Parallel-Plate Test of Gravity At Sub-Millimeter Distances

Gravity has not been experimentally observed at scales smaller than the diameter of human hair, barely smaller than the dark energy length-scale of 85 microns. Our sensitive ($10^{-14}$ N-m/$\sqrt{\mbox{Hz}}$) torsion balance uses a parallel-plate mass configuration to maximize signal and to create a Gauss's Law null-test of short range gravity. The measurement's sensitivity is comparable to the existing best limits at $\sim56$ microns, but with complimentary sources of systematic uncertainty. The talk will highlight our approach to systematic uncertainty and data analysis.