Excitons in 2D materials like transitional metal dichalcogenides (TMDCs) are important platforms for quantum information science (QIS). However, their short exciton lifetime and spin coherence time prevents them from being employed as on-chip devices in QIS. A dielectric metasurface that localizes light both temporally and spatially offers a new platform to enhance valley-polarized emission from TMDCs. We design and experimentally demonstrate a high-quality-factor Si metasurface with chiral “meta-atoms” that can strongly suppress intervalley scattering and enhance valley-polarized emission, potentially enabling room-temperature operation in strong-coupling regime.
Studying molecules and nanoparticles one at a time provides valuable information about their chemistry and physics, including temporal dynamics and heterogeneity. Our group developed a technique using microresonators as ultrasensitive thermometers, with which we study single nanoparticles using photothermal absorption spectroscopy. I will present recent progress in which we applied this technique to study and control the chemical dynamics of single gold nanorods under aqueous conditions. This advancement adds both to the toolkit of single particle techniques and the versatility of microresonator technology. I will also describe outstanding challenges and recent progress in adapting this technique for more sensitive experiments.
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