Abstract
Dynamic mode operation of Atomic Force Microscopes relies on demodulation schemes to get information from different flexure modes of the cantilever while imaging a sample. In the article, we demonstrate that the conventional approach of discerning higher mode participation via amplitude and phase demodulation is not suitable for high bandwidth applications. Furthermore, we provide a method where the higher mode participation is reconstructed with high fidelity, and present a scheme for high bandwidth detection of higher modes when their participation becomes significant. These methods are shown to outperform the traditional amplitude-phase demodulation schemes in terms of speed, resolution, and fidelity. The framework developed is tested on simulations and the method's utility for first two modes is demonstrated experimentally.
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