Abstract
In this paper, we introduce a lock-in amplifier for the dynamic mode operation of atomic force microscopy, based on the optical pickup unit of a DVD. We fabricated a lock-in amplifier, which is fundamentally based on the principle of the dual phase mode, and included an additional enhancement structure to ensure high bandwidth, so that it is capable of supporting high-speed scanning probe microcopy in the future. We performed a basic experiment for performance evaluation and dynamic mode imaging of a standard sample by applying the fabricated lock-in amplifier module to a pre-developed optical pickup unit based atomic force microscopy.
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