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2D microcavity structures and plasmonic nanostructures for lasing and light—matter interaction

In 2D layered materials, such as transition-metal dichalgogenides (TMDs), strong light—matter interaction is obtained even when only one layer of the 2D crystal structure is given. The absorbance can be quite high for a single layer, and the emission bright when compared with the same material of higher thickness. This is due to the direct band gap in monolayer TMDs, which among others render them promising candidates for gain materials in laser structures.

In this project work, we offer you to get involved in the study of optical properties of 2D-material-based microresonators of different kind that are fabricated by simple means in Marburg in order to achieve novel device concepts for lasing. The work will be conducted in collaboration with partners from the Columbia University, the Stevens Institute of Technology New Jersey, and the Zhejiang University of Hangzhou, China.

Suitable monolayer resonator combinations will give rise to light—matter interaction and in some cases even lasing activity. For any of these structures, certain device properties need to be analyzed. Temperature- and power-dependent emission will be studied. In addition to the use of optical cavities, plasmonic structures and antennas can boost the performance of optical excitation and light—matter interaction involving 2D structures/materials.

What will you learn in our team: You will use common microscopy and spectroscopy techniques in order to characterize 2D materials in combination with optical microcavities. Furthermore, you will become acquainted with a simple fabrication method to produce own monolayer materials and resonator systems with 2D materials. Your first practical experience in the field of optical microresonators and semiconductor spectroscopy will equip you with insight and understanding regarding microstructures and nanophotonics. Moreover, an exchange to one of the partners abroad could be possible within a master project, with the help of suitable stipends.

Contact: Dr. Arash Rahimi-Iman

You may find additional information on "Spectroscopy on new materials and nanophotonics" in our research sector.