Presentation Information
[8p-PB3-46]Electrochemically Intercalated Bulk WS2 Metasurfaces for Gate-Tunable Nanophotonics
〇(P)Matej Sebek1, Daisuke Kiriya1 (1.University of Tokyo)
Keywords:
2d semiconductor,metasurface,intercalation
Transition metal dichalcogenides combine an exceptionally high refractive index with strong excitonic response, but a trade-off persists: monolayers are bright and tunable yet too thin for strong light-matter interaction, while bulk crystals are optically thick but neither tunable nor brightly emissive. Here we show that electrochemical intercalation of bulk WS2 with large organic cations such as CTA+ recovers both brightness and tunability. We pattern hexagonal hole-array metasurfaces in bulk WS2 by electron-beam lithography and SF6 etching, then intercalate within an electrochemical cell. Across more than eight intercalant species, we observe large and reversible photoluminescence modulation under gate voltage, consistent with electrostatic doping and charged excitonic states. The intercalated state stays stable over repeated cycles, establishing intercalation as a scalable, high-contrast platform for active visible-range nanophotonic metasurfaces.