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    Wyświetlanie 1-9 z 9
    Tytuł:
    Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor
    Autorzy:
    Krmpot, A.
    Ćuk, S.
    Nikolić, S.
    Radonjić, M.
    Grujić, Z.
    Jelenković, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791239.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.70.Jz
    42.50.Gy
    42.62.Fi
    32.30.Jc
    Opis:
    Influence of two different laser beam profiles, the Gaussian and the Π (top hat) profile on the resonance line widths and amplitudes in the Hanle electromagnetically induced transparency was studied. The laser beam propagates through the vacuum Rb glass cell. Studies were done at $D_1$ line for the open $\text{}^{87}Rb:$ $F_{g}$=2 → $F_{e}$=1 transition. Hanle electromagnetically induced transparency was measured for the two beam profiles with the same total power and beam diameter and experimental results showed that Gaussian and the top hat profiles give different amplitudes and widths of the Hanle resonances. Resonances obtained from the top hat laser beam profile have lower amplitudes and higher line widths.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 563-565
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width
    Autorzy:
    Dimitrijević, J.
    Grujić, Z.
    Mijailović, M.
    Arsenović, D.
    Panić, B.
    Jelenković, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1815474.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Gy
    32.70.Jz
    Opis:
    Using the $\text{}^2S_{1//2}$ $F_g$=2→$\text{}^2P_{3//2}$ $F_e$=3 transition in $\text{}^{87}Rb$, we analyzed the interaction between the arbitrarily polarized laser light and Zeeman sublevels in the Hanle configuration. We studied theoretically and confirmed experimentally that the effect of the laser light polarization on the electromagnetically induced absorption strongly depends on the laser light power. For the same atomic transition, and for single laser light power (3 mW), it was recently shown that electromagnetically induced absorption line widths increase with polarization ellipticity and that electromagnetically induced absorption amplitude has maximum for certain laser light polarization different than linear. Here, we present results for amplitudes and widths of electromagnetically induced absorption for different laser light polarizations and for the laser light power≤ 200μW. It is verified that for small laser light power maximal electromagnetically induced absorption amplitude is for the linear polarization, whereas for larger power maximum of the electromagnetically induced absorption is at higher polarization ellipticity.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 841-845
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zeeman Coherences Narrowing due to Ramsey Effects Induced by Thermal Motion of Rubidium Atoms
    Autorzy:
    Grujić, Z.
    Mijailović, M.
    Panić, B.
    Minić, M.
    Kovačević, A.
    Obradović, M.
    Jelenković, B.
    Cartaleva, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814392.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Gy
    32.70.Jz
    Opis:
    We investigated effects of spatially separated laser fields on amplitudes and widths of electromagnetically induced transparency in M-type atomic system. We have shown narrowing of the electromagnetically induced transmission resonance and therefore enhancement of medium non-linearities that can be explained by diffusion-induced Ramsey narrowing. Depending on the polarization of two laser beams, narrow probe Hanle transmission resonance changes its sign in respect of the profile obtained when the pump laser beam is off.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 799-803
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    All-Optical Magnetometer Based on Resonant Excitation of Rubidium Atoms by Frequency Modulated Diode Laser Light
    Autorzy:
    Cartaleva, S.
    Karaulanov, T.
    Petrov, N.
    Slavov, D.
    Vaseva, K.
    Yanev, A.
    Mijailovic, M.
    Grujic, Z.
    Jelenkovic, B. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047842.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Gy
    07.55.Ge
    Opis:
    Magnetic field and its gradient measurements based on coherent population trapping resonances at the D$\text{}_{1}$ line of $\text{}^{87}$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.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 871-876
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Phonon Confinement Model in Simulation οf Raman Spectra of Nanostructured Materials
    Autorzy:
    Grujić-Brojčin, M.
    Šćepanović, M.
    Dohcević-Mitrović, Z.
    Popović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807810.pdf
    Data publikacji:
    2009-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    78.30.-j
    63.22.-m
    07.05.Tp
    Opis:
    The simulation of the Raman spectra of nanostructured materials, where the effects of frequency shift and asymmetric broadening of the Raman modes play an important role, can be very useful in systematic characterization of these materials. Use of phonon confinement model for calculating Raman spectra of different nanomaterials is considered both from the viewpoint of different confinement function and the confinement strength, as well as the dimensionality of the confinement model. The phonon dispersion relations and the choice of their approximation are also studied. The influence of particle size distribution on the shape of the calculated spectra is discussed and contributions of Gaussian and asymmetric Gaussian distribution are compared. The effects of average and inhomogeneous strain on the behavior of simulated Raman spectra are also discussed. The results of the phonon confinement model are compared to the experimental spectra of $CeO_2$ and anatase $TiO_2$ nanopowders.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 1; 51-54
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Characterization of Laser-Synthesized Anatase $TiO_{2}$ Nanopowders by Spectroscopic Ellipsometry and Photoluminescence Measurements
    Autorzy:
    Šćepanović, M.
    Grujić-Brojčin, M.
    Mirić, M.
    Dohčević-Mitrović, Z.
