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Title: Photonic crystals based on aperiodic dielectric multilayers for optical filtering
Authors: Yasa, Utku Görkem
Figen, Ziya Gürkan
Kurt, Hamza
Keywords: Photonic crystals
aperiodic dielectric gratings
bragg gratings
multilayer dielectric structures
multiple photonic bandgaps
optical filters
Issue Date: Apr-2019
Publisher: Institute of Physics Publishing
Source: Yasa, U. G., Figen, Z. G., and Kurt, H. (2019). Photonic crystals based on aperiodic dielectric multilayers for optical filtering. Journal of Optics, 21(4), 045101.
Abstract: In this study, we demonstrate two different methods to generate one-dimensional photonic crystals (PCs) based on aperiodic dielectric gratings and investigate their optical filtering characteristics. The first grating design approach relies on a function formed by the summation of two cosine functions that exhibit different spatial frequencies corresponding to predefined reciprocal lattice vectors (RLVs) and hence generating a grating function by placing the refractive index layer boundaries at the zero-crossing locations of this function. The second design approach starts with the discretization of the total grating thickness with layers of equal thicknesses and each layer's refractive index is selected to maximize the magnitude of the Fourier transform of the grating function at the spatial frequency locations corresponding to predefined RLVs. The non-periodic dielectric multilayers are exposed to time domain calculations utilizing finite-difference time domain method. Using numerical calculations, transmission properties of the designs are investigated and the free adjustability of the photonic bandgap locations in the spectra is demonstrated for both methods. With these advantages, both methods prove to be practical solutions for the design of optical filters based on one-dimensional PCs utilizing aperiodic index modulation.
ISSN: 2040-8978
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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