Navigation Links
Faster X-ray interferometers due to single-photon interference
Date:12/18/2007

This release is also available in German.

By means of X-ray interferometers, lengths down to the mm range can be measured with a resolution of less than one nm. The low translation velocity of the interferometers, which made their use in practice more difficult, could now be increased by a factor of 100 by exploiting the temporal correlation of singly interfering X-ray photons.

X-ray interferometers can measure lengths in the mm range with sub-nm resolution, whereby the almost perfect crystal grid of high-purity silicon is used as a length scale. The dimensions of any sub-m-structured samples are thereby compared with the lattice parameter of silicon (0~0.543... nm) which has been determined very precisely within the scope of the project for the new definition of the Avogadro constant. For metrological applications in connection with scanning probe microscopes, such measurements are of great importance.

Up to now, a further spreading of this method had, however, been impeded by the low translation velocities of only 1 nm/s to 10 nm/s. They are due to the limited intensity of typical laboratory X-ray sources: the necessary filtering of the periodic interference signal leads to a reduction in contrast which, in a classic measurement, requires a slow translation of the interferometer.

In a quantum-mechanical sense, however, interference occurs also in a strongly "diluted" stream of X-ray photons: Regarded as a wave packet, even single photons follow in their temporal impact on the detector the same probability which, in the case of sufficiently intense X-ray light, leads to the continuous signal whose period one wants to determine. This well-known quantum-mechanical fact is now exploited for a specific purpose: if one protocols the times at which the single photons hit the detector, one can, by means of a subsequent Fourier transform of this time series, determine very precisely the frequency at which the lattice periods were passed. At constant velocity, it is then possible to reconstruct the path information, and one obtains the same information as with the classic measurement, but in a much shorter amount of time.

Thus, translation velocities of up to 1000 nm/s could be realised. This method will in future not only be used in further improved measuring arrangements for the determination of the lattice parameter of silicon, but also for other length measurements in nanotechnology.


'/>"/>

Contact: U. Kuetgens
ulrich.kuetgens@ptb.de
49-531-592-4330
Physikalisch-Technische Bundesanstalt (PTB)  
Source:Eurekalert

Related biology technology :

1. Roche Real-Time HIV Test is Faster and Less Labor-Intensive Than Competitors
2. Penn engineers design computer memory in nanoscale form that retrieves data 1,000 times faster
3. Penn engineers design computer memory in nanoscale form that retrieves data 1,000 times faster
4. Elekta Announces Elekta Infinity - a New System for Faster and More Precise Treatment of Cancer Tumors
5. Siemens and Xintek Form Joint Venture to Develop Nanotechnology-Enabled Multi-Pixel X-ray Tubes
6. Sigma-Aldrich and the Universite de Montreal Establish Collaboration for RNA Interference Studies
7. Alfacell to Host Webinar on RNA Interference-Like Mechanics of RNase Therapeutics on Nov. 29
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Faster X-ray interferometers due to single-photon interference
(Date:3/23/2017)... -- According to a report by Transparency Market Research ... to the presence of a large pool of participants; however, only ... and Sigma-Aldrich, compete with each other in this market. With Proliant ... 76% of this market in 2016.  ... As of now, a large number of vendors ...
(Date:3/22/2017)... , March 22, 2017 Regeneron Pharmaceuticals, Inc. ... Regeneron Genetics Center (RGC), U.K. Biobank and GSK to generate ... U.K. Biobank resource. The initiative will enable researchers to gain ... medicines for a wide range of serious and life threatening ... ...
(Date:3/22/2017)... 22, 2017 Good Start Genetics, a leading ... the 130 million covered lives mark through its most ... Texas . With newly signed contracts nationally ... enjoy strong payor acceptance based on the quality of ... genetic counseling, its industry-leading customer care and support and ...
(Date:3/22/2017)... , March 22, 2017 MarketNewsUpdates.com News ... ... conditions are being pressured as of late due to the ... pain management has a dramatic impact on patient,s quality of ... development activities for identifying new forms of opioid formulations that ...
Breaking Biology Technology:
(Date:3/22/2017)... March 21, 2017 Vigilant Solutions , ... law enforcement agencies, announced today the appointment of retired ... of public safety business development. Mr. Sheridan ... experience, including a focus on the aviation transportation sector, ... recent position, Mr. Sheridan served as the Aviation Liaison ...
(Date:3/13/2017)... , March 13, 2017 Future of security: Biometric ... ... DERMALOGs Face Matching enables to match face pictures ... the basis to identify individuals. (PRNewsFoto/Dermalog Identification Systems) ... DERMALOG,s "Face Matching" is the fastest software for biometric Face ...
(Date:3/7/2017)... LAKE CITY , March 7, 2017   ... that help top global companies identify the best talent, ... as Chief Sales Officer (CSO) and Diana ... Kucer,s appointments round out a seasoned executive team poised to ... and beyond, building on a year of record bookings ...
Breaking Biology News(10 mins):