Browsing by Author "Palaz, Selami"

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    Multi - purpose photonic crystal-based sensor design by finite element method
    (Institute of Physics Publishing Ltd., 2022) Ozer, Zafer; Palaz, Selami; Mamedov, Amirullah M.
    Due to the full reflection of electromagnetic waves, certain frequencies cannot propagate in photonic crystals. Waveguides and resonators obtained by removing some rods in photonic crystals with band gap are sensitive to small changes in refractive index. Using this sensitivity, photonic crystal-based sensors can be designed for different purposes. The refractive index changes when the sample with different refractive index is placed in the detection area.Sensors sensitive to refractive index change, detect samples with different refractive indices placed in the detection area by shifting the resonant wavelength of the sensor. In this study, photonic crystal-based multi-purpose sensor was designed and analyzed by finite element method. The sensitivity and quality factor of the sensors were examined.
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    Spectral scalability and optical spectra of fractal multilayer structures: FDTD analysis
    (Springer Verlag, 2017) Şimsek, Şevket; Palaz, Selami; Mamedov, Amirullah M.; Özbay, Ekmel
    An investigation of the optical properties and band structures for the conventional and Fibonacci photonic crystals (PCs) based on SrTiO3 and Sb2Te3 is made in the present research. Here, we use one-dimensional SrTiO3- and Sb2Te3-based layers. We have theoretically calculated the photonic band structure and transmission spectra of SrTiO3- and Sb2Te3-based PC superlattices. The position of minima in the transmission spectrum correlates with the gaps obtained in the calculation. The intensity of the transmission depths is more intense in the case of higher refractive index contrast between the layers. © 2016, Springer-Verlag Berlin Heidelberg.