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  1. 6 Rudziński A.

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1
Content available remote

Investigation of Band Gap Width in Ternary 1D Photonic Crystal with Left-Handed Layer

100%
Zare Z., Gharaati A.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 1
36-38
EN
In this paper, we investigate the variation of band gap width in a ternary 1D photonic crystal with a left-handed layer versus variation of thicknesses and refractive index of second layers. We study these variations in two states, normal and oblique incidents for both TE and TM polarizations. We observe that the variations of band gap width versus thickness of layers are sensitive to the refractive index of second layers. For oblique incident both of variations are shifted towards the large/small frequencies by increasing the incident angles in TE/TM polarization, respectively.
2
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Effect of Disorder on the Electromagnetic Properties of Photonic Crystals

100%
Meisels R., Kuchar F.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
769-776
EN
Real photonic crystals suffer from imperfections due to inaccuracies in manufacture. Therefore these imperfections have to be taken into account as disorder in the lattice structure when the properties of photonic crystals are simulated. Here, in particular the effect of positional and radial disorder on the density-of-states and on the mode structure of electromagnetic waves in a photonic crystal is studied for 2D systems.
3
Publication available in full text mode
Content available

Analytic Expressions for Electromagnetic Field Envelopes in a 1D Photonic Crystal

100%
Rudziński A.
Acta Physica Polonica A
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2007
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vol. 111
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issue 3
323-333
EN
The subject of this paper is the derivation of expressions describing envelopes of electromagnetic fields inside a 1D photonic crystal. The presented approach is based on an effective resonator model, which treats each layer of the photonic crystal as a resonant cavity. The model is analytic and allows one to derive parameters characterizing the photonic crystal and express electric and magnetic fields as their function. It is general enough to take into account defects of the crystal or even be used for an aperiodic structure. In the end of the paper, a few results are provided for the case of a source of radiation inside a photonic crystal along with a short discussion.
4
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Orthonormalization of Substrate and Guided Modes in Effective Resonator Model of Dielectric Multilayer Structure

100%
Rudziński A.
Acta Physica Polonica A
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2007
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vol. 112
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issue 3
505-511
EN
In this paper, the orthonormal sets of substrate and guided modes are derived from electromagnetic field distributions of a dielectric multilayer structure, which have been obtained using the effective resonator model, presented in Acta Phys. Pol. A, 111, 323 (2007).
5
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Orthonormalization of Radiation Modes in Effective Resonator Model of Dielectric Multilayer Structure

100%
Rudziński A.
Acta Physica Polonica A
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2007
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vol. 112
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issue 3
495-504
EN
In this paper, the orthonormal mode set is derived from electromagnetic field distributions of a dielectric multilayer structure, which have been obtained using the effective resonator model, presented in Acta Phys. Pol. A, 111, 323 (2007)
6
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Enhancement of Photonic Crystal All-Optical Diode Efficiency with a Subwavelength Layer

100%
Jamshidi-Ghaleh K., Safari Z., Tanavar R.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
212-214
EN
In this paper, the effect of a subwavelength thin layer on all-optical diode action in a one-dimensional photonic crystal is investigated. The photonic multilayer structure is considered as (BA)^6 (AB)^6 C(AABB)^6, where layers A and B are nonlinear and linear materials respectively, and C is a thin layer with positive or negative-index material. The results are shown that by introducing a thin layer with different optical properties the all-optical diode efficiency is controllable. In our numerical results, the transmission contrast of the structure, without the thin layer is obtained as 0.63, with a positive index material layer nearly zero and with a negative index material thin layer about 0.75.
7
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Orthonormalization of Radiation Modes in Effective Resonator Model of Dielectric Multilayer Structure ERRATUM

63%
Rudziński A.
Acta Physica Polonica A
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2007
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vol. 112
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issue 6
1327-1328
EN
This paper contains an erratum to [A. Rudziński, Acta Phys. Pol. A 112 , 495 (2007)]
8
Publication available in full text mode
Content available

