Conference proceeding
Design and fabrication of adjustable x-ray optics using piezoelectric thin films
Proceedings of SPIE - The International Society for Optical Engineering, Vol.10399, pp.103991K-103991K-12
08/29/2017
DOI: 10.1117/12.2275351
Abstract
Piezoelectric adjustable optics are being developed for high throughput, high resolution, low mass Xray mirror assemblies. These optics require robust piezoelectric thin films and reproducible lithographic patterning on curved glass substrates. This work details the cleaning of Corning Eagle XG glass substrates for thin shell X-ray mirrors by a three stage acid and solvent cleaning procedure before a 0.02 μm Ti adhesion layer and a 0.1 μm Pt bottom electrode layer was deposited using DC magnetron sputtering. Piezoelectric Pb(Zr0.52Ti0.48)0.99Nb0.01O3 thin films with a thickness of 1.5 μm were then deposited by radio frequency magnetron sputtering in three 0.5 µm layers with intermittent annealing steps in a rapid thermal annealing furnace at 650°C for 60 seconds. Defects observed in the piezoelectric thin films were linked to residue remaining on the glass after cleaning. 112 piezoelectric cells and 100 μm wide conductive Pt traces were patterned using bilayer photolithography. The photoresist layers were deposited using spin coating at 2000 and 4000 RPM to achieve uniform 1 μm thick layers, resulting in reproducibly resolved features with limiting resolutions of approximately >25 μm. The resulting mirror pieces achieved a 100% yield, with average relative permittivity of 1270, dielectric loss 0.047, coercive field 30 kV/cm and remanent polarization of 20 μC/cm2 . While the defects observed in the films appeared to have not influence on the electrical properties, additional cleaning steps using DI water were proposed to further reduce their presence.
Details
- Title: Subtitle
- Design and fabrication of adjustable x-ray optics using piezoelectric thin films
- Creators
- J Walker - Pennsylvania State UniversityT Liu - Pennsylvania State UniversityM Tendulkar - Pennsylvania State UniversityD Burrows - Pennsylvania State UniversityC. T DeRoo - Harvard UniversityR Allured - Harvard UniversityE Hertz - Harvard UniversityV Cotroneo - Harvard UniversityP Reid - Harvard UniversityE. D Schwartz - Harvard UniversityT. N Jackson - Pennsylvania State UniversityS Trolier-McKinstry - Harvard-Smithsonian Ctr. for Astrophysics (United States)
- Contributors
- Stephen L O'Dell (Editor) - NASA Marshall Space Flight Ctr. (United States)Giovanni Pareschi (Editor) - INAF - Osservatorio Astronomico di Brera (Italy)
- Resource Type
- Conference proceeding
- Publication Details
- Proceedings of SPIE - The International Society for Optical Engineering, Vol.10399, pp.103991K-103991K-12
- Publisher
- SPIE
- DOI
- 10.1117/12.2275351
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Language
- English
- Date published
- 08/29/2017
- Academic Unit
- Physics and Astronomy; University College Courses
- Record Identifier
- 9984200056002771
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