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Semiconductor periodic structures for out-of-plane optical switching and Bragg-soliton excitation

T. G. Brown, R. P. Fabrizzio, and S. M. Weiss

Open Access Open Access

Abstract

We study out-of-plane coupling and switching in a semiconductor periodic waveguide structure, with attention given to both dispersion within the structure and impedence matching of an external wave with a guided mode. We show nanosecond-scale optical switching and discuss the implications for Bragg soliton excitation.

©1998 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic of the periodic structures investigated. The thicknesses t1 and t2 are optimized for each design.

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Fig. 2.
Fig. 2. a) Reflectance spectrum for a structure designed for fourth-order coupling and second-order Bragg reflection. (t1 = 120 nm, t2 = 62 nm) b) The calculated dispersion relation.

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Fig. 3
Fig. 3 Reflected pulse (red/solid) for a structure optimized for λ=1064 nm at a 2.3° angle of incidence. The dashed/blue line shows the shape of the incident Nd:YAG pulse.

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Fig. 4
Fig. 4 Experimental apparatus for reflectance measurement near λ=1550 nm.

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Fig. 5
Fig. 5 Measured reflectance spectrum of a structure optimized for λ=1550 nm at normal incidence. (t1 = 180 nm, t2 = 90 nm) Red trace: Experimental Results. Blue/Dashed: predicted reflectance.

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Equations (1)

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N κ L Δ n N L ≈ 30
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