Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > X-ray lasers in focus: A new large high-precision mirror is capable of focusing x-ray radiation to spot sizes of just a few nanometers

Figure 1: Schematic showing the position of the mirror in the x-ray free electron laser setup.
Figure 1: Schematic showing the position of the mirror in the x-ray free electron laser setup.

Abstract:
Radiation from x-ray lasers such as x-ray free electron lasers are of wide interest, as they will allow a large number of applications such as the study of the structure of single molecules. However, for such applications to be realized, the x-rays need to be strongly focused at the nanoscale. Researchers from the RIKEN Advanced Science Institute in Wako, collaborating with researchers from Osaka University and the Japan Synchrotron Radiation Research Institute (JASRI), have now developed a mirror suitable for this task.

X-ray lasers in focus: A new large high-precision mirror is capable of focusing x-ray radiation to spot sizes of just a few nanometers

Japan | Posted on November 28th, 2008

High-energy x-ray radiation is very damaging, so mirrors with curved surfaces are used in the focusing of x-rays to minimize penetration into imaging devices. As an incident laser beam reaches a mirror at a very small angle, a mirror surface of 400 mm in length is needed to collect all light from the laser (Fig. 1). The researchers recently published the details of their successful fabrication of the first such large-scale mirror—capable of focusing x-rays down to the theoretical limit at the nanoscale—in the journal Review of Scientific Instruments1.

The material of choice for this mirror was silicon. Being a relatively light element, it absorbs x-rays only weakly, meaning less long-term damage to the mirror. As any imperfections can have a significant impact on imaging quality, the researchers ensured the surface was perfect. According to Hitoshi Ohmori, who led the efforts at RIKEN, "the key advance in the fabrication of this mirror is the achievement of an ultra-smooth surface in combination with such a large mirror size."

The highly polished mirror surface was achieved in a two-step procedure. First, the researchers used the high-precision grinding technique, called electrolytic in-process dressing (ELID), to obtain a height precision across the mirror of about 100 nm. Then they used the ultra-precise elastic emission machining (EEM) process, which is based on chemical reactions between the silicon surface and micron-sized abrasive particles. Overall, a precision of 2 nm was achieved across the entire 400 mm long mirror, corresponding to a height precision of 2 mm over a length roughly the distance between Tokyo and Osaka (approximately 400 km).

In the first performance tests, the researchers used the mirror to focus a 15 keV x-ray beam from the SPring-8 facility to a spot size of 75 nm—almost equal to the theoretical limit that a perfect mirror can achieve. The aim now, Ohmori emphasizes, is to perfect this technology to offer a scalable and efficient process to fabricate x-ray mirror optics.
Reference

1. Mimura, H., Morita, S., Kimura, T., Yamakawa, D., Lin, W., Uehara, Y., Matsuyama, H., Yumoto, H., Ohashi, H.., Tamasaku, K. et al. Focusing mirror for x-ray free-electron lasers. Review of Scientific Instruments 79, 083104 (2008).

The corresponding author for this highlight is based at the RIKEN Materials Fabrication Laboratory

####

For more information, please click here

Copyright © Riken

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

article

Related News Press

News and information

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

Discoveries

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Iranian Scientists Use Nanotechnology to Increase Power, Energy of Supercapacitors December 18th, 2014

Announcements

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Aculon Hires New Business Development Director December 19th, 2014

Photonics/Optics/Lasers

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Nanoshaping method points to future manufacturing technology December 11th, 2014

Stacking two-dimensional materials may lower cost of semiconductor devices December 11th, 2014

Defects are perfect in laser-induced graphene: Rice University lab discovers simple way to make material for energy storage, electronics December 10th, 2014

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE