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Group velocity inversion in AlGaAs nanowires

J. Meier, W. S. Mohammed, A. Jugessur, L. Qian, M. Mojahedi, and J. S. Aitchison

Open Access Open Access

Abstract

We investigated the dispersion characteristics of submicron sized AlGaAs waveguides. Numerical simulations shows that the tight confinement of the optical waves in such nanowires leads to strong variations of the dispersion characteristics compared to classic, weakly guided waveguides of the same material system. We found numerically that the investigated structure has negative GVD for the TE mode provided the waveguide width is between 670 nm and 280 nm. Experimental data obtained from 300 μm - 1 mm long wires confirms the numerical results.

©2007 Optical Society of America

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Figures (11)
Fig. 1.
Fig. 1. Structure

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Fig. 2.
Fig. 2. Example of a TE mode for 250 nm wide waveguide. (Arrow: electric field)

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Fig. 3.
Fig. 3. GVD dependence on waveguide width and core height at a wavelength of 1.55 μm.

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Fig. 4.
Fig. 4. GVB vs. wavelength and width. (h = 0.5 μm)

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Fig. 5.
Fig. 5. Effective index of TE00 and TM00 vs. waveguide width for a wavelength of 1.55 μm.

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Fig. 6.
Fig. 6. (a) Nano-wire general structure with tapering and feed. (b) The length parameters for the four different designs.

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Fig. 7.
Fig. 7. (a) SEM image of fabricated nanowires. (b) Fringe period determined from measured spectra

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Fig. 8.
Fig. 8. Group index ng vs. waveguide width for a wavelength of 1.55 μm.

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Fig. 9.
Fig. 9. GVD vs. waveguide width for wavelength of 1.55 μm.

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Fig. 10.
Fig. 10. GVD vs. wavelength for width of 668 nm, 323 nm and 280 nm. (core height = 0.5 μm)

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Fig. 11.
Fig. 11. Effective area vs. waveguide width for a core height of 500 nm and a wavelength of 1.55 μm

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Equations (6)

Equations on this page are rendered with MathJax. Learn more.

Λ = Λ 0 + Λ 1 ( λ − λ 0 ) + 1 2 Λ 2 ( λ − λ 0 ) 2
d 2 β d λ 2 = π Λ 0 2 d Λ 1 .
n g = − λ 2 2 π dβ dλ
β″ = λ 3 ( 2 πc ) 2 [ 2 dβ dλ + d 2 β d λ 2 ]
β total ″ d = β feed ″ d feed + β taper ″ d taper + β wire ″ d wire
A eff = [ ∬ I ( x , y ) d x d y ] 2 ∬ C o r e I 2 ( x , y ) d x d y
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