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用于超声波检测的亚微米在绝缘体上的共振器
Rami Shnaiderman1,2, Georg Wissmeyer3,4, Okan Ülgen3,4
1Chair of Biological Imaging and TranslaTUM, Technische Universität München, Munich, Germany. rami.shnaiderman@tum.de.
Nature
|September 17, 2020
概括
研究人员开发了一种新的超微型超声波探测器, 这一突破使得超高分辨率的超声波成像具有前所未有的灵敏度和带宽,为先进的医学诊断铺平了道路.
科学领域:
- 材料科学
- 生物医学工程
- 光学学
背景情况:
- 超声波成像分辨率受到探测器尺寸的限制.
- 现有的探测器,如压电和光学共振器,面临小型化挑战.
- 目前的方法在较小的尺度上难以获得灵敏度和带宽.
研究的目的:
- 开发出一种新的微型超声波探测器,
- 克服当前超声波检测技术的局限性.
- 为了实现超分辨率超声波成像和密集的阵列应用.
主要方法:
- 用于检测器制造的在绝缘体 (SOI) 技术.
- 设计了一种具有亚微米传感面积 (220 nm x 500 nm) 的光学共振器.
- 检测器的灵敏度,带宽和成像性能.
主要成果:
- 每个区域的灵敏度比微环共振器高1000倍,比压电探测器好10亿倍.
- 证明了 230 MHz (-6 dB) 的超宽检测带宽.
- 能够对比超声波长小50倍的物体进行超高分辨率成像.
结论:
- 基于SOI的光学共振器提供了超微型超声波探测器的途径.
- 这项技术使得超声波成像分辨率与光学显微镜相提并论.
- 在芯片上开发高密度超声波阵列的潜力.
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