New experimental constraints on non-newtonian forces below 100 μm

We have searched for large deviations from Newtonian gravity by means of a finite-frequency microcantilever-based experiment. Our data eliminate from consideration mechanisms of deviation that posit strengths $\ensuremath{\sim}{10}^{4}$ times Newtonian gravity at length scales of $20\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$. This measurement is 3 orders of magnitude more sensitive than others that provide constraints at similar length scales.