Nanoscale imaging with picosecond ultrasonic computed tomography

皮秒超声计算机断层扫描纳米级成像

• 批准号: 16F16063
• 负责人: O・B Wright
• 金额: $ 1.47万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2016
• 资助国家: 日本
• 起止时间: 2016-04-22 至 2018-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16F16063/
• 关键词: Computed tomography; Picosecond ultrasonics; Nanoscale; Imaging

The chosen sample for GHz CT testing is a glass fibre containing two holes along the main axis of its cylinder. Our approach is to excite acoustic waves from one side of the sample and to rotate the probe beam on the opposite side to evaluate the propagated acoustic field for various angles (with a fixed pump excitation spot). Then the fibre is rotated along its axis and the operation is repeated.We realised 3D time-domain acoustic simulations using PZFLex software in a similar geometry. The simulated silica fibre is 5 μm diameter. The two axial air holes of diameter around 1 μm are considered to be vacuum so that no acoustic wave can propagate. This allowed us to demonstrate the detection of both holes with their correct position and also get an estimate of the hole size and shape.The experimental setup was developed to match the particular needs of controlling probe and sample orientations. The setup has been validated on flat glass, and experiments are still ongoing in order to detect the acoustic signal and experimentally demonstrate acoustic computed tomography down to sub-micrometre scale.

选择用于GHz CT测试的样品是沿其圆柱体主轴方向含有两个孔的玻璃纤维。我们的方法是从样品的一侧激发声波，并在另一侧旋转探针束，以评估不同角度的传播声场（具有固定的泵浦激励点）。然后纤维沿着其轴线旋转，重复操作。我们使用PZFLex软件在类似的几何形状中实现了3D时域声学模拟。模拟的硅纤维直径为5 μm。两个直径约为1 μm的轴向气孔被认为是真空的，因此声波无法传播。这使我们能够以正确的位置演示两个孔的检测，并获得孔的大小和形状的估计。该实验装置是为了满足控制探针和样品取向的特殊需要而开发的。该装置已在平板玻璃上进行了验证，实验仍在进行中，目的是检测声信号，并在实验中演示亚微米尺度的声学计算机断层扫描。

项目成果

Active chiral control of GHz acoustic whispering-gallery modes

• DOI: 10.1063/1.4994886
• 发表时间: 2017-10
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: S. Mezil;K. Fujita;P. Otsuka;M. Tomoda;M. Clark;O. Wright;O. Matsuda

Tuning to a particular acoustic whispering-gallery mode in the GHz range

• DOI: 10.1121/1.4970080
• 发表时间: 2016-11
• 期刊: Journal of the Acoustical Society of America
• 影响因子: 2.4
• 作者: S. Mezil;K. Fujita;Montonobu Tomoda;M. Clark;O. Wright;O. Matsuda

Extraordinary transmission of gigahertz surface acoustic waves.

• DOI: 10.1038/srep33380
• 发表时间: 2016-09-19
• 期刊: Scientific reports
• 影响因子: 4.6
• 作者: Mezil S;Chonan K;Otsuka PH;Tomoda M;Matsuda O;Lee SH;Wright OB
• 通讯作者: Wright OB

Le Mans Universite(France)

勒芒大学（法国）

Sapienza Universita di Roma(Italy)

罗马第一大学（意大利）