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4. Resonant Laser Printing of Optical Metasurfaces

Author

Zhu, Xiaolong, primary, Engelberg, Jacob, additional, Remennik, Sergei, additional, Zhou, Binbin, additional, Pedersen, Jonas Nyvold, additional, Uhd Jepsen, Peter, additional, Levy, Uriel, additional, and Kristensen, Anders, additional

Published
2022
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7. Analysis of a 17C Panel Painting by Reflection Terahertz Time Domain-Imaging (THz-TDI): contribution of ultrafast optics to museum collections inspection

Author

Koch Dandolo, Corinna Ludovica, Filtenborg, Troels Folke, Uhd Jepsen, Peter, and Skou-Hansen, Jakob

Abstract

THz-TDI has been applied for imaging an hidden painting and other subsurface composition layers of a 17C panel painting belonging to the National Gallery of Denmark. C- and B-scans realized by THz have been compared with images obtained by x-ray radiography, thus helping in a deep understanding of the strengths and limitations of this technique for art diagnostic purpose and in defining its rule among the other complementary investigation tools for art pieces inspection.

Published
2015

19. Terahertz Imaging Systems With Aperture Synthesis Techniques.

Author

Krozer, Viktor, Löffler, Torsten, Dall, Jørgen, Kusk, Anders, Eichhorn, Finn, Olsson, Rasmus Kjelsmark, Due Buron, Jonas, Uhd Jepsen, Peter, Zhurbenko, Vitaliy, and Jensen, Thomas

Subjects
TERAHERTZ technology, PHOTONICS, SYNTHETIC aperture radar, IMAGING systems, HIGH technology
Abstract

This paper presents the research and development of two terahertz imaging systems based on photonic and electronic principles, respectively. As part of this study, a survey of ongoing research in the field of terahertz imaging is provided focusing on security applications. Existing terahertz imaging systems are reviewed in terms of the employed architecture and data processing strategies. Active multichannel measurement method is found to be promising for real-time applications among the various terahertz imaging techniques and is chosen as a basis for the imaging instruments presented in this paper. An active system operation allows for a wide dynamic range, which is important for image quality. The described instruments employ a multichannel high-sensitivity heterodyne architecture and aperture filling techniques, with close to real-time image acquisition time. In the case of the photonic imaging system, mechanical scanning is completely obsolete. We show 2-D images of simulated 3-D image data for both systems. The reconstruction algorithms are suitable for 3-D real-time operation, only limited by mechanical scanning. [ABSTRACT FROM AUTHOR]

Published
2010
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