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:10/11/2017)... ... October 11, 2017 , ... Proscia Inc ., ... a Webinar titled, “Pathology is going digital. Is your lab ready?” with Dr. ... best practices and how Proscia improves lab economics and realizes an increase in ...
(Date:10/11/2017)... , ... October 11, 2017 , ... ... the implantation and pregnancy rates in frozen and fresh in vitro fertilization ... progesterone and maternal age to IVF success. , After comparing the results from ...
(Date:10/10/2017)... Philadelphia, PA (PRWEB) , ... October 10, 2017 ... ... University City Science Center’s FirstHand program has won a US2020 STEM Mentoring Award. ... accept the award for Excellence in Volunteer Experience from US2020. , US2020’s mission ...
(Date:10/10/2017)... ... October 10, 2017 , ... USDM ... firm for the life sciences and healthcare industries, announces a presentation by Subbu ... , The presentation, “Automating GxP Validation for Agile Cloud Platforms,” will present a ...
Breaking Biology Technology:
(Date:4/11/2017)... Research and Markets has announced the addition ... their offering. ... tracking market to grow at a CAGR of 30.37% during the ... 2017-2021, has been prepared based on an in-depth market analysis with ... its growth prospects over the coming years. The report also includes ...
(Date:4/6/2017)... Forecasts by Product Type (EAC), Biometrics, Card-Based ... & Logistics, Government & Public Sector, Utilities / Energy ... Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality & ... for a definitive report on the $27.9bn Access Control ... ...
(Date:4/5/2017)... KEY FINDINGS The global market for stem ... 25.76% during the forecast period of 2017-2025. The rise ... growth of the stem cell market. Download ... The global stem cell market is segmented on the ... cell market of the product is segmented into adult ...
Breaking Biology News(10 mins):