Lateral Resolution and Signal to Noise Ratio in Electrostatic Force Detection Based on Scanning Probe Microscopy
ZHANG Dong-Dong1,2, WANG Xiao-Wei1, WANG Rui1,2, WANG Sheng-Nan1,3, CHENG Zhi-Hai1, QIU Xiao-Hui1**
1National Center for Nanoscience and Technology, Zhongguancun, Beijing 100190 2Academy of Advanced Interdisciplinary Studies, Peking University, Beijing 100871 3Department of Physics, Tsinghua University, Beijing 100084
Lateral Resolution and Signal to Noise Ratio in Electrostatic Force Detection Based on Scanning Probe Microscopy
ZHANG Dong-Dong1,2, WANG Xiao-Wei1, WANG Rui1,2, WANG Sheng-Nan1,3, CHENG Zhi-Hai1, QIU Xiao-Hui1**
1National Center for Nanoscience and Technology, Zhongguancun, Beijing 100190 2Academy of Advanced Interdisciplinary Studies, Peking University, Beijing 100871 3Department of Physics, Tsinghua University, Beijing 100084
摘要The lateral resolution (LR) and signal-to-noise ratio (SNR) are the essential factors in the applications of scanning probe microscopy in quantitative measurement of surface charge distribution, potential profile, and dielectric properties. We use a model system to comprise Au nanoparticles (NPs) embedded in a polystyrene (PS) matrix to study the effects of various experimental parameters, such as modulation bias voltage, tip-sample distance, and actual tip shape, on the electrostatic interactions between the tips and samples. The results show that LR and SNR decrease when the tip-sample distance increases, while SNR increases with tip modulation voltage. LR is less sensitive to tip modulation voltage, but shows complex dependence on the sample geometric structure. In combination with a numerical simulation based on the integral capacitance model, the electrostatic force interaction between tip and sample was quantitatively analyzed.
Abstract：The lateral resolution (LR) and signal-to-noise ratio (SNR) are the essential factors in the applications of scanning probe microscopy in quantitative measurement of surface charge distribution, potential profile, and dielectric properties. We use a model system to comprise Au nanoparticles (NPs) embedded in a polystyrene (PS) matrix to study the effects of various experimental parameters, such as modulation bias voltage, tip-sample distance, and actual tip shape, on the electrostatic interactions between the tips and samples. The results show that LR and SNR decrease when the tip-sample distance increases, while SNR increases with tip modulation voltage. LR is less sensitive to tip modulation voltage, but shows complex dependence on the sample geometric structure. In combination with a numerical simulation based on the integral capacitance model, the electrostatic force interaction between tip and sample was quantitatively analyzed.
ZHANG Dong-Dong, WANG Xiao-Wei, WANG Rui, WANG Sheng-Nan, CHENG Zhi-Hai, QIU Xiao-Hui. Lateral Resolution and Signal to Noise Ratio in Electrostatic Force Detection Based on Scanning Probe Microscopy[J]. 中国物理快报, 2012, 29(7): 70703-070703.
ZHANG Dong-Dong, WANG Xiao-Wei, WANG Rui, WANG Sheng-Nan, CHENG Zhi-Hai, QIU Xiao-Hui. Lateral Resolution and Signal to Noise Ratio in Electrostatic Force Detection Based on Scanning Probe Microscopy. Chin. Phys. Lett., 2012, 29(7): 70703-070703.
2012, Vol. 29 
