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Influence of the Heat Treatment on the Band Gaps in the Biopolymer Photonic Crystals

100%
Savic-Sevic S., Pantelic D., Jelenkovic B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
645-646
EN
1D photonic crystal was fabricated in a dichromate-sensitized biopolymer using holography method. The effects of the temperature of the photonic crystal layer on the center of photonic band gaps were studied. We showed that the central wavelength of the band gap can be tuned by heating the photonic crystal layer. By applying such heat treatment, tuning of the position of the band gap for about 80 nm was obtained.
2
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Application of Fourier-Padé Approximation in Analysis οf Holographic Photonic Crystal Structures

88%
Sevic D., Savic-Sevic S., Pantelic D., Jelenkovic B., Marinkovic B.
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EN
In this paper a method based on the Fourier transform and Padé approximants is investigated for analysis of holographic photonic crystal structures fabricated in Laboratory for Photonics, Institute of Physics, Belgrade. Padé approximants are numerical tool that can be used to accelerate the convergence of a slowly converging sequence.
3
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Surface Modification of Metallic Targets with Ultrashort Laser Pulses

76%
Gakovic B., Stasic J., Petrovic S., Radak B., Krmpot A., Jelenkovic B., Trtica M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
611-613
EN
Interaction of pulsed femtosecond Ti:sapphire laser (160 fs), operating at high repetition rate (75 MHz) at 800 nm, with nickel-based superalloy Inconel 600 and tungsten-titanium (WTi) target was studied. The WTi target was in form of thin film deposited on silicon substrate. Low laser fluence of maximum 50 mJ/cm^{2} had modified the target surface during irradiation/exposure time of seconds or minutes. The radiation absorbed from the laser beam generates at the surface a series of effects, such as direct material vaporization, formation of clusters, etc. Morphological features of the targets can be summarized as: (a) intensive removal of material and crater appearance; (b) creation of nanostructures; (c) microcracking, etc. Ablation of Inconel 600 surface is effective, resulting in formation of holes with small diameter ( ≤ 10 μm) and relatively large depth ( ≤ 50 μm). In case of WTi target/thin film, the surrounding rim is not so expressed, and crater depths are lower. It can be concluded that the average laser power of the order of watts, pulse energies of the order of nanojoules and high repetition rates (MHz range) can successfully modify metallic materials.
4
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All-Optical Magnetometer Based on Resonant Excitation of Rubidium Atoms by Frequency Modulated Diode Laser Light

64%
Cartaleva S., Karaulanov T., Petrov N., Slavov D., Vaseva K., Yanev A., Mijailovic M., Grujic Z., Jelenkovic B.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
871-876
EN
Magnetic field and its gradient measurements based on coherent population trapping resonances at the D_1 line of ^{87}Rb are performed by means of coupling two ground-state Zeeman sublevels belonging to different hyperfine levels to a common excited state. Two coherent laser fields with frequency difference of 6.8 GHz are used. They are produced by direct current modulation of a diode laser. The resonance splitting and broadening caused by the applied magnetic field is measured by scanning the laser modulation frequency around the ground-state hyperfine frequency.
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