Zero-n gap design via modulation of hexagonal photonic crystal lattice

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Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2017

Student: SHAHRAM MORADI

Co-Supervisor: EMRE YÜCE, SERDAR KOCAMAN

Abstract:

We study the effect of disorder in the lattice on a photonic band diagram and apply it to form a superlattice in order to examine negative refractive index and finally obtain zero-ñ gap. In addition, the novelty of suggested modulated PhC introduces new ways of controlling light through the complicated lattices. The aim of this approach is to have a deep understanding of dispersion characteristics dependence on the lattice structure by comparing modified structures with conventional lattice types. We design a disordered modulated hexagonal lattice in which the positions of holes vary in the orthogonal direction of applied light direction and study its influence on both effective refractive index and photonic band structure through numerical simulations. The results of this approach are promising enough to utilize them in various applications of on-chip integrated circuits. We applied this class of suggested structure in one particular superlattice to gain zero-ñ gap for the sake of comparison with the reported structures recently.