title: Supercontinuum trap stiffness measurement using a confocal approach.
abstract: We report a novel method for characterizing the stiffness of white light supercontinuum tweezers, in which the nonlinear photonic crystal fiber used for supercontinuum generation is also utilized as an effective confocal pinhole to track the motion of a trapped bead and as a scan head to realize rapid scanning of the optical trap. By measuring the phase of the bead's motion in following the trap, a lateral stiffness value of about 7.9 μN/m was obtained with supercontinumm power of about 75 mW. Our technique can potentially allow for trap stiffness calibration along an arbitrary direction in three dimensions.
authors.affiliation: Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhang
authors.forename: Haifeng
authors.initials: H
authors.lastname: Li
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Kebin
authors.initials: K
authors.lastname: Shi
authors.forename: Perry
authors.initials: P
authors.lastname: Edwards
authors.forename: Fiorenzo
authors.initials: F
authors.lastname: Omenetto
authors.forename: Mark
authors.initials: M
authors.lastname: Cronin-Golomb
authors.forename: Guizhong
authors.initials: G
authors.lastname: Zhang
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000465:Algorithms; D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D018613:Microscopy, Confocal / Q000295:instrumentation* / Q000379:methods*; D052898:Optical Tweezers