Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

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

GLOBALFOUNDRIES and Chengdu Partner to Expand FD-SOI Ecosystem in China: More than $100M investment to establish a center of excellence for FDXTM FD-SOI design May 23rd, 2017

Zap! Graphene is bad news for bacteria: Rice, Ben-Gurion universities show laser-induced graphene kills bacteria, resists biofouling May 22nd, 2017

Leti Will Demo World’s-first WVGA 10-µm Pitch GaN Microdisplays for Augmented Reality Video at Display Week in Los Angles: Invited Paper also Will Present Leti’s Success with New Augmented Reality Technology That Reduces Pixel Pitch to Less than 5 Microns May 22nd, 2017

Graphene-nanotube hybrid boosts lithium metal batteries: Rice University prototypes store 3 times the energy of lithium-ion batteries May 19th, 2017

Discoveries

Zap! Graphene is bad news for bacteria: Rice, Ben-Gurion universities show laser-induced graphene kills bacteria, resists biofouling May 22nd, 2017

Sensors detect disease markers in breath May 19th, 2017

Graphene-nanotube hybrid boosts lithium metal batteries: Rice University prototypes store 3 times the energy of lithium-ion batteries May 19th, 2017

Plasmon-powered upconversion nanocrystals for enhanced bioimaging and polarized emission: Plasmonic gold nanorods brighten lanthanide-doped upconversion superdots for improved multiphoton bioimaging contrast and enable polarization-selective nonlinear emissions for novel nanoscal May 19th, 2017

Announcements

GLOBALFOUNDRIES and Chengdu Partner to Expand FD-SOI Ecosystem in China: More than $100M investment to establish a center of excellence for FDXTM FD-SOI design May 23rd, 2017

Zap! Graphene is bad news for bacteria: Rice, Ben-Gurion universities show laser-induced graphene kills bacteria, resists biofouling May 22nd, 2017

Leti Will Demo World’s-first WVGA 10-µm Pitch GaN Microdisplays for Augmented Reality Video at Display Week in Los Angles: Invited Paper also Will Present Leti’s Success with New Augmented Reality Technology That Reduces Pixel Pitch to Less than 5 Microns May 22nd, 2017

Graphene-nanotube hybrid boosts lithium metal batteries: Rice University prototypes store 3 times the energy of lithium-ion batteries May 19th, 2017

Photonics/Optics/Lasers

Zap! Graphene is bad news for bacteria: Rice, Ben-Gurion universities show laser-induced graphene kills bacteria, resists biofouling May 22nd, 2017

Plasmon-powered upconversion nanocrystals for enhanced bioimaging and polarized emission: Plasmonic gold nanorods brighten lanthanide-doped upconversion superdots for improved multiphoton bioimaging contrast and enable polarization-selective nonlinear emissions for novel nanoscal May 19th, 2017

Gas gives laser-induced graphene super properties: Rice University study shows inexpensive material can be superhydrophilic or superhydrophobic May 15th, 2017

Researchers develop transistors that can switch between two stable energy states May 9th, 2017

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