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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
|
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-Pade Approximation in Analysis of Holographic Diffraction Gratings

100%
Sevic D., Savic-Sevic S., Pantelic D., Marinkovic B.
Acta Physica Polonica A
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2013
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vol. 124
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issue 4
619-621
EN
The diffraction gratings, fabricated in our laboratory, were presented and analyzed by atomic force microscopy in earlier publications. In this paper we apply the Fourier-Pade approximation on our data previously analyzed by fast Fourier transform, proving advantages of using the Fourier-Pade approximation for spectral analysis of structural properties of some optical materials.
3
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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.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 4
647-648
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.
4
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Measurement of Beet Root Extract Fluorescence Using TR-LIF Technique

76%
Rabasovic M., Sevic D., Terzic M., Savic-Sevic S., Muric B., Pantelic D., Marinkovic B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
570-572
EN
Laser induced fluorescence is a powerful spectroscopic technique commonly used to study the structure and internal state distributions in molecules of biological interest. Betanin (C_{24}H_{26}N_{2}O_{13}) is a specific violet betacyanin and the most prominent pigment in the red beet root where it contributes to 75-95% of the total visible color. Our method of excitation of the beet root extract is based on the tunable (320 nm to 475 nm) Nd:YAG laser system. Fluorescence images of beet root extract excited at 320, 340, 360 and 400 nm were obtained. The fluorescence is observed in range from 580 nm to 660 nm. The influence of the solution concentrations on the fluorescence intensity is also analyzed.
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