    Popović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795613.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    78.67.Bf
    73.22.-f
    07.60.Fs
    78.55.-m
    Opis:
    Nanosized titania $(TiO_{2})$ is synthesized by laser-induced pyrolysis using $TiCl_{4}$ as a liquid precursor. X-ray diffraction and Raman scattering confirmed anatase structure of $TiO_{2}$ nanocrystals. The dielectric function ε(ω) of $TiO_{2}$ nanopowders has been determined by spectroscopic ellipsometry in the energy range from 1.5 to 6 eV at room temperature. The features observed in ε(ω) have been fitted to analytical line shapes by using the second derivatives of experimental spectra. The energies corresponding to different interband electronic transitions have been determined. Photoluminescence measurements have been carried out in vacuum for T = 20 K and T = 300 K. Under laser irradiation with sub-band gap photon energy, anatase nanocrystals have displayed strong visible photoluminescence emission. In this broad photoluminescence band different variations of line shape and position with excitation energy and temperature are observed for nanopowders with different crystallite size, pointing out to the various electronic transitions mediated by defect levels within the band gap.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 603-606
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of ZnSe Nanolayers by Spectroscopic Ellipsometry
    Autorzy:
    Šćepanović, M.
    Grujić-Brojčin, M.
    Nesheva, D.
    Levi, Z.
    Bineva, I.
    Popović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795712.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    81.15.-z
    81.05.Dz
    78.30.-j
    07.60.Fs
    68.55.-a
    Opis:
    Single layers of ZnSe with thicknesses of 30, 40, 50, 70 and 100 nm are deposited at room substrate temperature by thermal evaporation of ZnSe powder in vacuum. The layers surface morphology has been investigated by atomic force microscopy. Structural characterization by the Raman scattering measurement revealed the existence of randomly oriented crystalline ZnSe particles in all layers, and the presence of amorphous phase in layers thinner than 100 nm. The ellipsometric measurements were performed in the range from 1.5 to 5 eV at room temperature in air. To interpret the experimental results, the Bruggeman effective medium approximation of dielectric function of ZnSe layers has been used, representing the layers as different mixtures of crystalline ZnSe (c-ZnSe), amorphous ZnSe (a-ZnSe), and voids. The assumption of polycrystalline ZnSe layers modeled as mixture of porous c-ZnSe (with volume fraction of voids ≈ 0.17) and a-ZnSe gives the best fit of ellipsometric experimental data. Single layer thicknesses similar to those expected from preparation conditions have been obtained by this fitting procedure. It has been also found that decrease in the layer thickness causes an increase of the volume fraction of a-ZnSe. Thus, c-ZnSe/a-ZnSe ratio, porosity and layer thickness obtained by spectroscopic ellipsometry, provides useful information about crystallinity and micro-/nanostructure of ZnSe nanolayers.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 708-711
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Nonstoichiometry on Optical Properties of Oxide Nanopowders
    Autorzy:
    Šćepanović, M.
    Grujić-Brojčin, M.
    Dohčević-Mitrović, Z.
    Vojisavljević, K.
    Srećković, T.
    Popović, Z. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047872.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.Bw
    73.63.Bd
    78.67.-n
    78.55.-m
    78.30.-j
    Opis:
    In this paper we illustrate the change of optical properties of mechanically activated wurtzite ZnO powder and laser synthesized anatase TiO$\text{}_{2}$ nanopowder due to the nonstoichiometry caused by mechanical activation and/or laser irradiation in vacuum. Both of the investigated materials are widely used in optoelectronics and the examination of their optical properties under different preparation and environmental conditions is of great practical interest.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1013-1018
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-Frequency Raman Spectroscopy of Pure and La-Doped $TiO_2$ Nanopowders Synthesized by Sol-Gel Method
    Autorzy:
    Šćepanović, M.
    Aškrabić, S.
    Grujić-Brojčin, M.
    Golubović, A.
    Dohčević-Mitrović, Z.
    Kremenović, A.
    Popović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807845.pdf
    Data publikacji:
    2009-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Fw
    81.07.Wx
    78.30.-j
    63.22.-m
    Opis:
    Pure and La-doped titania $(TiO_2)$ nanopowders are synthesized by sol-gel technology. The crystallite sizes determined by X-ray diffraction measurements range from 10 to 15 nm. Dependence of structural and morphological characteristics of nanopowders on synthesis conditions and $La^{3+}$ content is investigated by the Raman spectroscopy. Very intensive modes observed in the Raman spectra of all nanopowder samples are assigned to anatase phase of $TiO_2$. Additional Raman modes of extremely low intensity can be related to the presence of a small amount of brookite amorphous phase in nanopowders, which is in accordance with the results of X-ray diffraction analysis. The particle size distribution in TiO_2 nanopowders was estimated from the low frequency Raman spectra, using the fact that the phonon modes in nanosized $TiO_2$ observed in the low frequency region (ω <40 $cm^{-1}$) can be well described by the elastic continuum model, assuming that nanoparticles are of perfect spherical shape and isotropic. The nanosized particle distribution obtained by this method is used for the calculation of the frequency and shape of the most intensive $E_g$ Raman mode in anatase $TiO_2$ by the phonon confinement model. The calculated broadening of this mode, associated with the particle size distribution, coincides well with the characteristics of $E_g$ mode observed in measured Raman spectra of $TiO_2$ nanopowders. This confirms the Raman spectroscopy method as a powerful tool for determination of particle size distribution in nanosized materials.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 1; 99-102
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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