- Title
- Higher-harmonic AFM imaging with a high-bandwidth multifrequency Lyapunov filter
- Creator
- Harcombe, David M.; Ruppert, Michael G.; Ragazzon, Michael R. P.; Fleming, Andrew J.
- Relation
- 2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM). Proceedings of the 2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM) (Munich, Germany 3-7 July, 2017) p. 725-730
- Publisher Link
- http://dx.doi.org/10.1109/AIM.2017.8014103
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Resource Type
- conference paper
- Date
- 2017
- Description
- A major difficulty in multifrequency atomic force microscopy (MF-AFM) is the accurate estimation of amplitude and phase at multiple frequencies for both z-axis feedback and material contrast imaging. A lock-in amplifier is typically chosen for its narrowband response and ease of implementation. However, its bandwidth is limited due to post mixing lowpass filters and multiple are required in parallel for MF-AFM. This paper proposes a multifrequency demodulator in the form of a model-based Lyapunov filter implemented on a Field Programmable Gate Array (FPGA). System modelling and simulations are verified by experimental results demonstrating high tracking bandwidth and off-mode rejection at modelled frequencies. Additionally, AFM scans with a five-frequencybased system are presented wherein higher harmonic imaging is performed up to 1 MHz.
- Subject
- design/control of MEMS-nano devices; micro-electro-mechanical systems; applications of nano technology
- Identifier
- http://hdl.handle.net/1959.13/1395312
- Identifier
- uon:33848
- Identifier
- ISBN:9781509059980
- Language
- eng
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