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Wielgus M.,Polish Institute of Electron Technology | Wielgus M.,Institute of Micromechanics and Photonics | Grochowski J.,Polish Institute of Electron Technology | Grochowski J.,Institute of Microelectronics and Optoelectronics | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

We present a novel application of the continuous wavelet transform (CWT) for quantitative analysis of electron diffraction fringe patterns for material science research. With this method unsupervised analysis of large data sets can be performed, to determine statistical distribution of fringe periods, corresponding to the spacing between the planes in the atomic lattice. It is more robust and less time consuming than typical manual approach. Obtained information can be further utilized for characterization and identification of the crystallographic structures present in the sample. The proposed method is applied to analysis of high resolution transmission electron microscope (HRTEM) images of Iridium-Zinc-Silicon-Oxide thin films, which reveal nanocrystallic structures dispersed in an amorphous matrix. © 2012 SPIE. Source


Drozdowski W.,Nicolaus Copernicus University | Brylew K.,Nicolaus Copernicus University | Malinowski M.,Institute of Microelectronics and Optoelectronics | Turczynski S.,Institute Of Electronic Materials Technology of Poland
Journal of Alloys and Compounds | Year: 2015

Y4Al2O9:Pr (YAM:Pr) crystals have been grown by the micro-pulling-down method and their scintillation properties have been investigated. YAM:0.1%Pr displays a light yield of about 2000 ph/MeV and its scintillation time profile contains a prompt component with a decay time of 23.5 ns and a contribution of 20%. Radioluminescence spectra show both fast d-f and slow f-f praseodymium emissions. Low temperature glow curves are complex, consisting of discrete peaks and broad bands related to quasi-continuous trap distributions. Overall scintillation performance of YAM:Pr deteriorates with increasing praseodymium concentration. © 2015 Elsevier B.V. All rights reserved. Source


Yang L.,Institute of Microelectronics and Optoelectronics | Hu T.,Zhejiang University | Shen A.,Zhejiang University | Pei C.,Zhejiang University | And 5 more authors.
IEEE Photonics Technology Letters | Year: 2014

We propose a new method to change the resonant status of the microring by modifying the light-absorption ability of the waveguide. A conception of a 2 × 2 microring switch based on the graphene-silicon-waveguide is presented by inserting a single graphene flake inside the lateral slot waveguide. The resonance procedure of the microring is thoroughly blocked when the graphene is tuned to be a zero-permittivity material, which significantly enhances the waveguide's loss. Neither a high quality factor nor a large driving voltage of the microring is needed. According to the numerical analysis, an extinction ratio for > 50 dB is obtained in the drop port with a broad bandwidth. The extinction ratio in the through port is 34 dB. The radius of the microring is 5.1 μm and the driving voltage is 2.38 V. © 2013 IEEE. Source


Boruc Z.,Institute of Microelectronics and Optoelectronics | Kaczkan M.,Institute of Microelectronics and Optoelectronics | Fetlinski B.,Institute of Microelectronics and Optoelectronics | Turczynski S.,Institute Of Electronic Materials Technology of Poland | Malinowski M.,Institute of Microelectronics and Optoelectronics
Optics Letters | Year: 2012

Temperature dependent emission spectra and decay times of trivalent dysprosium (Dy3+) activated Y4Al2O9 (YAM) crystals have been studied for the first time (to our knowledge). The ratio of emission lines intensity can be used in temperature measurements, as it is not dependent on the variability of absolute intensity. The Boltzmann model was applied for modeling the temperature variation of the 4I 15/2 and 4F9/2 states emissions relative intensities 455 and 481 nm, respectively. The calculated approximation gives highest sensor sensitivity of about 3 × 10-3°C-1 for the 600°C-800°C range, which allows for an expectation of usefulness of Dy3+:YAM in high-temperature luminescence thermometry. Also, the measured decay times are suitable for temperature sensing. © 2012 Optical Society of America. Source


Kaczkan M.,Institute of Microelectronics and Optoelectronics | Boruc Z.,Institute of Microelectronics and Optoelectronics | Fetlinski B.,Institute of Microelectronics and Optoelectronics | Turczynski S.,Institute Of Electronic Materials Technology of Poland | Malinowski M.,Institute of Microelectronics and Optoelectronics
Applied Physics B: Lasers and Optics | Year: 2013

Temperature-dependent emission spectra and fluorescence dynamics profiles have been investigated in Pr3+:Y4Al2O 9 crystals in order to better understand the processes responsible for quenching of the praseodymium 3P0 emissions. The cross-relaxation transfer rates were experimentally determined as a function of temperature. Using the rate equations formalism, the dynamics of the observed emissions were modeled. Basing on comparison between the measured and calculated decays, the energy transfer rates between Pr3+ ions were evaluated. The role of the backward process in explanation of the complicated character of 3P0 decays and its temperature dependence, especially its unexpectedly slow decaying component, were established. © 2013 The Author(s). Source

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