Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/785
Title: Full utilization of semi-Dirac cones in photonics
Authors: Kurt, Hamza
Yasa, Utku G.
Turduev, Mirbek
Giden, İbrahim Halil
200103
Keywords: Negative Refraction
Crystals
Metamaterial
Realization
Emission
Point
Zero-refractive-index
Issue Date: 16-May-2018
Publisher: American Physical Society
Source: Yasa, U. G., Turduev, M., Giden, I. H., & Kurt, H. (2018). Full utilization of semi-dirac cones in photonics. Physical Review B, 97(19) doi:10.1103/PhysRevB.97.195131
Abstract: In this study, realization and applications of anisotropic zero-refractive-index materials are proposed by exposing the unit cells of photonic crystals that exhibit Dirac-like cone dispersion to rotational symmetry reduction. Accidental degeneracy of two Bloch modes in the Brillouin zone center of two-dimensional C2-symmetric photonic crystals gives rise to the semi-Dirac cone dispersion. The proposed C2-symmetric photonic crystals behave as epsilon-and-mu-near-zero materials (eff≈0, μeff≈0) along one propagation direction, but behave as epsilon-near-zero material (eff≈0, μeff≠0) for the perpendicular direction at semi-Dirac frequency. By extracting the effective medium parameters of the proposed C4- and C2-symmetric periodic media that exhibit Dirac-like and semi-Dirac cone dispersions, intrinsic differences between isotropic and anisotropic materials are investigated. Furthermore, advantages of utilizing semi-Dirac cone materials instead of Dirac-like cone materials in photonic applications are demonstrated in both frequency and time domains. By using anisotropic transmission behavior of the semi-Dirac materials, photonic application concepts such as beam deflectors, beam splitters, and light focusing are proposed. Furthermore, to the best of our knowledge, semi-Dirac cone dispersion is also experimentally demonstrated for the first time by including negative, zero, and positive refraction states of the given material. © 2018 American Physical Society.
URI: https://journals.aps.org/prb/pdf/10.1103/PhysRevB.97.195131
https://hdl.handle.net/20.500.11851/785
ISSN: 24699950
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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