Linear and nonlinear laser-trapping microrheology

D. Mizuno

doi:10.1117/12.739441

5 September 2007 Linear and nonlinear laser-trapping microrheology

D. Mizuno

Proceedings Volume 6644, Optical Trapping and Optical Micromanipulation IV; 66440L (2007) https://doi.org/10.1117/12.739441
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

We have developed a high-bandwidth technique for active 2-particle microrheology (AMR) with which we can probe linear and nonlinear responses of soft materials. Micron-sized colloidal probe particles are driven by an oscillating optical trap, and the resulting correlated motions of neighboring particles are detected by laser interferometry. Lock-in detection at the driving frequency and at its second harmonic makes it possible to measure the linear and the non-linear response of the embedding medium at the same time. We demonstrate the sensitivity of the method by detecting a second-harmonic response in water which is of purely geometric origin and which can be fully understood within linear hydrodynamics.

Citation Download Citation

D. Mizuno "Linear and nonlinear laser-trapping microrheology", Proc. SPIE 6644, Optical Trapping and Optical Micromanipulation IV, 66440L (5 September 2007); https://doi.org/10.1117/12.739441

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