[phas-alumni] [phas-dept] Feb 3 colloquium by a YouTube presentation (no meeting)

[Heungman Park]

Dear all in Physics and Astronomy,

We do not meet this week Thursday. Instead, we have a YouTube presentation below.

PHYS-401/501 students must complete an assignment (submitting a summary report) on D2L when there is no in-person meeting on a week.




https://youtu.be/eu935QmkgHg


Nanofabrication of diffractive optics for X-ray wavefront shaping and imaging

 - MIT.nano -

Kahraman Keskinbora, research scientist in the Department of Physics, gave the Nano Explorations seminar on Tuesday, June 8, 2021.

The use of coherent X-rays for materials characterization has a vast range of applications, from developing more efficient energy storage materials to imaging spin waves in modern magnetic materials. Diffractive optics are one of the best options to successfully focus and shape X-ray wavefronts to carry out a specific task, especially in the soft X-ray regime. Whether it is an imaging application or a more complex task, efficient shaping of X-rays requires a diffractive optic to have high aspect ratios and complex geometries. Owing to the specifics of X-ray matter interactions, the fabrication of diffractive optics for this energy range is still a serious nanofabrication challenge.

Keskinbora gave an overview of various ways to overcome this challenge. More specifically, this talk focused on the advantages of using ion beam lithography (IBL) to fabricate incredibly intricate diffractive optic patterns in a single fabrication step. Keskinbora talked about the benefits of the dedicated IBL instrument with a multi-species ion beam source that is part of the toolset at MIT.nano, and its applications to diffractive X-ray optics fabrication. Finally, Keskinbora briefly touched upon the soft X-ray beam-shaping applications of these fascinating X-ray optic devices.

_____________________________________
Heungman Park, Ph.D.
Assistant Professor
Department of Physics & Astronomy
Texas A&M University-Commerce
Commerce, TX 75429, USA

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