Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Crystal" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 16
Tytuł:
Channel drop filter based on photonic crystal ring resonator
Autorzy:
Alipour-Banaei, H.
Jahanara, M.
Mehdizadeh, F.
Powiązania:
https://bibliotekanauki.pl/articles/174022.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
optical filter
ring resonator
quality factor
Opis:
Photonic crystal ring resonators are promising candidates for realizing all optical filters with acceptable transmission efficiency and quality factor values. In this paper, by putting a hexagon-shaped structure at the middle of on 7 × 7 square cavity we created a ring resonator structure and designed a channel drop filter. The drop wavelength of our filter is at 1550.4 nm, with transmission efficiency and quality factor equal to 94% and 707, respectively. Our structure is composed of dielectric rods immersed in air. Because in this kind of structures the dominant band gap is in TM mode, all of our simulations have been done in TM mode. The total footprint of our filter is 199.4 μm2, which makes it suitable for all optical integrated circuits.
Źródło:
Optica Applicata; 2018, 48, 4; 601-608
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Narrow transmission mode in one-dimensional symmetric defective photonic crystal containing metamaterial and high Tc superconductor
Autorzy:
Srivastava, Sanjeev K.
Aghajamali, Alireza
Powiązania:
https://bibliotekanauki.pl/articles/173630.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
photonic band gap
transmission spectra
transmission mode
defect mode
metamaterial
negative index material
superconductor photonic crystal
Opis:
We theoretically investigate the properties of narrow transmission mode (defect mode) within the reflection band in one-dimensional symmetric defective photonic crystal containing double negative metamaterial and high temperature superconductors. The transmittance spectrum of the proposed structure is obtained by using the characteristic or transfer matrix method. The results show that by increasing the thickness of air defect, transmission mode shifts towards the lower frequency side. But when the thickness of a superconductor layer is increased, transmission mode shifts towards the high frequency side. Further, the effect of temperature variation of superconducting defect on the defect mode has been investigated and found that when the temperature of superconducting layer increases the frequency of defect mode is red shifted. The shift in frequency has smaller value in the lower temperature region than in the higher temperature region, even if the change in temperature is same. Finally we have discussed the effect of variation of thickness on the defect mode by using the double negative metamaterial as defect layer in place of superconductor layer. The result shows that we get two modes for smaller thickness of double negative layer but only a single mode for larger thickness.
Źródło:
Optica Applicata; 2019, 49, 1; 37-50
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An all optical majority gate using nonlinear photonic crystal based ring resonators
Autorzy:
Poursaleh, Amir
Andalib, Alireza
Powiązania:
https://bibliotekanauki.pl/articles/175120.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
majority gate
photonic crystal
Kerr effect
ring resonator
Opis:
Optical logics will play a crucial role in the next generation all optical data processing networks. Therefore an all optical majority gate will be designed by using nonlinear photonic crystal ring resonators. For realizing the proposed structure we need three nonlinear resonant rings. In order to make nonlinear resonant rings, we used chalcogenide glass as the dielectric material for the dielectric rods. The output port of the proposed structure will be active only when two or three logic input ports are active. The rise and fall time values of the proposed structure are about 2 and 1 ps, respectively. The total footprint of the proposed structure is about 1287 μm2.
Źródło:
Optica Applicata; 2019, 49, 3; 487-498
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Four channel optical demultiplexer based on L2 photonic crystal microcavity
Autorzy:
Ammari, Merzoug
Benmerkhi, Ahlem
Bouchemat, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/2172853.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
cavity
waveguide
quality factor
demultiplexer
FDTD
filter
crosstalk
Opis:
The wavelength demultiplexing is a particularly important function in integrated optics and can be realized using photonic crystals. The aim is to extract accurately the wavelengths in a data flux. In this work, we investigate a new topologies of wavelength demultiplexing based on two-dimensional photonic crystals constituted of dielectric rods spread in a square network. The studied demultiplexer is based on optical filters with optimized parameters in order to extract four different wavelengths in the vicinity of frequencies corresponding to communication windows. It was found that the crosstalk between the structure channels of the demultiplexer are in the range of –19.19 and – 44.1 dB and the channel spacing is equal to 0.96 nm. The simulation results presented in this paper are performed and analyzed using the FDTD method.
