A universal and ultrasensitive vectorial nanomechanical sensor for imaging 2D force fields

Laure Mercier De Lépinay, Benjamin Pigeau, Benjamin Besga, Pascal Vincent, Philippe Poncharal, Olivier Arcizet*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

94 Citations (Scopus)

Abstract

The miniaturization of force probes into nanomechanical oscillators enables ultrasensitive investigations of forces on dimensions smaller than their characteristic length scales. It also unravels the vectorial character of the force field and how its topology impacts the measurement. Here we present an ultrasensitive method for imaging two-dimensional vectorial force fields by optomechanically following the bidimensional Brownian motion of a singly clamped nanowire. This approach relies on angular and spectral tomography of its quasi-frequency-degenerated transverse mechanical polarizations: immersing the nanoresonator in a vectorial force field not only shifts its eigenfrequencies but also rotates the orientation of the eigenmodes, as a nanocompass. This universal method is employed to map a tunable electrostatic force field whose spatial gradients can even dominate the intrinsic nanowire properties. Enabling vectorial force field imaging with demonstrated sensitivities of attonewton variations over the nanoprobe Brownian trajectory will have a strong impact on scientific exploration at the nanoscale.

Original languageEnglish
Pages (from-to)156-162
Number of pages7
JournalNature Nanotechnology
Volume12
Issue number2
DOIs
Publication statusPublished - 7 Feb 2017
MoE publication typeA1 Journal article-refereed

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