Enhancing the optical lever sensitivity of microcantilevers for dynamic atomic force microscopy via integrated low frequency paddles

2016 ◽  
Vol 27 (19) ◽  
pp. 195502 ◽  
Author(s):  
Nurul Huda Shaik ◽  
Ronald G Reifenberger ◽  
Arvind Raman
Keyword(s):  
Atomic Force Microscopy ◽  
Low Frequency ◽  
Force Microscopy ◽  
Atomic Force ◽  
Optical Lever

scholarly journals Improved atomic force microscopy cantilever performance by partial reflective coating

2015 ◽  
Vol 6 ◽  
pp. 1450-1456 ◽  
Author(s):  
Zeno Schumacher ◽  
Yoichi Miyahara ◽  
Laure Aeschimann ◽  
Peter Grütter
Keyword(s):  
Atomic Force Microscopy ◽  
High Vacuum ◽  
Low Frequency ◽  
Beam Deflection ◽  
High Signal ◽  
Dynamic Mode ◽  
Contact Mode ◽  
Force Microscopy ◽  
Reflective Coating ◽  
Atomic Force

Optical beam deflection systems are widely used in cantilever based atomic force microscopy (AFM). Most commercial cantilevers have a reflective metal coating on the detector side to increase the reflectivity in order to achieve a high signal on the photodiode. Although the reflective coating is usually much thinner than the cantilever, it can still significantly contribute to the damping of the cantilever, leading to a lower mechanical quality factor (Q-factor). In dynamic mode operation in high vacuum, a cantilever with a high Q-factor is desired in order to achieve a lower minimal detectable force. The reflective coating can also increase the low-frequency force noise. In contact mode and force spectroscopy, a cantilever with minimal low-frequency force noise is desirable. We present a study on cantilevers with a partial reflective coating on the detector side. For this study, soft (≈0.01 N/m) and stiff (≈28 N/m) rectangular cantilevers were used with a custom partial coating at the tip end of the cantilever. The Q-factor, the detection and the force noise of fully coated, partially coated and uncoated cantilevers are compared and force distance curves are shown. Our results show an improvement in low-frequency force noise and increased Q-factor for the partially coated cantilevers compared to fully coated ones while maintaining the same reflectivity, therefore making it possible to combine the best of both worlds.

Metasurface-enhanced optical lever sensitivity for atomic force microscopy

2019 ◽  
Vol 30 (36) ◽  
pp. 365501 ◽  
Author(s):  
Zan Yao ◽  
Xicheng Xia ◽  
Yaoping Hou ◽  
Peng Zhang ◽  
Xiaomin Zhai ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Optical Lever
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