Źródło:
Optica Applicata; 2022, 52, 4; 613--625
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Designing ultra-fast all-optical full-subtractor using the photonic crystal structure
Autorzy:
Pakrai, Forogh
Soroosh, Mohammad
Ganji, Jabbar
Powiązania:
https://bibliotekanauki.pl/articles/2202769.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
full subtractor
nonlinear ring resonator
optical Kerr effect
photonic crystal
Opis:
In this paper, a photonic crystal-based structure for an all-optical full-subtractor has been proposed. The structure includes six nonlinear resonant rings to transmit the incoming optical waves toward the output ports. Using the different radii for nonlinear rods made the possibility of the dropping operation for different amounts of optical intensities. The nonlinear rods are made of a doped-glass with an optical Kerr coefficient of 10–15 m2/W. To calculate the components of the optical waves throughout the structure, the finite-difference time-domain method has been used. The simulation results prove the correct functionality of the proposed structure. Besides, the maximum rise time of the device is equal to 2 ps. The contrast ratio and the area of the structure are around 8.08 dB and 2790 μm2, respectively.
Źródło:
Optica Applicata; 2023, 53, 1; 99--109
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical self-phase modulation using a new photonic crystal coupled-cavity waveguide
Autorzy:
Bahadori-Haghighi, S
Ghayour, R
Powiązania:
https://bibliotekanauki.pl/articles/173977.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
slow light
coupled-cavity waveguide
self-phase modulation
Opis:
In this paper, self-phase modulation of an optical pulse using a new photonic crystal coupled-cavity waveguide is simulated and analyzed. The structure of the new coupled-cavity waveguide is introduced and its advantage over the previous type of coupled-cavity waveguide is discussed. In order to obtain a high group index over a large bandwidth and benefit from the slow light phenomenon, the group index and group velocity dispersion parameter curves of the guided mode are calculated. Finally, the transient simulation of the structure is performed using a finite-difference time-domain method. The calculated required length of the coupled-cavity waveguide for a maximum phase shift of π is about 31 μm. Spectral broadening of the optical pulse as a result of self-phase modulation is also presented and discussed.
Źródło:
Optica Applicata; 2014, 44, 1; 29-38
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
All optical binary ASK demodulator using photonic crystal based nonlinear ring resonator
Autorzy:
Narimanzadeh, Mahsa
Andalib, Alireza
Powiązania:
https://bibliotekanauki.pl/articles/174652.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
amplitude shift keying
ASK
optical demodulator
delay time
Opis:
In this paper we will propose and design an all optical amplitude shift keying demodulator using a photonic crystal based nonlinear ring resonator. The proposed structure will be designed such that it can generate digital 0 and 1 based on the amplitude of the input signal. The working mechanism is based on controlling the optical behavior of the resonant ring using optical intensity. The proposed structure was simulated using plane wave expansion and finite difference time domain methods. The simulation results show that the rise and fall times for the proposed structure are 0.5 and 0.1 ps, respectively.
Źródło:
Optica Applicata; 2020, 50, 1; 61-68
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflected and transmitted powers of electromagnetic waves through a ferrite-dielectric photonic crystal
Autorzy:
Ubeid, M. F.
