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B02: Nonlinear optics and coherent intersubband physics of cubic GaN/Al(Ga)N heterostructures

M. Sc. Jan Mundry
GaN/Al(Ga)N multi-quantum well sample shaped in a waveguide structure to increase the light matter interaction length.

M. Sc. Jan Mundry, AG Betz

What is the challenge of my research project? Why am I eager to do it?
Since 2016 I am a member of the TRR142, involved in the project B02 as a PhD student. In this project, I focus on the experimental studies of intersubband physics of cubic GaN/Al(Ga)N heterostructures. In particular I characterize the nonlinear optical properties of the designed near-infrared intersubband transitions using modern methods of time-resolved femtosecond spectroscopy (especially in the telecom window of 1.3 – 1.55 μm). As an important step beyond, we will cooperate with project A08 and C05 and fabricate nonlinear metasurfaces by depositing antenna structure resonant to the intersubband transitions. Furthermore I investigate linear and nonlinear optical properties of VO2 nanoparticles embedded in fused silica that show a pronounced optically and thermally induced change of the dielectric function in the telecom wavelength as well.

Why did I choose this project?
My project is a cooperation in between the group of Donat As (UPB) who fabricates the theoretically designed heterostructures by molecular beam epitaxy and the group of Markus Betz (TU DO) where I am working on the optical sample characterization. Taking into account the cooperation with project A08 and C05, each of these groups contributes extensive knowledge of their field of research to enable novel optical functionalities and I would like to be part of this critical endeavor.