Yazar "Kurt, Hamza" seçeneğine göre listele

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    Öğe
    Broadband one way propagation via dielectric waveguides with unequal effective index
    (Institute of Electrical and Electronics Engineers Inc., 2014) Öner, Bilgehan Barış; Üstün, Kadir; Kurt, Hamza; Okyay, Ali Kemal; Turhan Sayan, Gönül
    We present an efficient approach for broad band one way propagation of light by parallel and unequal dielectric waveguides leading different effective phase shifts. Three dimensional numerical simulations show that 30% operating bandwidth is achieved. © 2014 IEEE.
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    Öğe
    Efficient and broadband guided wave one-way mode-order conversion with theoretical and numerical analysis
    (Optical Society of American (OSA), 2013) Üstün, Kadir; Kurt, Hamza
    In this article, an efficient method of asymmetric conversion of guided modes is investigated. From a basic excitation consisting of (mainly) the lowest-order mode of the input multimode strip waveguide, we achieve a conversion efficiency of ~60% on average, in the forward propagation case, while the backward propagation is suppressed below 10%. The analytical formulation is based on electromagnetic wave theory with orthogonality relations. Affirmative results between the theoretical and numerical findings based on time and frequency domain analysis are observed. The results of this study will increase the ease of implementing an optical isolator if the breaking time-reversal symmetry could be achieved by nonlinear optics or magneto-optic configurations. © 2013 Optical Society of America.
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    Öğe
    Large bandwidth mode order converter by differential waveguides
    (Optical Society of American (OSA), 2015) Öner, Bilgehan Barış; Üstün, Kadir; Kurt, Hamza; Okyay, Ali Kemal; Turhan Sayan, Gönül
    In this article, we propose a large bandwidth mode-order converter design by dielectric waveguides with equal lengths but different cross-sectional areas. The efficient conversion between even and odd modes is verified by inducing required phase difference between the equal length waveguides of different widths. Y-junctions are composed of both tapered mode splitter and combiner to connect mono-mode waveguide to multi-mode waveguide. The converted mode profiles at the output port show that the device operates successfully at designed wavelengths with wide bandwidth. This study provides a novel technique to implement compact mode order converters and direction selective/sensitive photonic structures. © 2015 Optical Society of America.