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photons and biomolecules. The structures and principles of DND device have been inspired from those of the biological muscle actuator.The bio-inspired DND, composed of a digital actuator and a nonlinear mechanical modulator, puries the stroke of the digital actuatorin order to generate the high-precision motion required for nano-positioning of photonic or bio-molecule devices. We design and fab-ricate two kind of DNDs: one with a linear modulator (l-DND) and the other with nonlinear modulator (n-DND), both having an iden-tical input and output strokes of 15.2l m and 5.4l m, respectively. In experimental study, n-DND shows the repeatability of12.3 ± 2.9 nm, superior to that of 27.8 ± 2.9 nm achieved by l-DND. We experimentally verify that the displacement purifying capabilityof the bio-inspired n-DND achieves nano-precision motion repeatability, applicable to photon and bio-molecule manipulation.