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Ultrasensitive plano-concave optical microresonators for ultrasound sensing

Guggenheim, JA; Li, J; Allen, TJ; Colchester, RJ; Noimark, S; Ogunlade, O; Parkin, IP; ... Beard, PC; + view all (2017) Ultrasensitive plano-concave optical microresonators for ultrasound sensing. Nature Photonics , 11 pp. 714-719. 10.1038/s41566-017-0027-x. Green open access

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Abstract

Highly sensitive broadband ultrasound detectors are needed to expand the capabilities of biomedical ultrasound, photoacoustic imaging and industrial ultrasonic non-destructive testing techniques. Here, a generic optical ultrasound sensing concept based on a novel plano-concave polymer microresonator is described. This achieves strong optical confinement (Q-factors > 105) resulting in very high sensitivity with excellent broadband acoustic frequency response and wide directivity. The concept is highly scalable in terms of bandwidth and sensitivity. To illustrate this, a family of microresonator sensors with broadband acoustic responses up to 40 MHz and noise-equivalent pressures as low as 1.6 mPa per √Hz have been fabricated and comprehensively characterized in terms of their acoustic performance. In addition, their practical application to high-resolution photoacoustic and ultrasound imaging is demonstrated. The favourable acoustic performance and design flexibility of the technology offers new opportunities to advance biomedical and industrial ultrasound-based techniques.

Type: Article
Title: Ultrasensitive plano-concave optical microresonators for ultrasound sensing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41566-017-0027-x
Publisher version: http://dx.doi.org/10.1038/s41566-017-0027-x
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Optics, Physics, Applied, Physics, Resolution Photoacoustic Microscopy, Tomography, Sensor, Sensitivity, Detector
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
URI: http://discovery.ucl.ac.uk/id/eprint/10046784
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