Seminarium Optyczne

Transition metal dichalcogenides (TMDs) attract research interest due to their optical and excitonic properties. A large, anisotropic refractive index of many semiconducting TMDs makes them attractive for nanophotonic applications. Design of such nanostructures requires knowledge of dielectric constants, which can then be used for single particle resonators, photonic crystals, waveguides, arrays of nanoparticles as well as their inverse designs. Here, I will discuss two cases. The first is design and fabrication of efficient nonlinear TMD nanodisks based on MoS2, which provide close to four orders of magnitude enhancement of second harmonic generation. The second example realizes high-quality nanohole-based metasurfaces in an MoS2 nanofilm. Depending on the nanohole shape, the metasurfaces can be tailored to support broken in-plane symmetry, allowing for realization of quasi-bound-states-in-the-continuum.