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• W2804118056 abstract "Q-control technique enables to actively change the quality factor of the probe oscillation in dynamic atomic force microscopy. The Q-control is realized by adding a self-feedback loop into the original actuation-detection system, in which a damping force with controllable damping coefficient in magnitude and sign is applied to the oscillating probe. While the applied force alters the total damping interaction and thus the overall ‘signal’ of the probe motion, the added feedback system changes the ‘noise’ of the motion as well. Here, we systematically investigate the signal, the noise, and the signal-to-noise ratio of the qPlus sensor under the active Q-control. We quantify the noise of the qPlus motion by measuring the noise spectral density, which is reproduced by a harmonic oscillator model including the thermal and the measurement noises. We show that the noise signal increases with the quality factor controlled, scaling as the square root of the quality factor. Because the overall signal is linearly proportional to the quality factor, the signal-to-noise ratio scales as the square root of the quality factor. The Q-controlled qPlus with a highly enhanced Q, up to 10,000 in air, leads to the minimum detectable force gradient of 0.001 N/m, which would enhance the capability of the qPlus sensor for atomic force microscopy and spectroscopy." @default.
• W2804118056 created "2018-06-01" @default.
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• W2804118056 date "2018-05-01" @default.
• W2804118056 modified "2023-10-07" @default.
• W2804118056 title "Evaluating signal and noise spectral density of a qPlus sensor with an active feedback control" @default.
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• W2804118056 doi "https://doi.org/10.1063/1.5028215" @default.
• W2804118056 hasPublicationYear "2018" @default.
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