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- W2863908587 abstract "Ultrasound detection is one of the most important nondestructive subsurface characterization tools of materials, whose goal is to laterally resolve the subsurface structure with nanometer or even atomic resolution. In recent years, graphene resonators attracted attention as loudspeaker and ultrasound radio, showing its potential to realize communication systems with air-carried ultrasound. Here we show a graphene resonator that detects ultrasound vibrations propagating through the substrate on which it was fabricated. We achieve ultimately a resolution of $approx7$~pm/$mathrm{sqrt Hz}$ in ultrasound amplitude at frequencies up to 100~MHz. Thanks to an extremely high nonlinearity in the mechanical restoring force, the resonance frequency itself can also be used for ultrasound detection. We observe a shift of 120~kHz at a resonance frequency of 65~MHz for an induced vibration amplitude of 100~pm with a resolution of 25~pm. Remarkably, the nonlinearity also explains the generally observed asymmetry in the resonance frequency tuning of the resonator when pulled upon with an electrostatic gate. This work puts forward a sensor design that fits onto an atomic force microscope cantilever and therefore promises direct ultrasound detection at the nanoscale for nondestructive subsurface characterization." @default.
- W2863908587 created "2018-07-19" @default.
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- W2863908587 date "2018-07-10" @default.
- W2863908587 modified "2023-09-30" @default.
- W2863908587 title "Detecting Ultrasound Vibrations with Graphene Resonators" @default.
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- W2863908587 doi "https://doi.org/10.1021/acs.nanolett.8b02036" @default.
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