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Proceedings Paper

Light propagation characteristics of photonic crystal waveguide for miniaturized ultrafast optical-pulse control/delay devices
Author(s): Yoshimasa Sugimoto; Naoki Ikeda; Niclas Carlsson; Noriko Kawai; Kuon Inoue; Kiyoshi Asakawa
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Paper Abstract

Photonic crystals (PCs) having two-dimensional (2D) periodicity on a length scale of 320-450 nm were fabricated by electron beam lithography in combination with high- aspect-ratio dry etching. To achieve three-dimensional control of the optical properties, three kinds of dielectric waveguide structures based on AlGaAs heterostructures, that is, semiconductor-clad (SC), air-bridge (AB), and oxide-clad (OC) structures, were investigated. Observation of light propagating through such photonic crystal devices was employed by optical transmission measurements. Clear photonic bandgap effects resulting in 30-dB attentuation of the transmitted light could be observed in the the bandgap regions. The measured results were in good agreement with calculated band-structures and transmission spectra using a Fine-Difference Time-Domain (FDTD) method. Straight, sixty degree-bent and Y-branch defect waveguides (D-WGs) in a 2D- PC slab were fabricated, and the resulting light propagation characteristics were measured by two methods. One was measurement of transmission spectra at wavelengths ranging from 850 to 1100nm. Another was plan-view observation of the optical beam race trace along the waveguide measured with an IR-vidicon camera. Three-dimensional FDTD simulations for the band structure and transmission spectra in the air- bridge slab with and without defect waveguides resulted in the appearance of four defect propagation modes specific to the defect waveguide, between two slab modes for the defect- free PC slab. As an example of the future-promising application of the 2D-PC slab, an ultra-small and ultra-fast optical switching device including quantum dots as large optical non-linearity (%chi3+S) media is proposed. To demonstrate such a device, recent advancement of a nano- probe assisted processing of arrayed quantum dots is discussed. Achievement of this technology will provide us with a possibility of extremely miniaturized all-optical switching devices in the OTDM optical communication network.

Paper Details

Date Published: 30 October 2001
PDF: 15 pages
Proc. SPIE 4598, Photonics Technology in the 21st Century, (30 October 2001); doi: 10.1117/12.447092
Show Author Affiliations
Yoshimasa Sugimoto, Femtosecond Technology Research Association (Japan)
Naoki Ikeda, Femtosecond Technology Research Association (Japan)
Niclas Carlsson, Femtosecond Technology Research Association (Japan)
Noriko Kawai, Hokkaido Univ. (Japan)
Kuon Inoue, Hokkaido Univ. (Japan)
Kiyoshi Asakawa, Femtosecond Technology Research Association (Japan)

Published in SPIE Proceedings Vol. 4598:
Photonics Technology in the 21st Century

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