Ultrasensitive plano-concave optical microresonators for ultrasound sensing
Ultrasensitive plano-concave optical microresonators for ultrasound sensing
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DOI：
10.1038/s41566-017-0027-x
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发表时间：
2017-11-01
期刊：
影响因子：
35
通讯作者：
Beard, Paul C.
中科院分区：
文献类型：
--
作者：
Guggenheim, James A.;Li, Jing;Beard, Paul C.
为了扩大生物医学超声、光声成像和工业超声无损检测技术的能力，需要高灵敏度的宽带超声探测器。本文描述了一种基于新型平凹聚合物微谐振器的通用光学超声传感概念。这实现了强光约束（q因子bbb10(5)），从而具有非常高的灵敏度，具有出色的宽带声频率响应和宽指向性。该概念在带宽和灵敏度方面具有高度可扩展性。为了说明这一点，已经制造了一系列具有高达40 MHz的宽带声响应和低至1.6 mPa /根Hz的噪声等效压力的微谐振器传感器，并对其声学性能进行了全面表征。此外，还展示了它们在高分辨率光声和超声成像中的实际应用。该技术良好的声学性能和设计灵活性为推进生物医学和工业超声技术提供了新的机会。
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 root 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.