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Wyświetlanie 1-15 z 17
Tytuł:
Holographic Fabrication of Periodic Microstructures in Dichromated Pullulan
Autorzy:
Savić-Šević, S.
Pantelić, D.
Gajić, R.
Isić, G.
Powiązania:
https://bibliotekanauki.pl/articles/2047886.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.40.-i
42.70.Ln
42.70.Qs
Opis:
Photonic crystal structures are fabricated in dichromated pullulan by the holographic technique. Relief structures of photonic lattices with rectangular, rhombic, and hexagonal arrays of peaks and holes are obtained. The structures have periodicities of the order 1.1μm and depth of about 50 nm.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1079-1082
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray Holography with a Position Sensitive Detector
Autorzy:
Lausi, A.
Kopecky, M.
Busetto, E.
Savoia, A.
Powiązania:
https://bibliotekanauki.pl/articles/2030559.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
07.85.-m
42.40.-i
Opis:
Integrating photon collection on position sensitive detectors used in combination with an absorption filter offers many advantages in X-ray fluorescence holography experiments: (i) the simultaneous recording of the full hologram allows us to overcome most of the difficulties - notably the large number of experimental points and the precision requirements - that make the practical realization of the measurement of holographic patterns very difficult and time demanding also when using powerful synchrotron radiation sources; (ii) the high angular resolution and the very precise detection of intensities make the reconstruction of images of distant as well as light atoms possible; (iii) area detectors are readily available at most crystallography dedicated beamlines at synchrotron radiation sources, so there is no need of complex, dedicated instrumentation. As an example, the hologram of a CoO single crystal recorded on an imaging plate is reported, evidencing the images of atoms located up to more than 7Å far from the emitter and also of the light oxygen atoms.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 621-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imaging and Patterning on Nanometer Scale Using Coherent EUV Light
Autorzy:
Wachulak, P.
Marconi, M.
Menoni, C.
Rocca, J.
Fiedorowicz, H.
Bartnik, A.
Powiązania:
https://bibliotekanauki.pl/articles/1539095.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.40.Ht
42.40.-i
42.55.Vc
Opis:
Extreme ultraviolet (EUV) covers wavelength range from about 5 nm to 50 nm. That is why EUV is especially applicable for imaging and patterning on nanometer scale length. In the paper periodic nanopatterning realized by interference lithography and high resolution holographic nanoimaging performed in a Gabor in-line scheme are presented. In the experiments a compact table top EUV laser was used. Preliminary studies on using a laser plasma EUV source for nanoimaging are presented as well.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 403-407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Analysis of Associative Properties of Fourier versus Walsh Digital Holograms
Autorzy:
Derzhypolskyy, A.
Melenevskyy, D.
Gnatovskyy, A.
Powiązania:
https://bibliotekanauki.pl/articles/2047891.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Kq
42.30.Va
42.30.Sy
42.40.-i
Opis:
A digital implementation of the Fourier holography scheme with identical reference and signal beams is considered. Investigations of the properties of this scheme were reported on in a number of papers. At the same time a concept of virtual optics is widely used in data encryption and data processing, whereas digital implementation of the Fourier holography scheme may be provided using not only discrete Fourier transform. Another discrete digital transform may be used as soon as it has several properties similar to the Fourier transform. The Walsh transform is the subject to consider in this work. A comparison of digital Fourier and Walsh versions of the named holographic scheme is conducted by means of their associative properties. Considered is the retrieving of information stored in the hologram using parts of different amounts of the original data. Comparison is provided with the two types of data stored: a raster image representing visual information and an image representing a set of data bits. Comparable parameters are the mean image contrast for visual data image and the bit detection accuracy for a set of data bits.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1101-1106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Holographic Recording with the Use of Bistable Centers in CdF$\text{}_{2}$
Autorzy:
Koziarska, B.
Langer, J. M.
Ryskin, A. I.
Shcheulin, A. S.
