Nonlinear mechanical oscillators are increasingly found in devices ranging from signal processors to high-precision accelerometers. Typically, such oscillators can only resonate at frequencies of up to a few MHz; at higher frequencies, their structures are too stiff to vibrate properly, and they produce linear, rather than nonlinear, responses to stimuli. Now, Xu Han and his colleagues at Yale University have made a nonlinear oscillator that works at GHz frequencies [1].
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