1. Micron-scale imaging using bulk ultrasonics.
- Author
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Chandran, Loheshwaran, Syed Akbar Ali, Mohamed Subair, Bobbs, Bradley, Dutta, Chandan, JD, Joseph, Bhattacharya, Enakshi, and Rajagopal, Prabhu
- Subjects
- *
ACOUSTIC microscopy , *CORPORATE resolutions , *SIGNAL processing , *ELECTROMAGNETIC radiation , *METAMATERIALS - Abstract
An extraordinary resolution down to 50 microns is demonstrated for the first time for bulk ultrasonics, using novel micro-fabricated metamaterial lenses. The development and performance of the silicon-based Fabry–Perot type metalenses with an array of 10 micrometre square holes are discussed. Challenges in wave reception are addressed by a custom-developed micro-focal laser with a sub-micron spot size and an innovative experimental set-up together with physics based signal processing. The results provide a pathway for material diagnostics at greater depths with high resolution using micro-metalens-enhanced ultrasound as an alternative to expensive and radiation prone electromagnetic techniques. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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