Photonic Crystal Fibers

63%
Buczynski R.
Acta Physica Polonica A
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2004
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vol. 106
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issue 2
141-167
EN
Photonic crystal fibers are a new class of optical fibers. Their artificial crystal-like microstructure results in a number of unusual properties. They can guide light not only through a well-known total internal reflection mechanism but using also photonic bandgap effect. In this paper different properties possible to obtain in photonic crystal fibers are reviewed. Fabrication and modeling methods are also discussed.
9
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Some Mathematical Properties of Effective Resonator Model of 1D Dielectric Multilayer Structure

63%
Rudziński A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 3
660-663
EN
This paper presents a review of mathematical properties of effective resonator model of 1D dielectric multilayer structure. It constitutes a mathematical supplement to the previous papers, in which the model has been described.
10
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Light-Induced Modification of 3D Photonic Band Structure Detected by Means of Photoreflection

63%
Kapitonov A., Kachan S., Ponyavina A., Gaponenko S., Bogomolov V., Prokofiev A., Sitarek P., Misiewicz J.
Acta Physica Polonica A
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1999
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vol. 95
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issue 3
335-342
EN
Porous synthetic opal possessing a three-dimensional photonic band structure of semimetallic type was impregnated with polycrystalline CdS. The photonic stop band in (111) direction was examined by means of photoreflection technique. Under cw laser excitation of semiconductor inclusions the reflectance of the system changes indicating a modification of photonic band structure. A possible mechanism is discussed. Numerical simulations within the framework of quasicrystalline approximation are given.
11
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Orthonormalization of Substrate and Guided Modes in Effective Resonator Model of Dielectric Multilayer Structure ERRATUM

63%
Rudziński A.
Acta Physica Polonica A
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2008
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vol. 113
|
issue 6
1709
EN
This note contains an erratum to [A. Rudziński, Acta Phys. Pol. A 112, 505 (2007)].
12
Content available remote

Investigation of Photonic Band Gaps of One-Dimensional Heterostructure Magnetic Photonic Crystals

51%
Ansari N., Tehranchi M.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
378-380
EN
Multiple structures in one-dimensional photonic crystals have great potentials for ultrawide omnireflectors and tunable switches. In this paper, we study the propagation of electromagnetic waves in a one-dimensional heterostructure magnetic photonic crystal for both TE and TM incidence polarizations by means of the transfer matrix method. Results show that by stacking two magnetic photonic crystals as a heterostructure magnetic photonic crystal the omnidirectional total reflection frequency range for any polarization enlarged due to overlapping of photonic band gaps of both magnetic photonic crystals. Omnidirectional band gaps in the heterostructure magnetic photonic crystal is enhanced rather than that in a single magnetic photonic crystal.
13
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Fabrication of SbSI Photonic Crystals

51%
Starczewska A., Szperlich P., Nowak M., Bednarczyk I., Bodzenta J., Szala J.
Acta Physica Polonica A
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2014
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vol. 126
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issue 5
1118-1120
EN
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.
14
Content available remote

Enhanced Electro-Optic Modulation Performance in Optical Buffers by Slowing Light in Optimized Photonic Crystal Slab Structures

51%
Bagci F., Akaoglu B.
Acta Physica Polonica A
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2014
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vol. 125
|
issue 2
611-614
EN
Slow light holds the key to advanced optical buffering and time-domain optical signal processing technologies. Photonic crystal based optical buffers are particularly attractive due to their nanoscale size, room temperature operation, and enhanced field dependent nonlinear response associated with the presence of slow light. In this study, the slow light and electro-optic modulation characteristics of a line-defect Si photonic crystal slab with triangular arrangement of holes filled with an electro-optic polymer (n = 1.6) are investigated by three-dimensional plane-wave expansion and finite-difference time-domain methods. The first rows adjacent to the line-defect are shifted gradually in the direction of light propagation and a slow light region with a high group index below the light-line is obtained for a shifting amount between 0.22a and 0.27a. For the photonic crystal configuration with 0.22a shifted rows, under modulated voltage change, the average group index is found to be decreasing with an increase in the bandwidth. The results show that the low group velocity supports a large delay time in a small modulated voltage variation. A linear change of group index with modulated voltage is obtained and the modulation sensitivity of central wavelength is obtained as 9.45 nm/V for a delay line length of 0.5 mm. Almost the same buffer capacity and bit length are found which provides the control of delay time flexibly while keeping the buffer capacity and the bit length almost unchanged.
15
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Improved Light Extraction Efficiency by Photonic Crystal Arrays on Transparent Contact Layer Using Focused Ion Beams

