ONLINE Halbleiter zum Frühstück - Active photonic nanostructures empowered by 2D-semiconductors

Optical metasurfaces, two-dimensional arrangements of designed nanoresonators, offer unique opportunities for controlling light fields and for tailoring the interaction of light with nanoscale matter. Due to their flat nature, their integration with two-dimensional materials consisting of only a single molecular layer is particularly interesting [1]. This talk reviews our recent and ongoing activities in hybridizing optical metasurfaces composed of resonant metallic or dielectric building blocks with two-dimensional semiconductors, specifically with monolayer transition metal dichalcogenides (2D-TMDs). We demonstrate that the ability of the nanoresonators to concentrate light into nanoscale volumes can be utilized to carefully control the properties, such as pattern and polarization, of light emitted by 2D-TMDs via photoluminescence or nonlinear processes [2,3]. In particular, we study the ability of tailored nanostrcutures to interact selectively with exciton populations located at inequivalent conduction band minima at the corners of the 2D-TMD’s Brillouin zone. Such a selective intraction is an important prerequisite for the realization of future miniaturized valleytronic devices.

References:

1. R. Mupparapu et al., “Integration of two-dimensional transition metal dichalcogenides with Mie-resonant dielectric nanostructures”, Advances in Physics: X 5, 1734083 (2020).
2. T. Bucher et al., “Tailoring photoluminescence from MoS2 monolayers by Mie-resonant metasurfaces”, ACS Photonics 6, 1002–1009 (2019).
3. F. J. F. Löchner et al., „Hybridization of dielectric metasurfaces with chemical vapor deposition grown MoS2 monolayers for enhanced second-harmonic generation“, ACS Photonics 8, 218 (2020).