Comparing acoustic and optical forces for biomedical research

A Publisher Correction to this article was published on 21 August 2020

This article has been updated

Abstract

The application of acoustic and optical waves to exert non-contact forces on microscopic and mesoscopic objects has grown considerably in importance in the past few decades. Different physical principles govern the acoustic and optical forces, leading to diverse biomedical applications. Biocompatibility is crucial, and useful optical and acoustic forces can be applied in devices that maintain local heating to acceptable levels. Current acoustic and optical devices work on complementary length scales, with both modalities having useful capabilities at the scale of the cell. Optical devices also cover subcellular scales and acoustic devices also cover supercellular scales. This complementarity has led to the emergence of multimode manipulation, often with integrated imaging. In this Technical Review, we provide an overview of optical and acoustic forces, before comparing and contrasting the use of these modalities, or combinations thereof, in terms of sample manipulation and suitability for biomedical studies. We conclude with our perspective on the applications in which we expect to see notable developments in the near future.

Key points

  • Acoustic and optical forces are governed by different physical principles, but both enable the application of non-contact forces to biomedically important objects such as cells and microorganisms.

  • Acoustic and optical forces in the piconewton to nanonewton range can be applied to a typical cell, with optical devices having capabilities extending below this scale and acoustic devices above.

  • Biocompatibility cannot be assumed as both modalities can produce local heating; however, careful device design has led to many examples of biocompatible devices.

  • Biomedical applications of optical and acoustic devices are rapidly increasing and include manipulation, patterning and mechanical probing, often combined with imaging.

  • The number of applications is expected to increase, and we anticipate more examples of multimode or hybrid devices to emerge, increasingly sophisticated integration of imaging, and the development of more versatile and fully reconfigurable manipulation systems.

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Fig. 1: Optical and acoustic trapping fields.
Fig. 2: Forces in optical tweezers.
Fig. 3: Acoustic forces.
Fig. 4: Acoustic and optical trapping regimes.

Change history

  • 21 August 2020

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Acknowledgements

K.D. thanks the UK Engineering and Physical Sciences Research Council for funding (grant number EP/P030017/1). B.W.D. gratefully acknowledges funding from the Wolfson Foundation and the Royal Society. M.R.-M. gratefully acknowledges support from the Austrian Science Fund FWF (SFB-project F6806-N36) and helpful discussions with G. Thalhammer and M. Kvåle Løvmo. The authors thank G. Bruce and P. Poulton for assistance with the figures.

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The authors contributed equally to all aspects of the article.

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Correspondence to Monika Ritsch-Marte.

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Nature Reviews Physics thanks H. Rubinsztein-Dunlop, T. J. Huang and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Dholakia, K., Drinkwater, B.W. & Ritsch-Marte, M. Comparing acoustic and optical forces for biomedical research. Nat Rev Phys 2, 480–491 (2020). https://doi.org/10.1038/s42254-020-0215-3

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