'Wiggler-Waggler': Towards optical measurements of the complex shear modulus

Bennett, James S., Brousse, Emmanuel, Baudisch, Bastian, Preece, Daryl, Nieminen, Timo A., Heckenberg, Norman R. and Rubinsztein-Dunlop, Halina (2011). 'Wiggler-Waggler': Towards optical measurements of the complex shear modulus. In: Proceedings of SPIE: Optical Trapping and Optical Micromanipulation VIII. Optical Trapping and Optical Micromanipulation VIII, San Diego, CA, United States, (809715.1-809715.10). 21 August 2011. doi:10.1117/12.894969

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Author Bennett, James S.
Brousse, Emmanuel
Baudisch, Bastian
Preece, Daryl
Nieminen, Timo A.
Heckenberg, Norman R.
Rubinsztein-Dunlop, Halina
Title of paper 'Wiggler-Waggler': Towards optical measurements of the complex shear modulus
Conference name Optical Trapping and Optical Micromanipulation VIII
Conference location San Diego, CA, United States
Conference dates 21 August 2011
Proceedings title Proceedings of SPIE: Optical Trapping and Optical Micromanipulation VIII   Check publisher's open access policy
Journal name Proceedings of SPIE - The International Society for Optical Engineering   Check publisher's open access policy
Place of Publication Bellingham, WA, United States
Publisher SPIE - International Society for Optical Engineering
Publication Year 2011
Sub-type Fully published paper
DOI 10.1117/12.894969
Open Access Status File (Publisher version)
ISBN 9780819487070
ISSN 0277-786X
Volume 8097
Start page 809715.1
End page 809715.10
Total pages 10
Collection year 2012
Language eng
Abstract/Summary Microrheology, the study of flow at the microscopic scale, has benefited immensely from a variety of optical micromanipulation techniques developed over the past two decades. However, very few present procedures allow the rapid measurement of the viscoelastic properties of fluid samples with volumes on the order of tens of picolitres over a wide frequency range. We detail preliminary construction and analysis of an active rotational microrheological method which promises to achieve this. Rotational microrheology was performed by optically trapping a birefringent probe particle in a linearly polarised dual-beam trap and rapidly rotating the polarisation direction through a xed angle. This provides measurements of the low-frequency fluid response, whilst passive monitoring of thermal motion is used to determine high-frequency components. Our method is less sensitive to boundary effects and probe particle asphericity than analogous translational microrheological techniques, so will be ideal for microfluidic applications and analysis of fluids which are generally available in volumes which preclude the use of existing experimental techniques.
Keyword Optical tweezers
Optical angular momentum
Active microrheology
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article # 809715

Document type: Conference Paper
Collections: School of Mathematics and Physics
Official 2012 Collection
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Created: Thu, 20 Oct 2011, 14:07:21 EST by Mr Daryl Preece on behalf of Physics