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Proceedings Paper

Atomic layer deposition and etching methods for far ultraviolet aluminum mirrors
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Paper Abstract

High-performance aluminum mirrors at far ultraviolet wavelengths require transparent dielectric materials as protective coatings to prevent oxidation. Reducing the thickness of this protective layer can result in additional performance gains by minimizing absorption losses, and provides a path toward high Al reflectance in the challenging wavelength range of 90 to 110 nm. We have pursued the development of new atomic layer deposition processes (ALD) for the metal fluoride materials of MgF2, AlF3 and LiF. Using anhydrous hydrogen fluoride as a reactant, these films can be deposited at the low temperatures required for large-area surface-finished optics and polymeric diffraction gratings. We also report on the development and application of an atomic layer etching (ALE) procedure to controllably etch native aluminum oxide. Our ALE process utilizes the same chemistry used in the ALD of AlF3 thin films, allowing for a combination of high-performance evaporated Al layers and ultrathin ALD encapsulation without requiring vacuum transfer. Progress in demonstrating the scalability of this approach, as well as the environmental stability of ALD/ALE Al mirrors are discussed in the context of possible future applications for NASA LUVOIR and HabEx mission concepts.

Paper Details

Date Published: 21 September 2017
PDF: 7 pages
Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 1040119 (21 September 2017); doi: 10.1117/12.2274633
Show Author Affiliations
John Hennessy, Jet Propulsion Lab. (United States)
Christopher S. Moore, Univ. of Colorado Boulder (United States)
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
April D. Jewell, Jet Propulsion Lab. (United States)
Christian Carter, Univ. of Colorado Boulder (United States)
Kevin France, Univ. of Colorado Boulder (United States)
Shouleh Nikzad, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 10401:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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