@article { ISI:000377021200009,
	title = {Subfemtonewton Force Spectroscopy at the Thermal Limit in Liquids},
	journal = {PHYSICAL REVIEW LETTERS},
	volume = {116},
	number = {22},
	year = {2016},
	month = {JUN 3},
	publisher = {AMER PHYSICAL SOC},
	type = {Article},
	address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
	abstract = {We demonstrate thermally limited force spectroscopy using a probe formed by a dielectric microsphere optically trapped in water near a dielectric surface. We achieve force resolution below 1 fN in 100 s, corresponding to a 2 angstrom rms displacement of the probe. Our measurement combines a calibrated evanescent wave particle tracking technique and a lock-in detection method. We demonstrate the accuracy of our method by measurement of the height-dependent force exerted on the probe by an evanescent wave, the results of which are in agreement with Mie theory calculations.},
	issn = {0031-9007},
	doi = {10.1103/PhysRevLett.116.228001},
	author = {Liu, Lulu and Kheifets, Simon and Ginis, Vincent and Federico Capasso}
}
