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Old X-rays, new vision: A nano-focused X-ray laser

Date:
July 8, 2020
Source:
Osaka University
Summary:
Researchers have focused the beam of an X-ray free-electron laser to 6 nanometers, closer to the diameter of a typical atom than obtained in prior work. In conjunction with the extremely brief pulses and high intensities of the laser, researchers can now study matter at extremely high resolution and unprecedented speed.
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Imagine taking movies of the fastest chemical processes, or imaging atomic-scale detail of single virus particles without damaging them. Researchers from Japan have advanced the state-of-the-art in such endeavors, by enhancing the utility of a special X-ray laser for nanometer-scale measurements.

In a study recently published in Journal of Synchrotron Radiation, researchers from Osaka University, in collaboration with RIKEN and Japan Synchrotron Radiation Research Institute (JASRI), have reduced the beam diameter in an X-ray free-electron laser to 6 nanometers in width. This considerably improves the utility of these lasers for imaging structures closer to the atomic level than possible in prior work.

To "see" extremely small and otherwise invisible objects, and observe ultrafast chemical processes, researchers commonly use synchrotron X-ray facilities. X-ray free-electron lasers are an alternative that can -- in principle -- image atomic-scale detail of, for example, a virus particle, on the timescale of an electron transition, without damaging the particle. To do this, you need an incredibly bright X-ray laser that focuses extremely fast laser pulses on the nanometer scale.

"Using multilayer focusing mirrors, we narrowed the width of our laser beam down to a diameter of 6 nanometers," says lead author of the study Takato Inoue. "This is not quite the diameter of a typical atom, but we're making good progress."

Until now, it has been difficult to focus X-ray free-electron lasers to such small diameters. That's because of challenges in fabricating the required mirrors, and confirming the focused size of the lasers. The researcher team addressed the focusing problem by analyzing the shape of the laser's interference patterns, known as speckle profiles.

"We generated speckle profiles by coherent X-ray scattering of randomly distributed metal nanoparticles," explains Satoshi Matsuyama, senior author. "This enabled experimental measurements of the laser beam profile, which were in good agreement with theoretical calculations."

Because the laser beam diameter can be so precisely measured, further advancements are now feasible. For example, by using atoms for the scattering analysis, X-ray free-electron laser measurements can be improved to a 1-nanometer focus.

The researchers anticipate that extremely high-intensity lasers, over a million trillion times brighter than the Sun, will now be useful for imaging ultrafast molecular processes -- at atomic-scale detail -- that are beyond the capabilities of the most advanced synchrotrons. With such technology, protein molecules and other small important biological entities can be imaged without damaging them under the strategy of "diffraction before destruction," by using a single laser pulse.


Story Source:

Materials provided by Osaka University. Note: Content may be edited for style and length.


Journal Reference:

  1. Takato Inoue, Satoshi Matsuyama, Jumpei Yamada, Nami Nakamura, Taito Osaka, Ichiro Inoue, Yuichi Inubushi, Kensuke Tono, Hirokatsu Yumoto, Takahisa Koyama, Haruhiko Ohashi, Makina Yabashi, Tetsuya Ishikawa, Kazuto Yamauchi. Generation of an X-ray nanobeam of a free-electron laser using reflective optics with speckle interferometry. Journal of Synchrotron Radiation, 2020; 27 (4): 883 DOI: 10.1107/S1600577520006980

Cite This Page:

Osaka University. "Old X-rays, new vision: A nano-focused X-ray laser." ScienceDaily. ScienceDaily, 8 July 2020. <www.sciencedaily.com/releases/2020/07/200708110008.htm>.
Osaka University. (2020, July 8). Old X-rays, new vision: A nano-focused X-ray laser. ScienceDaily. Retrieved May 28, 2024 from www.sciencedaily.com/releases/2020/07/200708110008.htm
Osaka University. "Old X-rays, new vision: A nano-focused X-ray laser." ScienceDaily. www.sciencedaily.com/releases/2020/07/200708110008.htm (accessed May 28, 2024).

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