Phonon imaging in 3D with a fibre probe.

Phonon imaging in 3D with a fibre probe.
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用纤维探针在3D中成像。

DOI:
10.1038/s41377-021-00532-7
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发表时间:
2021-04-27
期刊:
Light, science & applications
影响因子:
--
通讯作者:
Clark M
Clark M
中科院分区:
其他
文献类型:
--
作者:
La Cavera S 3rd;Pérez-Cota F;Smith RJ;Clark M

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我们首次展示了单个超声成像光纤能够同时访问微观物体的3D空间信息和机械特性。这种新型的测量系统由两个超快激光器组成,它们可以激发和检测来自纳米传感器的高频超声,该传感器被制造在单模光纤的尖端上。还开发了一种信号处理技术,以从GHz频率声波中提取纳米深度空间测量,同时仍允许频域中的布里渊光谱。在各种聚合物微结构上证明了无标记和非接触成像性能。该装置的光学横向分辨率为2.5 μm,声学深度测量精度为45 nm。通过将单个纤维外推到成像束中的数万根纤维,展示了该设备的内窥镜潜力。这样的装置催化了未来的声子显微内镜技术,该技术使无标记体内组织学的前景触手可及。
We show for the first time that a single ultrasonic imaging fibre is capable of simultaneously accessing 3D spatial information and mechanical properties from microscopic objects. The novel measurement system consists of two ultrafast lasers that excite and detect high-frequency ultrasound from a nano-transducer that was fabricated onto the tip of a single-mode optical fibre. A signal processing technique was also developed to extract nanometric in-depth spatial measurements from GHz frequency acoustic waves, while still allowing Brillouin spectroscopy in the frequency domain. Label-free and non-contact imaging performance was demonstrated on various polymer microstructures. This singular device is equipped with optical lateral resolution, 2.5 μm, and a depth-profiling precision of 45 nm provided by acoustics. The endoscopic potential for this device is exhibited by extrapolating the single fibre to tens of thousands of fibres in an imaging bundle. Such a device catalyses future phonon endomicroscopy technology that brings the prospect of label-free in vivo histology within reach.
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