Adibi, Ali

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Now showing 1 - 3 of 3
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    Absorbing boundary conditions for low group velocity electromagnetic waves in photonic crystals
    (Georgia Institute of Technology, 2011-03) Askari, Murtaza ; Momeni, Babak ; Reinke, Charles M. ; Adibi, Ali
    We present an efficient method for the absorption of slow group velocity electromagnetic waves in photonic crystal waveguides (PCWs). We show that adiabatically matching the low group velocity waves to high group velocity waves of the PCW and extending the PCW structure into the perfectly matched layer (PML) region results in a 15 dB reduction of spurious reflections from the PML. We also discuss the applicability of this method to structures other than PCWs.
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    Systematic Design of Wide-Bandwidth Photonic Crystal Waveguide Bends With High Transmission and Low Dispersion
    (Georgia Institute of Technology, 2010-06) Askari, Murtaza ; Momeni, Babak ; Soltani, Mohammad ; Adibi, Ali
    We identify factors affecting transmission and dispersive properties of photonic crystal waveguide (PCW) bends, using 2-D simulations and present a method for systematic design of PCW bends to achieve high transmission and low dispersion over large bandwidths. The bends presented here have higher bandwidth and lower dispersion than bends already reported.
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    Tuning of resonance-spacing in a traveling-wave resonator device
    (Georgia Institute of Technology, 2010-04) Atabaki, Amir Hossein ; Momeni, Babak ; Eftekhar, Ali Asghar ; Hosseini, Ehsan Shah ; Yegnanarayanan, Siva ; Adibi, Ali
    In this work a traveling-wave resonator device is proposed and experimentally demonstrated in silicon-on-insulator platform in which the spacing between its adjacent resonance modes can be tuned. This is achieved through the tuning of mutual coupling of two strongly coupled resonators. By incorporating metallic microheaters, tuning of the resonance-spacing in a range of 20% of the free-spectral-range (0.4nm) is experimentally demonstrated with 27mW power dissipation in the microheater. To the best of our knowledge this is the first demonstration of the tuning of resonance-spacing in an integrated traveling-wave-resonator. It is also numerically shown that these modes exhibit high field-enhancements which makes this device extremely useful for nonlinear optics and sensing applications.