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By Simon F. Tolić-Nørrelykke, Erik Schäffer, Jonathon Howard, Francesco S. Pavone, Frank Jülicher, Henrik Flyvbjerg.

Online text: arxiv.org/abs/physics/0603037

Cited passages: Simon F. Tolić-Nørrelykke et al., Calibration of optical tweezers with positional detection in the back-focal-plane (2006), abstract: combined thermal-spectrum and stage-driven calibration.

Frank Jülicher coauthored a calibration method for optical tweezers that combines the trapped particle's thermal fluctuations with its response to a controlled sinusoidal motion. These two measurements determine position and force scales without taking the particle's drag coefficient as an independently known input. The experiment tested the method both near and far from surfaces. Its physical advantage is to separate detector calibration from uncertain particle size, viscosity and wall-dependent drag.^[ref]