标题： 通用矢量和超灵敏纳米机械力场传感器 显示英文标题

标题： Universal Vectorial and Ultrasensitive Nanomechanical Force Field Sensor

摘要： 将力探针微型化为纳米机械振荡器，使得在小于其特征长度尺度的尺寸上对力进行超灵敏研究成为可能。 同时，它也揭示了力场的矢量特性及其拓扑结构如何影响测量。 在这里，我们介绍了一种超灵敏的方法，通过光机跟踪单端夹紧纳米线的二维布朗运动来成像二维矢量力场。 这种方法依赖于其准频率简并的横向机械极化的角度和频谱断层扫描：将纳米谐振器浸入矢量力场中不仅会改变其本征频率，还会旋转本征模态的方向，如同一个纳米指南针。 这种通用方法被用于绘制可调节的静电力场，其空间梯度甚至可以超越纳米线的固有特性。 在纳米探针的布朗轨迹上实现阿托牛变化的演示灵敏度，将对纳米尺度上的科学探索产生重大影响。 显示英文摘要

摘要： Miniaturization of force probes into nanomechanical oscillators enables ultrasensitive investigations of forces on dimensions smaller than their characteristic length scale. Meanwhile it also unravels the force field vectorial character and how its topology impacts the measurement. Here we expose an ultrasensitive method to image 2D vectorial force fields by optomechanically following the bidimensional Brownian motion of a singly clamped nanowire. This novel approach relies on angular and spectral tomography of its quasi frequency-degenerated transverse mechanical polarizations: immersing the nanoresonator in a vectorial force field does not only shift its eigenfrequencies but also rotate eigenmodes orientation as a nano-compass. This universal method is employed to map a tunable electrostatic force field whose spatial gradients can even take precedence over the intrinsic nanowire properties. Enabling vectorial force fields imaging with demonstrated sensitivities of attonewton variations over the nanoprobe Brownian trajectory will have strong impact on scientific exploration at the nanoscale.