Abstract

The possibility of combining functional compounds and plasmonic nanoparticle clusters opens new doors for developing smart and tunable nanoscale devices. Here, by merging an optothermally controllable phase-changing substance (Ge <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Te <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> and a six-member hexamer assembly, we tailored a plasmonic modulator to operate at the telecommunication band. Taking the advantage of entirely opposite behavior of Ge <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Te <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> at different temperatures, we excited functional charge transfer plasmons with ON/OFF ability to design a plasmonic modulator for $C$ -band applications. This understanding paves new methods to develop advanced, integrated, and tunable plasmonic devices.

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