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Publication Detail
Ultrasensitive plano-concave optical microresonators for ultrasound sensing
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Guggenheim JA, Li J, Allen TJ, Colchester RJ, Noimark S, Ogunlade O, Parkin IP, Papakonstantinou I, Desjardins AE, Zhang EZ, Beard PC
  • Publication date:
    01/11/2017
  • Pagination:
    714, 719
  • Journal:
    Nature Photonics
  • Volume:
    11
  • Issue:
    11
  • Status:
    Published
  • Print ISSN:
    1749-4885
Abstract
© 2017 The Author(s). 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 > 10 5 ) 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.
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