He Fei, Liu Jian, Zhu Ka-Di
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, People's Republic of China.
Nanotechnology. 2021 Feb 19;32(8):085505. doi: 10.1088/1361-6528/abc711.
In the scanning probe microscope system, the weak signal detection of cantilever vibration is one of the important factors affecting the sensor sensitivity. In our current work, we present a novel design concept for an atomic force microscope (AFM) combined with optomechanics with an ultra-high quality factor and a low thermal noise. The detection system consists of a fixed mirror placed on the cantilever of the AFM and pump-probe beams that is equivalent to a Fabry-Perot cavity. We realize that the AFM combined with an optical cavity can achieve ultra-sensitive detection of force gradients of 10 N m in the case of high-vacuum and low effective temperature of 1 mK, which may open up new avenues for super-high resolution imaging and super-high precision force spectroscopy.
在扫描探针显微镜系统中，悬臂振动的微弱信号检测是影响传感器灵敏度的重要因素之一。在我们目前的工作中，我们提出了一种结合了具有超高品质因数和低热噪声的光力学的原子力显微镜（AFM）的新颖设计概念。检测系统由放置在AFM悬臂上的固定镜和等效于法布里-珀罗腔的泵浦-探测光束组成。我们认识到，在高真空和1 mK的低有效温度情况下，结合光学腔的AFM可以实现10 N/m的力梯度的超灵敏检测，这可能为超高分辨率成像和超高精度力谱开辟新途径。
