Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 19, Number 1, 2023
EOSAM 2021
|
|
---|---|---|
Article Number | 7 | |
Number of page(s) | 7 | |
DOI | https://doi.org/10.1051/jeos/2023004 | |
Published online | 09 February 2023 |
Research Article
Wide band UV/Vis/NIR blazed-binary reflective gratings for spectro-imagers: two lithographic technologies investigation
1
Thales Research & Technology, 1 Avenue Augustin Fresnel, 91767 Palaiseau, France
2
Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Strasse 7, 07745 Jena, Germany
3
Thales Alenia Space, 5 Allée des Gabians, BP 99, 06156 Cannes la Bocca Cedex, France
4
European Space Research and Technology Centre, Postbus 299, 2200 AG Noordwijk, The Netherlands
* Corresponding author: mane-si-laure.lee@thalesgroup.com
Received:
1
February
2022
Accepted:
10
January
2023
We report on subwavelength reflective gratings for hyperspectral applications operating in a very large spectral band (340–1040 nm). Our study concerns a blazed-binary grating having a period of 30 μm and composed of 2D subwavelength structures with size from 120 nm to 350 nm. We demonstrate the manufacturing of the gratings on 3″ wafers by two lithography technologies (e-beam and nanoimprint) followed by classical dry etching process. Optical measurements show that the subwavelength grating approach enables a broadband efficiency, polarization behaviour and wavefront quality improvement with respect to the requirements for the next generation of spectro-imagers for Earth observation missions. An outlook towards spherical substrate based on nanoimprint lithography is also reported with the results of mixed features replication (holes and pillars in the range of 160–330 nm) on a 540 mm concave substrate which demonstrate uniformity and accuracy capabilities over 3″ surface.
Key words: Diffraction grating / Subwavelength structures / Electron beam lithography / Nanoimprint lithography / Effective index media
© The Author(s), published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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