Entity

Time filter

Source Type

Besançon, France

Dehlinger M.,French National Center for Scientific Research | Fauquet C.,French National Center for Scientific Research | Jandard F.,French National Center for Scientific Research | Bjeoumikhov A.,IFG GmbH | And 8 more authors.
X-Ray Spectrometry | Year: 2013

Capillary optics are used for X-ray fluorescence micro-analysis using the Cu Kα line provided by a rotating anode. The excitation beam is focused using a polycapillary lens on a Co-Ti sample. Cylindrical glass capillaries of various diameters are fitted to the X-ray detector (Energy Dispersive X-Ray (EDX) analyzer) and displaced along the irradiated zone of the sample. The fluorescence is studied as a function of capillary position. Good agreement is found between experimental and calculated lateral widths of the fluorescence collection, taken into account the cylindrical capillary critical angles relevant in the experiment. The influence of the cylindrical capillary diameter on the signal level detected is studied to estimate the possibility of lateral resolution increase of X-ray fluorescence technique both in-lab and in synchrotron environment. © 2013 John Wiley & Sons, Ltd. Source


Fauquet C.,CNRS Interdisciplinary Nanoscience Centre of Marseille | Dehlinger M.,CNRS Interdisciplinary Nanoscience Centre of Marseille | Jandard F.,CNRS Interdisciplinary Nanoscience Centre of Marseille | Ferrero S.,AXESS Technology | And 9 more authors.
Nanoscale Research Letters | Year: 2011

A new versatile tool, combining Shear Force Microscopy and X-Ray Spectroscopy was designed and constructed to obtain simultaneously surface topography and chemical mapping. Using a sharp optical fiber as microscope probe, it is possible to collect locally the visible luminescence of the sample. Results of tests on ZnO and on ZnWO4 thin layers are in perfect agreement with that obtained with other conventional techniques. Twin images obtained by simultaneous acquisition in near field of surface topography and of local visible light emitted by the sample under X-Ray irradiation in synchrotron environment are shown. Replacing the optical fibre by an X-ray capillary, it is possible to collect local X-ray fluorescence of the sample. Preliminary results on Co-Ti sample analysis are presented. © 2011 Stergiopoulos et al. Source


Dudek M.,Warsaw University of Technology | Kujawinska M.,Warsaw University of Technology | Parat V.,LovaLite | Baethge G.,LovaLite | And 3 more authors.
Optical Engineering | Year: 2014

We present the tomographic study of the refractive index distribution in polymer bridges between two optical fibers. Detailed refractive index maps are needed in order to improve the technological process for manufacturing those bridges and to achieve a lower return loss. At first, the technological process of the fabrication of bridges through photopolymerization is presented. The interferometric measurements of reference fibers used to produce those bridges and two series of microbridges are performed experimentally in the visible (VIS; 632.8 nm) and infrared (IR; 1550 nm) wavelength regions. The relation between the VIS and IR results is determined, which allows performing tomographic measurements in more accurate conditions in the VIS spectrum. The experimentally obtained refractive index distributions in the microbridges are used for modeling the insertion and return losses, which are compared with the real loss obtained for the produced microbridges. This knowledge will be used for better understanding the manufacturing process and its further optimization. © Society of Photo-Optical Instrumentation Engineers. Source


Dudek M.,Warsaw University of Technology | Kujawinska M.,Warsaw University of Technology | Michalska A.,Warsaw University of Technology | Ottevaere H.,Vrije Universiteit Brussel | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

In this paper we present the tomographic studies of refractive index distribution in polymer bridges between two optical fibers. Detailed refractive index maps are needed in order to improve the technological process of manufacturing of those bridges and to achieve lower return losses. At first the technological process of bridges fabrication through photopolymerization is presented. The interferometric measurements of reference fibers used to produce those bridges and two series of microbridges are performed in visible (632.8 nm) and infrared (1550 nm) experimental systems. The relations between vis and IR results are determined, which allows for performing tomographic measurements in more accurate conditions secured in visible spectrum. The experimentally obtained refractive index distributions in microbridges are used for modeling the insertion and return losses, which are compared with the real losses obtained for the produced microbridges. This knowledge will be used for better understanding of the manufacturing process and its further optimization. © 2013 SPIE. Source


Kujawinska M.,Warsaw University of Technology | Parat V.,LovaLite | Dudek M.,Warsaw University of Technology | Siwicki B.,Warsaw University of Technology | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

In this paper we present a simple method of manufacturing micrometer-sized polymer elements at the extremity of both single mode and multimode optical fibers and its possible modifications in order to provide requested functionalities. We show that the knowledge about 3D distribution of refractive index and birefringence in these elements is required and that interferometric and elastooptics tomography are the methods which provide these data. Exemplary polymer microtips manufactured from the polymeric material with different concentration of heptafluorobutyric acid are investigated in tomographic systems and the obtained results are discussed in reference to the theoretically expected refractive index distributions. © 2012 SPIE. Source

Discover hidden collaborations