Photonic platforms are envisioned to play a pivotal role across various domains including information processing and towards the development of next generation of quantum technologies. Atomically thin semiconductors are a promising ingredient for combination with photonic structures as they provide strong light-matter interaction and inherent spin-valley locking of excitons generated with different circularly polarized light. In this work, we show two different applications of two-dimensional transition-metal dichalcogenides. First, we demonstrate a chiral metasurface that allows reflection of selective polarization of light within a narrow spectral band utilizing the valleytronic properties. Second, we propose electro-optic phase modulators based on monolayer semiconductors for integration in large-scale photonic circuits.
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