Evading surface and detector frequency noise in harmonic oscillator measurements of force gradients.
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.
Moore
Eric W
EW
Lee
Sanggap
S
Hickman
Steven A
SA
Harrell
Lee E
LE
Marohn
John A
JA