Realization of efficient electroabsorption using intersubband transitions in step quantum wells

Details Realization of efficient electroabsorption using intersubband transitions in step quantum wells Realization of efficient electroabsorption using intersubband transitions in step quantum wells

2007-10-31

arxiv.org/abs/0710.5851v1

Physics

Optics

3 pages, 3 figures

Scientific paper

We have demonstrated efficient intersubband electroabsorption in InGaAs/InAlGaAs/InAlAs step quantum wells grown by metal-organic vapor phase epitaxy (MOVPE). An absorption modulation of 6 dB at $\lambda=6.0 \mu$m due to Stark shift of the IS absorption was achieved at a low voltage swing of $\pm 0.5$ V in a multipass waveguide structure. Based on the experimental results it is estimated that an electroabsorption modulator with a low peak-to-peak voltage of $V_{pp}=0.9$ V can yield a modulation speed of $f_{3dB} \approx 120$ GHz with the present material by using a strongly confining surface plasmon waveguide of 30 $\mu$m length.

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