title: Ultrasensitive hysteretic force sensing with parametric nonlinear oscillators.
abstract: We propose a method for linear detection of weak forces using parametrically driven nonlinear resonators. The method is based on a peculiar feature in the response of the resonator to a near resonant periodic external force. This feature stems from a complex interplay among the parametric drive, external force, and nonlinearities. For weak parametric drive, the response exhibits the standard Duffing-like single jump hysteresis. For stronger drive amplitudes, we find a qualitatively new double jump hysteresis which arises from stable solutions generated by the cubic Duffing nonlinearity. The additional jump exists only if the external force is present and the frequency at which it occurs depends linearly on the amplitude of the external force, permitting a straightforward ultrasensitive detection of weak forces. With state-of-the-art nanomechanical resonators, our scheme should permit force detection in the attonewton range.
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: Luca
authors.initials: L
authors.lastname: Papariello
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: Oded
authors.initials: O
authors.lastname: Zilberberg
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: Alexander
authors.initials: A
authors.lastname: Eichler
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Chitra