51%
Wu G., Tsai B., Kung S., Wu C.
Acta Physica Polonica A
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2011
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vol. 120
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issue 1
140-143
EN
Nitride-based thin-film materials have become increasingly important for the high brightness light-emitting diode applications. The improvements in light extraction and lower power consumption are highly desired. Although the internal quantum efficiency of GaN-based LED has been relatively high, only a small fraction of light can be extracted. In this study, a new design of two-dimensional photonic crystal array has been prepared on the top transparent contact layer of indium-tin oxide film to improve the light extraction efficiency using focused ion beam. The acceleration voltage of the Ga dual-beam nanotechnology system SMI 3050 was 30 kV and the ion beam current was 100 pA. The cylindrical air holes had the diameter of 150 nm and depth of 100 nm. The micro photoluminescence analysis results showed that the light output intensity could be 1.5 times of that of the non-patterned control sample. In addition, the structural damage from the focused ion beam drilling of GaN step could be eliminated. The excellent I-V characteristics have been maintained, and the external light extraction efficiency would be still improved for the LED devices.
16
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Waveguiding Effect in GaAs 2D Hexagonal Photonic Crystal Tiling

51%
Jovanović Ð., Gajić R., Djokić D., Hingerl K.
Acta Physica Polonica A
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2009
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vol. 116
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issue 1
55-57
EN
In this paper we theoretically study (with plane wave expansion and finite-difference time-domain models) waveguiding effect of the 2D hexagonal dielectric photonic crystal tiling. The structure is made of GaAs dielectric rods in air. We perform the calculations of the band structures, equi-frequency contours and electromagnetic propagation through the new type of the photonic crystal and self-collimation waveguides making it possible for application.
17
Content available remote

Study of the Absorption in Solar Cells with 2D Photonic Crystals

51%
Ouanoughi A., Hocini A., Khedrouche D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1205-1207
EN
In this work, we design via numerical simulation the absorption properties of silicon nanohole arrays of vertically aligned square lattice arrays with lattice constants varying from 300 nm to 400 nm, using the finite difference time-domain method (FDTD). The silicon (Si) is chosen as prototype material for this study due to better understanding of the material properties and widely available optical data. The parameters for photonic crystals are optimized through computer simulations to obtain the maximum absorption and path length enhancement. We investigated the performance of the considered structure and determined the geometrical parameters that allow a better absorption.
18
Content available remote

Anizotropy of Photoconductivity in BiOCl (X=Cl, Br, I) Single Crystals

51%
Komanicky V., Bunda S., Botko M., Bunda V.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
274-275
EN
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.
19
Content available remote

Mode Conversion in 2D Magneto Photonic Crystals Made of SiO₂/ZrO₂ Matrix Doped With Magnetic Nanoparticles

51%
Kahlouche A., Hocini A., Khedrouche D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1208-1210
EN
In this work, we theoretically study the use of magneto-photonic crystal for amplification of the magneto-optical effects, to improve the merit factor. A two dimensional magneto-photonic waveguide device, formed by a triangular lattice of air holes, embedded in SiO₂/ZrO₂ matrix doped with magnetic nanoparticles, is used to study the influence of the volume fraction (VF %) on the mode conversion. We have used the beam propagation method (BPM) to simulate the efficiency coefficient in a planar 2D magneto-photonic waveguide. The influence of VF % on propagation length is studied, and an enhancement in Faraday rotation in 2D magneto photonic crystal is achieved, which proves the ability of the structure to produce magneto-photonic crystal isolator.
20
Content available remote

Plasmonic Bragg Reflector and Tamm Plasmon Polaritons in Metal-Dielectric Superlattices

51%
Vukovic S.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
678-680
EN
The properties of electromagnetic waves in two-dimensional periodic structures created by alternating metal and dielectric layers are investigated. The structure is assumed to be finite in the direction normal to the layers and infinite in other directions. Dispersion relations for both TE- and TM-polarized eigenmodes of metal-dielectric superlattice have been analyzed. It is demonstrated that the dispersion show typical properties of optic Tamm states.
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