A universal and ultrasensitive vectorial nanomechanical sensor for imaging 2D force fields
A universal and ultrasensitive vectorial nanomechanical sensor for imaging 2D force fields
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DOI：
10.1038/nnano.2016.193
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发表时间：
2017-02-01
影响因子：
38.3
通讯作者：
Arcizet, Olivier
中科院分区：
文献类型：
--
作者：
de Lepinay, Laure Mercier;Pigeau, Benjamin;Arcizet, Olivier
力探头进入纳米机械振荡器的小型化使得能够超灵敏地研究尺寸小于其特征长度尺度的力。它还揭示了力场的矢量特征及其拓扑结构对测量的影响。在这里，我们提出了一种超灵敏的方法，通过光学机械跟踪单夹持纳米线的二维布朗运动来成像二维矢量场。这种方法依赖于准频率简并的横向机械极化的角度和光谱层析成像：将纳米谐振器浸入矢量力场中不仅会改变其本征频率，还会旋转本征模的方向，就像纳米指南针一样。这种普遍的方法被用来映射一个可调的静电场，其空间梯度甚至可以支配纳米线的本征性质。使矢量力场成像具有在纳米探测器布朗轨迹上显示的属性新闻变化的敏感性，将对纳米尺度的科学探索产生强烈的影响。
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.