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Non-reciprocal robotic metamaterials

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arxiv 1903.03807 v1 pith:UV5OBTCE submitted 2019-03-09 physics.app-ph

Non-reciprocal robotic metamaterials

classification physics.app-ph
keywords non-reciprocalfrequencieslevelmetamaterialsrobotictransmissionwavesamplification
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Non-reciprocal transmission of motion is potentially highly beneficial to a wide range of applications, ranging from wave guiding, to shock and vibration damping and energy harvesting. To date, large levels of non-reciprocity have been realized using broken spatial or temporal symmetries, yet only in the vicinity of resonances or using nonlinearities, thereby nonreciprocal transmission remains limited to narrow ranges of frequencies or input magnitudes and sensitive to attenuation. Here, we devise a novel type of robotic mechanical metamaterials wherein we use local control loops to break reciprocity at the level of the interactions between the unit cells. We show theoretically that first-of-their-kind asymmetric standing waves at all frequencies and unidirectionally amplified propagating waves emerge. We demonstrate experimentally and numerically that this property leads to tunable, giant, broadband and attenuation-free non-reciprocal performances, namely a level of 50dB non-reciprocal isolation over 3.5 decades in frequency, as well as one-way amplification of pulses.

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