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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2924902 | PMC |
| http://dx.doi.org/10.1063/1.3465906 | DOI Listing |
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