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2D Photonic crystal thermo-optic switch based on AlGaAs/GaAs epitaxial structure

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Abstract

The realisation of a thermo-optically controlled symmetric Mach-Zehnder interferometer switch based on an AlGaAs/GaAs epitaxial waveguide structure operating at wavelengths in the region of λ=1550 nm is reported. The device is based on a very compact two-dimensional photonic crystal channel waveguide structure. The measured and simulated transmission spectra for the devices are in good agreement. The π-phase shift switching power for the device is as low as 42 mW.

©2004 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. (a) Scanning electron micrograph of Mach-Zehnder switch device showing the NiCr heater on top of one arm of the structure. (b) Detail of interface between 150 nm thick NiCr heater layer and 300nm thick Au contact layer.
Fig. 2.
Fig. 2. Graph of transmission spectra: the dashed line shows simulation results and the bold line shows measured results. The y-axis is the normalised optical power output.
Fig. 3.
Fig. 3. Normalized optical power against electrical switching power measured at λ=1540 nm.

Equations (2)

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Δ T = ( n T ) 1 λ 2 l active = 250 ° C
P π = Δ T σ AlGaAs ( W l ) active d = 20 m W
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