high-temperature-resistant-grating exhibited high diffraction efficiency and excellent thermal stability.

Paper Details

Date Published: 8 October 2004
PDF: 6 pages
Proc. SPIE 5662, Fifth International Symposium on Laser Precision Microfabrication, (8 October 2004); doi: 10.1117/12.596299
Show Author Affiliations
Hiroaki Nishiyama, Osaka Univ. (Japan)
Isamu Miyamoto, Osaka Univ. (Japan)
Kenji Kintaka, National Institute of Advanced Industrial Science and Technology (Japan)
Junji Nishii, National Institute of Advanced Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 5662:
Fifth International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Henry Helvajian; Kazuyoshi Itoh; Kojiro F. Kobayashi; Andreas Ostendorf; Koji Sugioka, Editor(s)

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