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Colloquia Series with Isabelle Staude
“Active metasurfaces empowered by two-dimensional materials”

Optical metasurfaces have been established as a versatile platform for manipulating light fields at the nanoscale. While initial research efforts were concentrated on purely passive structures, metasurfaces also hold a huge potential for dynamic control of light fields, as well as for tailoring light emission processes, such as spontaneous emission and nonlinear frequency generation. Monolayer transition metal dichalcogenides (ML-TMDCs), due to their unique optical, electronic and optoelectronic properties as well as their flat nature, are a highly attractive material choice for integrating such active functionalities into the metasurface architecture.

This talk reviews our recent and ongoing activities in hybridizing optical metasurfaces composed of resonant metallic or dielectric building blocks with ML-TMDCs. 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-TMDCs via photoluminescence or nonlinear optical processes. Furthermore, we investigate the ability of tailored nanostructures to interact selectively with exciton populations located at inequivalent conduction band minima at the corners of the ML-TMDC’s Brillouin zone. Finally, we suggest that resonant nanoantennas can be used to probe the nature of chiral emission from ML-TMDCs. Altogether, our results contribute to a better fundamental understanding of coupling of photonic nanostructures to excitons in ML-TMDCs and are an important step towards the realization of future miniaturized active metasurface and valleytronic devices.

Jul 6, 2022 04:30 PM in Canberra, Melbourne, Sydney

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