Autor: Gharaati, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modeling of thermal tunable multichannel filter using defective metallic photonic crystals
Autorzy:: Gharaati, A.
Zare, Z.
Powiązania:: https://bibliotekanauki.pl/articles/174165.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: photonic crystals
temperature dependent refractive index
multichannel filter
defective mode
Opis:: The transmission spectra of one dimensional metallic photonic crystal containing defects are studied using a transfer matrix method. We consider silver as a defect layer with a refractive index dependent on wavelength and temperature simultaneously. Since the loss factor of silver is the function of temperature, we should find a structure that has sharp transmission peaks to model a filter. We present the structure with a coupled defect. It is found that the number of transmission resonant peaks is equal to the number of coupled defects and they are tunable with temperature and incident angle.
Źródło:: Optica Applicata; 2017, 47, 4; 611-619
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Investigation of Band Gap Width in Ternary 1D Photonic Crystal with Left-Handed Layer
Autorzy:: Zare, Z.
Gharaati, A.
Powiązania:: https://bibliotekanauki.pl/articles/1195623.pdf
Data publikacji:: 2014-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.70.Qs
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2014, 125, 1; 36-38
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Calculation of Anderson Localization Length by Using Generalized Quantum Kicked Rotator Analytically
Autorzy:: Gharaati, A.
Bahadori, F.
Boroumandi, H.
Powiązania:: https://bibliotekanauki.pl/articles/1490736.pdf
Data publikacji:: 2012-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.15.Rn
Opis:: We use the generalized quantum kicked rotator model and its relation with the Anderson model. We calculate localization length analytically. For this reason, we consider a one-dimensional rotator model for a special potential whose an impulse is applied at equal time intervals, T. We obtain time evolution of the wave function between two successive impulses by an evolution matrix. We change this model to the tight-binding model for a particle on a one-dimensional lattice. At special case the wave function is localized, and then we derive the Anderson localization length for the system analytically.
Źródło:: Acta Physica Polonica A; 2012, 121, 1; 30-32
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Calculation of Temperature Distribution in Eccentric Multi Core Diode Pumped Fiber Lasers by Green Function Method
Autorzy:: Gharaati, A.
Elahi, P.
Jafari, M.
Powiązania:: https://bibliotekanauki.pl/articles/1791240.pdf
Data publikacji:: 2009-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.55.Wd
42.60.Da
Opis:: In this paper, the temperature distribution in fiber lasers pumped by multi diode bars located in out-of-fiber axis has been investigated semi-analytically. For this reason, we consider heat deposition in fiber lasers due to pump and the nonhomogeneous heat conduction equation has been solved by using Green function method in a cylindrical coordinate system. Our model has been used for single, double and multi pumped configuration and, for a typical fiber lasers, the results have been plotted and discussed.
Źródło:: Acta Physica Polonica A; 2009, 116, 4; 566-569
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Photonic band gap in negative ternary refractive indices of two-dimensional photonic crystal
Autorzy:: Gharaati, A
Mohamadebrahimi, L
Roozitalab, Z
Powiązania:: https://bibliotekanauki.pl/articles/174931.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: negative refraction
two dimensional photonic crystals
metamaterials
band gaps
Opis:: In this paper, we study propagation of electromagnetic wave in negative ternary refractive indices of two-dimensional photonic crystals. We consider two structures with two concentric cylindrical rod and shell in which one of them has negative refractive indices, in positive dielectric background. It is shown that by increasing the diameter of the rod in both structures, we can obtain more and wider band gaps in comparison with the structures in which there is no negative refractive index materials. This increase is more considerable in the first structure, in which the rod has a negative refractive index, in comparison with the second one, where the rod has a positive refractive index.
Źródło:: Optica Applicata; 2014, 44, 4; 637-648
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Propagation of Spatial Solitons with Nonlinear Kerr Effect in Thermal Medium
Autorzy:: Gharaati, A.
Elahi, P.
Cari, S.
Powiązania:: https://bibliotekanauki.pl/articles/2047846.pdf
Data publikacji:: 2007-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.65.Sf
42.65.Tg
42.65.Wi
Opis:: In this paper, the propagation and behavior of spatial solitons of inhomogeneous nonlinear Schrödinger equation in thermal medium will be investigated analytically. The theoretical model is established by considering the change of refractive index of medium due to heat deposition of entrance beam. The soliton like solution in such thermal medium was derived. The effect of input pump power and beam radius on the behavior of solitons will be studied finally.
Źródło:: Acta Physica Polonica A; 2007, 112, 5; 891-896
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Informacja