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  4. Accelerated deep self-supervised ptycho-laminography for three-dimensional nanoscale imaging of integrated circuits
 
research article

Accelerated deep self-supervised ptycho-laminography for three-dimensional nanoscale imaging of integrated circuits

Kang, Iksung
•
Jiang, Yi
•
Holler, Mirko
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2023
Optica

Three-dimensional inspection of nanostructures such as integrated circuits is important for security and reliability assurance. Two scanning operations are required: ptychographic to recover the complex transmissivity of the specimen, and rotation of the specimen to acquire multiple projections covering the 3D spatial frequency domain. Two types of rotational scanning are possible: tomographic and laminographic. For flat, extended samples, for which the full 180° coverage is not possible, the latter is preferable because it provides better coverage of the 3D spatial frequency domain compared to limited-angle tomography. It is also because the amount of attenuation through the sample is approximately the same for all projections. However, both techniques are time consuming because of extensive acquisition and computation time. Here, we demonstrate the acceleration of ptycho-laminographic reconstruction of integrated circuits with 16 times fewer angular samples and 4.67 times faster computation by using a physics-regularized deep self-supervised learning architecture. We check the fidelity of our reconstruction against a densely sampled reconstruction that uses full scanning and no learning. As already reported elsewhere [Opt. Express 28, 12872 (2020) [CrossRef] ], we observe improvement of reconstruction quality even over the densely sampled reconstruction, due to the ability of the self-supervised learning kernel to fill the missing cone.

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Type
research article
DOI
10.1364/OPTICA.492666
Author(s)
Kang, Iksung
Jiang, Yi
Holler, Mirko
Guizar Sicairos, Manuel  
Levi, A. F. J.
Klug, Jeffrey
Vogt, Stefan
Barbastathis, George
Date Issued

2023

Published in
Optica
Volume

10

Issue

8

Start page

1000

End page

1008

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CXI  
Available on Infoscience
September 8, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/200393
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