Change search
ReferencesLink to record
Permanent link

Direct link
High speed optical modulation in Ge quantum wells using quantum confined stark effect
Show others and affiliations
2012 (English)In: Frontiers of Optoelectronics, ISSN 2095-2759, Vol. 5, no 1, 82-89 p.Article in journal (Refereed) Published
Abstract [en]

We focus on the optimization of SiGe material deposition, the minimization of the parasitic capacitance of the probe pads for high speed, low voltage and high contrast ratio operation. The device fabrication is based on processes for standard Si electronics and is suitable for mass-production. We present observations of quantum confinement and quantum-confined Stark effect (QCSE) electroabsorption in Ge quantum wells (QWs) with SiGe barriers grown on Si substrates. Though Ge is an indirect gap semiconductor, the resulting effects are at least as clear and strong as seen in typical III-V QWstructures at similar wavelengths. We also demonstrated a modulator, with eye diagrams of up to 3. 5 GHz, a small driving voltage of 2. 5 V and a modulation bandwidth at about 10 GHz. Finally, carrier dynamics under ultra-fast laser excitation and high-speed photocurrent response are investigated.

Place, publisher, year, edition, pages
2012. Vol. 5, no 1, 82-89 p.
Keyword [en]
electroabsorption effect, Ge, Ge/SiGe quantum wells (QWs), optical interconnections, optical modulators, quantum-confined Stark effect (QCSE)
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-118770DOI: 10.1007/s12200-012-0194-9ScopusID: 2-s2.0-84873836361OAI: diva2:608112

QC 20130226

Available from: 2013-02-26 Created: 2013-02-26 Last updated: 2013-02-26Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Thylén, LarsChacinski, Marek
By organisation
Microelectronics and Applied Physics, MAP
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 34 hits
ReferencesLink to record
Permanent link

Direct link