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Technical University of Munich

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Electrically driven nanowire lasers as future light source for Si photonics

Master Thesis in EI / Physics Engineering: Integrated Light Sources for Si Photonics

14.05.2020, Diplomarbeiten, Bachelor- und Masterarbeiten

Monolithically integrated light sources on Si photonic circuits play a major role in emerging Si photonics and on-chip sensing applications. Hereby, free-standing nanoscale light sources with unique optical properties are very attractive as they can be integrated site-selectively and with high integration density on Si photonics circuitry. This M.Sc. thesis topic aims to develop a new electrical injection scheme for high-performance III-V semiconductor nanowire lasers directly integrated on silicon to realize electrically pumped nanowire lasers in the optical data communications wavelength region for the first time.

III-V semiconductor nanowire lasers combine the superior optical properties of the established III-V materials with the possibility of a site-selective and monolithic integration on a common silicon-on-insulator platform. Their recent integration on silicon waveguides marked a crucial milestone towards their usage as coherent light sources for future silicon photonics applications. However, so far pumping of nanowire lasers is done optically while electrical injection is crucial for a useful application as on-chip light source.

The goal of this M.Sc. project is the realization of standing nanowire lasers on a silicon platform and the characterization of their electrical and electro-optical properties. Hereby, you will be closely working together with a PhD student. Your work will be settled over the whole fabrication process line from the first design of sophisticated nanowire heterostructures over their fabrication further to their analysis. The design will be guided by simulations for optimized laser cavity properties as well as electronic simulations of the doped heterostructures. Nanowire lasers should then be realized on lithographically patterned substrates by various bottom-up/top-down nanofabrication processes, including state-of-the-art processing in cleanroom environment. From electrical and optical characterization of the wires you should derive correlations between heterostructure design, electronic properties, contact behavior and electroluminescence to drive the optical emission properties of the nanowires into the lasing regime.

Requirements: Experience in the area of clean room fabrication and nanoanalytics as well as experience in simulations would be beneficial. Furthermore, some data analysis skills would be good: Python or MATLAB, Origin,MS Office.
Nevertheless, the most important requirements are motivation and commitment.

What you will gain and learn: Advanced clean room processes for state-of-the-art 3D structured nanowires, Nanoanalytics and imaging techniques (SEM, AFM. Expertise in measurements of electrical and optical properties of nanowire heterostructures (Low-noise I-V characterization, Photo- & Electroluminescence spectroscopy).

In summary, you are going to develop hands-on experience on a substantial pool of nanofabrication and -analytics methodologies available at WSI/ZNN, while contributing to a technologically and scientifically extremely relevant topic in integrated photonics. Additionally, you will get the chance to work in a top semiconductor research institute with a productive working atmosphere and a great team spirit.

Application: If you are interested in this topic or if you have any questions please send a mail to tobias.schreitmueller@wsi.tum.de or gregor.koblmueller@wsi.tum.de. Please include your CV, transcript of records and your Bachelor’s Thesis

Kontakt: Gregor.Koblmueller@wsi.tum.de

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