From Event: SPIE Optical Engineering + Applications, 2016
Here we report progress toward the fabrication of adaptive or active Si X-ray mirrors via a two step process. The first
step is to curve a Si flat and then coat it with Terfenol-D that will allow the shape control via the application of a
magnetic field. The goal is to create a mirror whose local (a few mm-length scale) slope can be changed and left for
several hours or more. The current work described here was done in on Si to demonstrate the ability to produce the
initial curvature, and in parallel, work to on magnetically hard NiCo 5 cm x 5 cm square plus on a glass sample. The
glass sample was used a proto-type to model making changes in two different locations on a mirror. The NiCo sample
was used to show that a magnetic field can be retained in a magnetically hard substrate such that the magnetically
induced stress in the Terfenol-D was able to maintain a deformation for as long as time permitted to make the
measurement which was 71 hours.
Xiaoli Wang, Youwei Yao, Shi Ye, Tianchen Liu, Lahsen Assoufid, Jian Cao, and M. P. Ulmer, "Shaping Si, NiCo, and glass substrates via stresses in the coatings," Proc. SPIE 9965, Adaptive X-Ray Optics IV, 99650D (Presented at SPIE Optical Engineering + Applications: August 28, 2016; Published: 9 September 2016); https://doi.org/10.1117/12.2237785.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon