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Low Latency Demodulation for High-Frequency Atomic Force Microscopy Probes

Denis Lagrange 1 Nicolas Mauran 1 Lucien Schwab 2 Bernard Legrand 2
1 LAAS-I2C - Service Instrumentation Conception Caractérisation
LAAS - Laboratoire d'analyse et d'architecture des systèmes
2 LAAS-MEMS - Équipe Microsystèmes électromécaniques
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : One prerequisite for high-speed imaging in dynamic-mode atomic force microscopy (AFM) is the fast demod-ulation of the probe signal. In this contribution, we present the amplitude and phase estimation method based on the acquisition of four points per oscillation, with the sampling frequency being phase-locked on the probe actuation. The method is implemented on a RedPitaya platform, with its clock being generated from the actuation signal of the probe. Experimental characterizations using square-modulated sine waves show that latency of 500 ns is achieved with a carrier frequency of 10 MHz, which is ten times faster compared with a state-of-the-art lock-in amplifier. A tracking bandwidth greater than 200 kHz is obtained experimentally. The method is eventually applied to a close-loop AFM scan realized using a 15-MHz AFM probe, showing its suitability for high-frequency oscillating probes. Index Terms-Amplitude and phase demodulation, atomic force microscopy (AFM), field-programmable gate array (FPGA) implementation.
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Submitted on : Wednesday, October 21, 2020 - 3:58:46 PM
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Denis Lagrange, Nicolas Mauran, Lucien Schwab, Bernard Legrand. Low Latency Demodulation for High-Frequency Atomic Force Microscopy Probes. IEEE Transactions on Control Systems Technology, Institute of Electrical and Electronics Engineers, inPress, ⟨10.1109/TCST.2020.3028737⟩. ⟨hal-02974151⟩



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