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Singapore University of Technology and Design

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The approach leverages plasmonic resonators that convert light into collective electron oscillations. When these electrons travel ballistically—without scattering from impurities—they can reflect off the device’s carefully shaped surfaces like billiard balls. Some scatter back, while others are funnelled through a central “neck” in bow tie–shaped resonators, leading to an asymmetric current flow and frequency doubling.

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SUTD

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