Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/743
Title: Asymmetric light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure
Authors: Bor, E.
Turduev, Mirbek
Yasa, U. G.
Kurt, Hamza
Staliunas, Kestutis
200103
Keywords: Zero-refractive-index
Optical diode
Conical dispersion
Compact
Realization
Design
Issue Date: 10-Dec-2018
Publisher: American Physical Society
Source: Bor, E., Turduev, M., Yasa, U. G., Kurt, H., & Staliunas, K. (2018). Asymmetric light transmission effect based on an evolutionary optimized semi-Dirac cone dispersion photonic structure. Physical Review B, 98(24), 245112.
Abstract: In this paper, we present the numerical and experimental demonstration of asymmetric light transmission by a compact photonic crystal (PC) structure, which sustains semi-Dirac cone dispersion. The semi-Dirac point is obtained by exploiting plane-wave expansion method in a rectangular unit cell of a cylindrical dielectric rod, forming a PC structure. The preselected part of the corresponding PC structure is optimized via differential evolution to maximize the transmission efficiency in one direction, and to minimize in the opposite direction. In this regard, finite-difference time-domain method is integrated with the optimization algorithm to numerically design a compact PC structure with asymmetric light transmission effect. The detailed numerical investigation of the optimized PC structure is represented, and the experiments in the microwave regime are performed to verify the numerical results. The experimentally measured transmission efficiency reaches 78% for one direction, whereas in the opposite direction it reduces to 11%. The physical mechanism of asymmetric light transmission is related to differences of the projection of the wave incident from both directions into the eigenmodes of the photonic structure. © 2018 American Physical Society.
URI: https://journals.aps.org/prb/pdf/10.1103/PhysRevB.98.245112
https://hdl.handle.net/20.500.11851/743
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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