Linear and nonlinear laser-trapping microrheology

C. F. Schmidt, D. Mizuno

研究成果: Chapter in Book/Report/Conference proceedingConference contribution


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.

ホスト出版物のタイトルOptical Trapping and Optical Micromanipulation IV
出版ステータス出版済み - 12 1 2007
イベントOptical Trapping and Optical Micromanipulation IV - San Diego, CA, 米国
継続期間: 8 26 20078 29 2007


名前Proceedings of SPIE - The International Society for Optical Engineering


その他Optical Trapping and Optical Micromanipulation IV
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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