scholarly journals Increased interference fringe visibility from the post-fabrication heat treatment of a perfect crystal silicon neutron interferometer

2018 ◽  
Vol 89 (2) ◽  
pp. 023502 ◽  
Author(s):  
B. Heacock ◽  
M. Arif ◽  
D. G. Cory ◽  
T. Gnaeupel-Herold ◽  
R. Haun ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Interference Fringe ◽  
Perfect Crystal ◽  
Fringe Visibility ◽  
Crystal Silicon ◽  
Neutron Interferometer

scholarly journals Performance and optimization of X-ray grating interferometry

2014 ◽  
Vol 372 (2010) ◽  
pp. 20130027 ◽  
Author(s):  
T. Thuering ◽  
M. Stampanoni
Keyword(s):  
Interference Fringe ◽  
Refraction Angle ◽  
Fringe Visibility ◽  
X Ray ◽  
Analytical Formulae ◽  
Grating Interferometer ◽  
Differential Phase Contrast ◽  
Energy Dependent ◽  
Application Specific ◽  
Contrast Image

The monochromatic and polychromatic performance of a grating interferometer is theoretically analysed. The smallest detectable refraction angle is used as a metric for the efficiency in acquiring a differential phase-contrast image. Analytical formulae for the visibility and the smallest detectable refraction angle are derived for Talbot-type and Talbot–Lau-type interferometers, respectively, providing a framework for the optimization of the geometry. The polychromatic performance of a grating interferometer is investigated analytically by calculating the energy-dependent interference fringe visibility, the spectral acceptance and the polychromatic interference fringe visibility. The optimization of grating interferometry is a crucial step for the design of application-specific systems with maximum performance.

Recovery of reduced fringe visibility due to finite crossing angle between two paths of a neutron interferometer

2011 ◽  
Vol 406 (12) ◽  
pp. 2377-2380
Author(s):  
Kaoru Taketani ◽  
Masahiro Hino ◽  
Hirohiko M. Shimizu
Keyword(s):  
Fringe Visibility ◽  
Neutron Interferometer

Shallow Contact Formation of Gadolinium Silicide

1983 ◽  
Vol 25 ◽  
Author(s):  
I. C. Cheng ◽  
S. S. Lau ◽  
R. D. Thompson ◽  
K. N. Tu
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Schottky Barrier Height ◽  
Single Crystal Silicon ◽  
Atomic Ratio ◽  
Silicon Substrates ◽  
Formation Temperature ◽  
Crystal Silicon ◽  
Contact Formation ◽  
Convenient Technique

ABSTRACTGadolinium silicide with its attractive features of low formation temperature of about 350°C and low Schottky barrier height on n-type single-crystal silicon substrates (ϕnB1∼O.4ev,ϕpB ∼ 0.7ev) was chosen for studying the feasibility of forming shallow uniform contacts. Samples with various compositions prepared by both bilayer evaporation with a configuration of Si(α)/Gd/Si(xtl) and coevaporation with a Si−Gd /Si(xtl)structure were used for studying the contact formation as a function of composition and heat treatment. We found that shallow contact formation can be achieved provided that the following conditions are met: (a) for bilayer evaporation, the atomic ratio of Si(α)/Gd ≥ 2 should be maintained, (b) for coevaporation, the Si to Gd atomic ratio between 1.7 and 2.0 is desired. The bilayer deposition scheme appears to be a more convenient technique to use in practice.

An X-ray interferometer with a large and variable path length difference

2001 ◽  
Vol 34 (2) ◽  
pp. 166-171 ◽  
Author(s):  
K. Fezzaa ◽  
W.-K. Lee
Keyword(s):  
Interference Fringe ◽  
Path Length ◽  
Fringe Visibility ◽  
Visibility Analysis ◽  
Transmitted Beam ◽  
X Ray ◽  
Length Difference ◽  
Path Length Difference ◽  
Coherence Lengths

The first chromatic hard X-ray interferometer with a large and variable path length difference has been built and successfully tested. Interference fringe visibility was measured as a function of the path length difference. Based on the measurements, fringe visibility analysis was performed to give the transmitted beam coherence lengths. The results agree very well with expected coherence values based on the angular and spectral acceptances of the interferometer.

Test measurements with a perfect crystal neutron interferometer

1974 ◽  
Vol 271 (2) ◽  
pp. 177-182 ◽  
Author(s):  
W. Bauspiess ◽  
U. Bonse ◽  
H. Rauch ◽  
W. Treimer
Keyword(s):  
Perfect Crystal ◽  
Neutron Interferometer

Approximate calculation of multiple-diffraction patterns based on Renninger's kinematical `simplest approach'

2000 ◽  
Vol 33 (3) ◽  
pp. 921-927 ◽  
Author(s):  
Elisabeth Rossmanith
Keyword(s):  
Satisfactory Agreement ◽  
Approximate Calculation ◽  
Perfect Crystal ◽  
Multiple Diffraction ◽  
Crystal Silicon ◽  
Mosaic Crystal ◽  
Diffraction Patterns ◽  
Analytical Expressions ◽  
Kinematical Approach ◽  
Reflection Intensity

Analytical expressions for the absolute change of the primary reflection intensity due to multiple diffraction are given in the kinematical approach. It is shown that satisfactory agreement between experiment and theory can be obtained for a mosaic crystal (diamond) as well as for a perfect crystal (silicon) even in the case of strong reflections.

Perfect crystal neutron interferometer set up at BENSC and first experimental results

1995 ◽  
Vol 213-214 ◽  
pp. 839-841
Author(s):  
T. Baranova ◽  
G. Drabkin ◽  
A. Ioffe ◽  
S. Kirsanov ◽  
F. Mezei ◽  
...  
Keyword(s):  
Perfect Crystal ◽  
Experimental Results ◽  
Neutron Interferometer ◽  
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