PD Dr. techn. Gregor Koblmüller

+49 89 289-12779
Visitenkarte in TUMonline
Fakultät für Physik
Halbleiter-Nanostrukturen und -Quantensysteme
Privatdozent am Physik-Department

Lehrveranstaltungen und Termine

Ausgeschriebene Angebote für Abschlussarbeiten

Development of InGaAs-based nanowire lasers for Si photonics

At the Walter Schottky Institut we have recently gained great expertise in exploring nanowire (NW) lasers as the smallest possible semiconductor-based coherent light sources. One of their most promising features is that they can be also integrated onto silicon (Si) platform and thereby provide a nanoscale source for potential operation in Si photonic circuits.

An important step forward towards integration into Si photonic circuits is to control the emission wavelength of the nanowire laser in the technologically relevant spectral range of 1.3 – 1.55 um. For this reason it is necessary to develop new active gain materials in III-V based nanowire lasers, such as InGaAs multi-quantum well structures inside NW Fabry-Perot resonator cavities, and integrate these onto Si-based ridge waveguides.

The aim of this project is to develop long-wavelength InGaAs-based quantum wells incorporated in GaAs-based resonator cavities using sophisticated nanofabrication and characterization methodologies. Interacting closely with a PhD student you will be designing and synthesizing these laser structures using molecular beam epitaxy, and then characterizing their laser metrics by confocal micro-photoluminescence spectroscopy (uPL). The design and characterization may also be supported by state-of-the-art simulations of the laser gain spectrum and optical waveguiding properties. Ultimately, the InGaAs-based NW lasers should be integrated directly onto Si-ridge waveguides. Here, you will be actively exploiting various semiconductor processing techniques to fabricate the desired templates for direct monolithic integration. The coupling and lasing mode propagation between NW laser and Si waveguide will then be investigated by two-axis uPL experiments.

In this thesis, you will be closely working with several other student members in the Nanowire Group at WSI, led by PD. Dr. Gregor Koblmueller. Experience in the area of clean room fabrication or optical spectroscopy is a benefit, but secondary to motivation and commitment. Applications should be sent to Gregor.Koblmueller@wsi.tum.de or Jochen.Bissinger@wsi.tum.de. Please include your CV, a copy of your Bachelor Thesis and a transcript of your grades (Bachelor & Master).

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Gregor Koblmüller

Kondensierte Materie

Wenn Atome sich zusammen tun, wird es interessant: Grundlagenforschung an Festkörperelementen, Nanostrukturen und neuen Materialien mit überraschenden Eigenschaften treffen auf innovative Anwendungen.

Kern-, Teilchen-, Astrophysik

Ziel der Forschung ist das Verständnis unserer Welt auf subatomarem Niveau, von den Atomkernen im Zentrum der Atome bis hin zu den elementarsten Bausteinen unserer Welt.


Biologische Systeme, vom Protein bis hin zu lebenden Zellen und deren Verbänden, gehorchen physikalischen Prinzipien. Unser Forschungsbereich Biophysik ist deutschlandweit einer der größten Zusammenschlüsse in diesem Bereich.