Suchocki, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934064.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.40.Lx
78.50.Ge
78.20.Ci
42.40.Ht
Opis:
We show that bistability and metastability of In and Ga impurities in CdF$\text{}_{2}$ crystals can be efficiently used in writing volume holographic gratings. Phototransformation of these impurities from the localized to the hydrogenic state leads to a large change of the local polarizability of the host, and thus a significant change of the refractive index. While CdF2:In can be used only at low temperatures (below 150 K), CdF2:Ga crystals are suitable for room temperature recording.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1010-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anizotropy of Photoconductivity in BiOCl (X=Cl, Br, I) Single Crystals
Autorzy:
Komanicky, V.
Bunda, S.
Botko, M.
Bunda, V.
Powiązania:
https://bibliotekanauki.pl/articles/1368699.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Ja
42.70.Qs
72.40.+w
Opis:
Oxyhalides of bismuth BiOX (X = Cl, Br, I) are very interesting materials which find various applications as X-ray luminescent screens, as anti-Stokes converters, photocatalyst, usual luminophors and as photoconductive analyzer of linear polarized radiation in the 0.24 - 1.2 μm spectral region. The great interest for these materials is strongly related to the influence of dimensionality on the behaviour of physical properties (they are 2D structured materials). Bismuth oxyhalides are one of the V-VI-VII group compound semiconductors belonging to the tetragonal system. The structure of BiOX is known to have a layered structure, which is constructed by the combination of the halide ion layer and the bismuth oxygen layer. We present results of the study of photoconductivity spectra anisotropy of the BiOX single crystals.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 274-275
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Shot Noise in Avalanche Photodiodes
Autorzy:
Kocak, F.
Kilic, A.
Tapan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1398762.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Lc
29.40.Wk
02.70.Uu
Opis:
PbWO₄ crystal-Hamamatsu S8148 avalanche photodiode (APD) assembly has been used in the barrel section of the CMS electromagnetic calorimeter. The shot noise of the photodiode is one of the important parameters for the energy resolution of the crystal-APD system. The major source of this noise is the statistical variations in the rate at which primary charge carriers are generated and recombine. Thus, the shot noise varies with position of the primary charge carriers generated in photodiode. In this work, the shot noise properties of the Hamamatsu S8148 APD structure and zinc sulfide-silicon (ZnS-Si) isotype heterojunction APD structure have been compared for the PbWO₄ photons. Calculations were made with a Single Particle Monte Carlo simulation technique.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 721-723
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Bistability Induced by Additive Colored Noise in the Exciton-Biexciton System
Autorzy:
Gonţia, I. I.
Rotaru, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/1933412.pdf
Data publikacji:
1995-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.40.+j
05.70.Fh
42.65.Pc
Opis:
This paper predicts optical bimodality induced by external additive noise with a finite bandwidth, in the exciton-biexciton system.
Źródło:
Acta Physica Polonica A; 1995, 87, 6; 911-917
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of SbSI Photonic Crystals
Autorzy:
Starczewska, A.
Szperlich, P.
Nowak, M.
Bednarczyk, I.
Bodzenta, J.
Szala, J.
Powiązania:
https://bibliotekanauki.pl/articles/1376062.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
77.84.-s
78.40.Fy
Opis:
Semiconducting ferroelectric antimony sulfoiodide (SbSI) photonic crystals were fabricated. The $SiO_{2}$ nanospheres were synthesized and gravity sedimented to obtain opal matrices. These opals were infiltrated with melted SbSI and etched in HF acid to produce inverted SbSI opals.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1118-1120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semiconductor Materials for Ultrafast Photoswitches
Autorzy:
Coutaz, J.-L
Powiązania:
https://bibliotekanauki.pl/articles/2035566.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.60.-q
85.60.Dw
72.20.-i
72.40.+w
72.80.Ey
42.65.Re
Opis:
This paper gives a review of semiconductor materials that are used to fabricate ultrafast photoswitches. The optoelectrical response of the switches is first described with simple models, from which the material requirements are deduced. The basic principles of the required material properties - ultrashort free carrier lifetime and high mobility, high dark resistivity, and high field breakdown - are explained. Then, the most popular ultrafast semiconductors are listed, together with their characteristics. A special emphasis is put on low-temperature grown GaAs. Finally, two applications of these ultrafast materials are presented, namely antennae for terahertz radiation and all-optical nonlinear devices.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 495-512
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Temperature Field Distribution in Large-Size Paratellurite Crystals Applied in Acousto-Optic Devices
Autorzy:
Tretiakov, S.