Shabat, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/411684.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
damping coefficient
electromagnetic waves
frequency
photonic crystal
reflection
transmission
Opis:
In this work, reflection and transmission of electromagnetic wave by a periodic ferrite-dielectric photonic crystal are investigated theoretically and numerically. The ferrite material is described and its main parameters are given in detail. After the construction of the problem, the reflection and transmission coefficients are derived in a closed form by a transfer matrix method. The reflected, transmitted, and loss powers of the crystal are calculated using these coefficients. In the numerical results the mentioned powers are computed and illustrated as a function of frequency, angle of incidence, dielectric thickness, and applied magnetic field intensity when the damping coefficient changes.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 86-98
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Special optical communication filter based on Thue-Morse photonic crystal structure
Autorzy:
Alipour-Banaei, H.
Serajmohammadi, S.
Mehdizadeh, F.
Hassangholizadeh-Kashtiban, M.
Powiązania:
https://bibliotekanauki.pl/articles/173823.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
Thue-Morse structure
optical filter
transfer matrix method
TMM
Opis:
In this paper we proposed a novel narrowband optical filter for wavelength division multiplexing applications. Due to their high transmission efficiency and very narrowband properties, we used the 5th generation Thue-Morse structure for designing our proposed filter. But novelty of our work is introducing another ID photonic crystal structure as a defect structure into the Thue-Morse structure in order to create pass band inside the photonic band gap of the Thue-Morse structure. All of the simulations and calculations have been done using the transfer matrix method. The most interesting property of this filter is that by increasing the number of the periods of the ordinary 1D photonic crystal, the number of the pass bands increases.
Źródło:
Optica Applicata; 2016, 46, 1; 145-152
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new design of a 4-channel optical demultiplexer based on photonic crystal ring resonator using a modified Y-branch
Autorzy:
Fallahi, V.
Seifouri, M.
Powiązania:
https://bibliotekanauki.pl/articles/174726.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
ring resonator
optical filter
optical demultiplexer
photonic band gap
Opis:
In this paper, we propose a new structure to design a 4-channel optical demultiplexer using a modified Y-branch structure with 4 hexagonal photonic crystal ring resonators. A new optical filter with a high transfer coefficient and quality factor has been introduced and designed in the present paper using a hexagonal photonic crystal ring resonator, which has then been used to design a 4-channel optical demultiplexer. The proposed demultiplexer has an average transfer coefficient of 95.5% and a high quality factor of 4164.6. It also has a channel spacing of 2.75 nm and a spectral width of 0.4 nm. The maximum and minimum crosstalk values of the channels are –10.5 and –36.5 dB, respectively. To study the photonic band structure, the plane wave expansion method has been used and the finite-difference time-domain method has also been used to analyze the optical behavior of the structure.
Źródło:
Optica Applicata; 2018, 48, 2; 191-200
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel proposal for all-optical XOR/XNOR gate using a nonlinear photonic crystal based ring resonator
Autorzy:
Asghari, Mehrnoush
Moloudian, Gholamhosein
Hassangholizadeh-Kashtiban, Mahdi
Powiązania:
https://bibliotekanauki.pl/articles/173268.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
optical logics
XOR gate
XNOR gate
Kerr effect
Opis:
Optical logic gates are very important structures required for creating all-optical digital signal processing systems. Optical XOR and XNOR gates can be used for designing optical adders and optical comparators, respectively. In this paper we proposed a novel structure which can be used for simultaneous implementation of optical XOR and XNOR logic gates. The proposed structure was designed using a nonlinear photonic crystal ring resonator. The delay time for XOR and XNOR gates are 1.7 and 3 ps, respectively.
Źródło:
Optica Applicata; 2019, 49, 2; 283-291
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-objective optimization of dielectric layer photonic crystal filter
Autorzy:
Yang, H.
Huang, C.
Meng, S.
Powiązania:
https://bibliotekanauki.pl/articles/174482.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
filter
photonic crystal
weighting factors method
response surface methodology
RSM
Opis:
The weighting factors method and the response surface methodology are used to achieve multi-objective optimization of a dielectric layer photonic crystal filter. The size of period and the transmission quantity are considered simultaneously and a multi-objective optimization model of filter is established, which takes the size of period and transmission quantity to be minimized in stop-band as objectives. Global approximate expressions of the objective and the constraint functions are found by response surface methodology. Then the weighting factors method is employed to convert the model into a quadratic programming model and the optimal parameters can be obtained using sequence quadratic programming. Examples provide the optimized results in three different weight coefficients. The effect of the weighting factors on the value of the objective function is also discussed. Results show that the present method is precise and efficient for multi-objective optimization of a dielectric layer photonic crystal filter.
