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Title: Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides
Authors: Giden, İbrahim Halil
 Yılmaz, D.
 Turduev, Mirbek
Kurt, Hamza
 Çolak, E.
 Özbay, Ekmel
Keywords: Photonic crystals
optical diode
Issue Date: Jan-2014
Source: Giden, I. H., Yilmaz, D., Turduev, M., Kurt, H., Colak, E., & Ozbay, E. (2014). Theoretical and experimental investigations of asymmetric light transport in graded index photonic crystal waveguides. Applied Physics Letters, 104(3), 031116.
Abstract: To provide asymmetric propagation of light, we propose a graded index photonic crystal (GRIN PC) based waveguide configuration that is formed by introducing line and point defects as well as intentional perturbations inside the structure. The designed system utilizes isotropic materials and is purely reciprocal, linear, and time-independent, since neither magneto-optical materials are used nor time-reversal symmetry is broken. The numerical results show that the proposed scheme based on the spatial-inversion symmetry breaking has different forward (with a peak value of 49.8%) and backward transmissions (4.11% at most) as well as relatively small round-trip transmission (at most 7.11%) in a large operational bandwidth of 52.6 nm. The signal contrast ratio of the designed configuration is above 0.80 in the telecom wavelengths of 1523.5-1576.1 nm. An experimental measurement is also conducted in the microwave regime: A strong asymmetric propagation characteristic is observed within the frequency interval of 12.8 GHz-13.3 GHz. The numerical and experimental results confirm the asymmetric transmission behavior of the proposed GRIN PC waveguide. © 2014 AIP Publishing LLC.
ISSN: 36951
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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