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Efficient infrared electroabsorption with 1 V applied voltage swing using intersubband transitions
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
2008 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 93, no 19, 191101Article in journal (Refereed) Published
Abstract [en]

We have demonstrated efficient intersubband electroabsorption in InGaAs/InAlGaAs/InAlAs step quantum wells grown by metal-organic vapor-phase epitaxy. An absorption modulation of 6 dB (Delta alpha=2300 cm(-1)) at lambda similar to 5.7 mu m due to Stark shift of the intersubband resonance was achieved at a low applied voltage swing of +/- 0.5 V in a multipass waveguide structure. The interface intermixing was estimated by comparing experimental and theoretical Stark shifts. It is predicted that the present material in a strongly confining surface plasmon waveguide can yield an electroabsorption modulator with a peak-to-peak voltage of V-pp=0.9 V and modulation speed of f(3dB)approximate to 130 GHz.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2008. Vol. 93, no 19, 191101
Keyword [en]
aluminium compounds, electroabsorption, electro-optical modulation, gallium arsenide, III-V semiconductors, indium compounds, infrared, spectra, optical waveguides, semiconductor quantum wells, spectral line, shift, Stark effect, surface plasmons, quantum cascade lasers, stark shift, modulator, wells, exchange
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-17977DOI: 10.1063/1.3013360ISI: 000260944100001Scopus ID: 2-s2.0-56249147462OAI: oai:DiVA.org:kth-17977DiVA: diva2:336022
Funder
Swedish Research Council
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-07-22Bibliographically approved

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Holmström, PetterJänes, PeterEkenberg, UlfThylén, Lars
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