Evading surface and detector frequency noise in harmonic oscillator measurements of force gradients

Moore, Eric W.; SangGap Lee; Hickman, Steven A.; Harrell, Lee E.; Marohn, John A.
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p044105
Academic Journal
We introduce and demonstrate a method of measuring small force gradients acting on a harmonic oscillator in which the force-gradient signal of interest is used to parametrically up-convert a forced oscillation below resonance into an amplitude signal at the oscillator’s resonance frequency. The approach, which we demonstrate in a mechanically detected electron spin resonance experiment, allows the force-gradient signal to evade detector frequency noise by converting a slowly modulated frequency signal into an amplitude signal.


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