Źródło:
Optica Applicata; 2017, 47, 1; 29-40
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved low channel spacing high quality factor four-channel demultiplexer based on photonic crystal ring resonators
Autorzy:
Talebzadeh, R.
Soroosh, M.
Mehdizadeh, F.
Powiązania:
https://bibliotekanauki.pl/articles/175084.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal
photonic band gap
shell-type ring resonator
quality factor
crosstalk
Opis:
In this paper, we propose a compact structure to realize the demultiplexing operation for dense wavelength division multiplexing communication systems using improved shell-type ring resonators in a photonic crystal structure. The cross-section of the structure is 790 μm2 and is desirable for integration based on popular planar technology. To improve power transmission coupling efficiency, we introduce the phase matching condition between ring resonators and waveguides; the results exhibit near 100% transmission efficiency. To obtain a high quality factor, we use interior lower refractive indices spheres inside the ring resonators as the mirrors; a quality factor as high as 15497 is achieved. The average pass bands of channels are near 0.1 nm, and the channel spacing is approximately 0.6 nm. The wavelengths of the demultiplexer are 1549, 1549.7, 1550.3 and 1550.9 nm. The crosstalk is between –14 and –29 dB, and the mean value of the crosstalk is –18.39 dB.
Źródło:
Optica Applicata; 2016, 46, 4; 553-564
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of optical properties of Si photonic crystals
Autorzy:
Gamalath, K. A. I. L. W.
Settinayake, W. A. S. C.
Powiązania:
https://bibliotekanauki.pl/articles/412423.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
photonic crystal
waveguides
power divider
finite difference time domain method
yee lattice approach
Opis:
To investigate optical properties of Si photonic crystal waveguides, a mathematical model was set up. Finite difference time domain method was used to calculate the Maxwell’s equations numerically. For the evolution of the electromagnetic fields in the photonic crystals, simulations were done for a small lattices using Yee lattice approach. The properties of a waveguide and a power divider were investigated for 3λx 3λ photonic crystal formed from Si circular rods in air for telecommunication wavelength 1.55 μm. The model developed was satisfactory in predicting the behaviour of light in linear photonic crystals.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 87-98
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical simulations and optimization of highly sensitive biosensor for cancer cell detection
Autorzy:
El Mouncharih, Abdelkarim
Takassa, Rabi
Farkad, Omar
Tchenka, Abdelaziz
Ibnouelghazi, El Alami
Abouelaoualim, Driss
Powiązania:
https://bibliotekanauki.pl/articles/27310106.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
refractive index sensor
sensitivity
cancer cell
photonic crystal
finite difference time domain
FDTD
Opis:
In this work, using the two-dimensional finite difference time domain method, we are theoretically studying the optical properties of a two-dimensional photonic crystal biosensor based on silicon rods arranged as a square structure in an air bottom with two waveguides and a nanocavity. For this purpose, six different cells are infiltrated into the point defect. These six cells are Jurkat, HeLa, PC-12, MDA-MB-231, MCF-7, and basal cells. As a result, we have successfully detected cancer and benign cases of these cells through resonance peaks in the transmission spectrum. We evaluated the sensitivity, quality factor, detection limit, and figure of merit at different values for sensing region radius for optimization purposes. We report that we observed the maximum sensitivity of 1350 nm/RIU at 0.15 μm for the basal cell. Finally, the proposed biosensor can be a miniaturized structure with extreme sensitivity in cancer cell detection models.
Źródło:
Optica Applicata; 2023, 53, 3; 407--418
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies