Mechanical sensors provide core keys for high-end research in quantitative understanding\nof fundamental phenomena and practical applications such as the force or pressure sensor,\naccelerometer and gyroscope. In particular, in situ sensitive and reliable detection is essential for\nmeasurements of the mechanical vibration and displacement forces in inertial sensors or seismometers.\nHowever, enhancing sensitivity, reducing response time and equipping sensors with a measurement\ncapability of bidirectional mechanical perturbations remains challenging. Here, we demonstrate the\nbuckling cantilever-based non-linear dynamic mechanical sensor which addresses intrinsic limitations\nassociated with high sensitivity, reliability and durability. The cantilever is attached on to a high-Q\ntuning fork and initially buckled by being pressed against a solid surface while a flexural stress\nis applied. Then, buckling instability occurs near the bifurcation region due to lateral movement,\nwhich allows high-sensitive detection of the lateral and perpendicular surface acoustic waves with\nbandwidth-limited temporal response of less than 1 ms.
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