Grechishkin, R.
Kolesnikov, A.
Kaplunov, I.
Yushkov, K.
Molchanov, V.
Linde, B.
Powiązania:
https://bibliotekanauki.pl/articles/1383374.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.79.-e
65.40.-b
07.20.-n
Opis:
Temporal and spatial distribution of temperature field was studied in operating acousto-optic devices on base of large-size paratellurite crystals. The study was carried out in real time by means of thermal imaging technique. Dynamics of heat release in a hot deflector and a hot tunable filter was examined at different frequencies and driving electric power levels applied to piezoelectric transducers. The study was also based on measurements of standing wave ratio and analysis of the Smith charts.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 72-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Undulator-Like Radiation and N² Effects in Semiconductor Microstructures with Grating
Autorzy:
Tralle, I.
Zięba, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402586.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.-m
42.50.Gy
73.61.Ey
73.40.kp
73.50.Fq
Opis:
In the article the cooperative N²-effects are considered, that is the radiation whose power is ım N², where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effects are the result of combining two effects: the Gunn-effect in GaAs and undulator-like radiation, or "pumping wave" acting on the electrons and which is the result of undulator field, while the second is the backward effect of radiation which is produced by electrons moving within such microundulator. It is very probable that the effects can be used for the developing of a new semiconductor-based room temperature source of the THz-radiation.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 228-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Undulator-Like Radiation and Cooperative Phenomenon in Semiconductor Microstructure with Grating
Autorzy:
Tralle, I.
Zięba, P.
Powiązania:
https://bibliotekanauki.pl/articles/1490209.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.-m
42.50.Gy
73.61.Ey
73.40.kp
73.50.Fq
Opis:
In the article the cooperative $N^2$-effect is considered, that is the radiation whose power is ım $N^2$, where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effect is the result of combining two other effects, Gunn-effect in GaAs and undulator-like radiation which can be produced by means of microstructure with grating (microundulator). It is very probable that the effect can be used for the developing of a new semiconductor-based room temperature source of the THz radiation.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 522-526
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of LiNbO₃-Ag Nanocomposites
Autorzy:
Bolesta, I.
Vakiv, M.
Haiduchok, V.
Kushnir, O.
Demchuk, A.
Nastyshyn, S.
Gamernyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1030943.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
71.45.Gm
81.40.-z
42.70.Mp
Opis:
The article presents the experimental results of the investigation of the absorption spectra and nonlinear refraction of the metal-dielectric nanocomposite that contains the lithium niobate pyroelectric crystal coated with the silver nanofilms on its surface. The atomic force microscopy surface research of these crystals with and without films are also provided. The nanowidth silver films impact on optical spectra and nonlinear refraction of LiNbO₃-Ag nanocomposite was analyzed depending on the sign of the side charge of the crystal, that contain nanofilms.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 860-863
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of $Pb^{2+}$ Ions in $PbF_{2}$-Doped $CaF_{2}$ Crystals
Autorzy:
Paraschiva, M.
Nicoara, I.
Stef, M.
Bunoiu, O.
Powiązania:
https://bibliotekanauki.pl/articles/1538667.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
68.35.Dv
78.20.Ci
78.40.Ha
81.10.Fq
Opis:
Calcium fluoride crystals doped with various concentrations of $PbF_{2}$ have been grown using the Bridgman technique. The optical absorption spectra reveal the characteristic UV absorption bands of the $Pb^{2+}$ ions. The distribution of the $Pb^{2+}$-ions along four crystals has been investigated using the optical absorption method. Taking into account the relationship between the optical absorption coefficient and the concentration of the impurities in the samples, the effective segregation coefficient of the $Pb^{2+}$ ions has been calculated. Our study shows that the effective segregation coefficient of the $Pb^{2+}$ ions in $CaF_{2}$ host depends on the dopant concentration, and varies between 0.85 and 1.15, for 0.5 mol%$PbF_{2}$ and 3 mol%$PbF_{2}$-doped $CaF_{2}$, respectively.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 466-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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