الفهرس 
Abstractيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
To sum up our work:
First, we have demonstrated the optical properties of a 1D NC PC design based on our theoretical methodology. In particular, Maxwell-Garnett model and transfer matrix method as well represent the main elements of our theoretical verifications. The numerical investigations demonstrate the dispersion properties of NC layer for both cases of two and three phases that could be of interest in adjust the different characteristics of the PBGs. Also, the position, width and the number of the produced PBGs can be controllable by varying some of the design parameters such as NC layer thickness, the permittivity of the background material, filling fraction, radius of Ag-NPs and number of carriers of ITO-NPs. By choosing properly the optimized values of these parameters, our proposed design can be used in different applications such as reflectors, optical filters, and optical switches. In addition, it could be applicable to act as tunable absorber in visible light.
Then, based on using the theoretical methods, we have demonstrated the optical characteristics of a 1D PC design composed of metamaterial and NC layers. Our theoretical verifications are mostly based on the Maxwell-Garnett model and the transfer matrix approach. The numerical investigation of the dispersion properties of the NC layer may be useful in managing the various characteristics of PBGs. The variation of the design factors such as the MM layer thickness, the background material permittivity, the filling fraction, the incident angle for TE polarization, and the NC layer thickness can also regulate the position and the width of the obtained PBG. PCs based on DNG metamaterials have been the focus of a wide range of fields and applications in recent years, including optics, photonics, optoelectronics, communications, imaging, sensing, and reflectors, polarization filters, and splitters. The proposed structure has the potential to significantly improve the quality and efficiency of the aforementioned fields.
Also, we studied the optical properties of a 1D PC structure containing hyperbolic metamaterials (HMMs) for optical filtering purposes. The Maxwell-Garnett model and the transfer matrix method are used for the theoretical verifications. The management of the various PBG parameters can be controlled from the numerical investigations of the dispersion properties of the HMM layer. The angle-dependent omnidirectional PBG is demonstrated in this study in a PC structure made of dielectric materials and HMMs created by subwavelength dielectric-NC multilayers. Variation of the design factors such as HMM layer thickness, background material permittivity, filling fraction and incidence angle for TM and TE polarization can also regulate the position and width of the obtained PBG. The proposed structure has the potential to significantly improve the quality and efficiency of the aforementioned optical and photonic fields as it can be used in enhancing the properties of optical multi-channel filters.
Finally, we theoretically examined the NIR transmittance characteristics of a one-dimensional quasi-periodic PC. The proposed structure is made up of a superconductor (Nb) and HMM based on the Fibonacci sequence. In our design, the properties of resonance peaks with angle stability are theoretically calculated by using the characteristic matrix model and the effective medium theory. The effects of thickness, operating temperature, and the type of superconductor layer on the properties of the resonance peaks are studied. The permittivity of (Nb) at various operating temperatures and the permittivity of HMM at different filling ratios are also investigated. Moreover, the number of Fibonacci sequences and type of each sequence have proved to sustain a pronounced effect on the number and position of the resonance peaks. The proposed structure has the ability to enhance the quality and performance of the preceding fields and can be used as an optical pass/stop band filter for NIR applications.