Dr. Imad I. Hasan Profile

Dr. Imad I. Hasan

at Univ of Ottawa

SPIE Involvement:

Author

Publications (8)

SPIE Journal Paper | 23 July 2014

Slow light propagation in tunable nanoscale photonic crystal cavity filled with nematic liquid crystal

Kaisar Khan, Khaled Mnaymneh, Hazem Awad, Imad Hasan

OE, Vol. 53, Issue 10, 102705, (July 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.10.102705

KEYWORDS: Liquid crystals, Waveguides, Light wave propagation, Slow light, Photonic crystals, Refractive index, Crystals, Silicon, Molecules, Polarization

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Proceedings Article | 11 October 2013 Paper

Slow light in photonic crystal cavity filled with nematic liquid crystal

Kaisar Khan, Khaled Mnaymneh, Hazem Awad, Imad Hasan, Trevor Hall

Proceedings Volume 8915, 89151R (2013) https://doi.org/10.1117/12.2036423

KEYWORDS: Photonic crystals, Liquid crystals, Waveguides, Light wave propagation, Refractive index, Slow light, Crystals, Silicon, Radio propagation, Electrodes

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Proceedings Article | 24 October 2012 Paper

Free space and waveguide Talbot effect: phase relations and planar light circuit applications

H. Nikkhah, Q. Zheng, I. Hasan, S. Abdul-Majid, T. Hall

Proceedings Volume 8412, 841217 (2012) https://doi.org/10.1117/12.2001169

KEYWORDS: Phased array optics, Waveguides, Brain-machine interfaces, Free space optics, Matrices, Free space, Phase measurement, Hybrid optics, Switches, Convolution

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Proceedings Article | 8 September 2011 Paper

Performance comparison between silicon-on-insulator curved waveguides and corner turning mirrors

Qi Zheng, Imad Hasan, DeGui Sun, Sawsan Abdul-Majid, Trevor Hall

Proceedings Volume 8007, 80070Z (2011) https://doi.org/10.1117/12.905699

KEYWORDS: Waveguides, Wave propagation, Silicon, Photonic integrated circuits, Polarization, Mirrors, Mirror structures, Optical fibers, Photonics, Optical testing

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Proceedings Article | 18 November 2010 Paper

Performance improvement to silicon-on-insulator waveguide directional-coupler based devices

DeGui Sun, Imad Hasan, Sawsan Abdul-Majid, Rob Vandusen, Qi Zheng, Ali Hussien, Chunxia Wang, Zhongming Hu, T. Garry Tarr, Trevor Hall

Proceedings Volume 7847, 78470F (2010) https://doi.org/10.1117/12.871723

KEYWORDS: Waveguides, Polarization, Silicon, Integrated optics, Directional couplers, Mirrors, Optical switching, Active optics, Photonic integrated circuits, Tolerancing

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Proceedings Article | 16 November 2010 Paper

An intrinsic limitation to silicon-on-insulator waveguide Mach-Zehnder interference-based electro-optic devices

DeGui Sun, Sawsan Abdul-Majid, Zhongming Hu, Rob Vandusen, Imad Hasan, T. Garry Tarr, Trevor Hall

Proceedings Volume 7847, 78470P (2010) https://doi.org/10.1117/12.871637

KEYWORDS: Modulation, Waveguides, Modulators, Switches, Absorption, Adaptive optics, Refractive index, Silicon, Integrated optics, Optics manufacturing

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Proceedings Article | 18 May 2010 Paper

Design, simulation, and fabrication of a 90° SOI optical hybrid based on the self-imaging principle

Sawsan Abdul-Majid, Imad Hasan, Przemek Bock, Trevor Hall

Proceedings Volume 7719, 77190E (2010) https://doi.org/10.1117/12.854735

KEYWORDS: Brain-machine interfaces, Waveguides, Hybrid optics, Signal detection, Polarization, Receivers, Device simulation, Waveguide modes, Integrated optics, Optical design

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This paper introduces a compact 90º optical hybrid, built on small size SOI waveguide technology .This optical hybrid is a critical component of a potentially low-cost coherent optical receiver design developed within the frame of our Optical Coherent Transmission for Access Network Extensions (OCTANE) project. In previous recent work, 90º optical hybrids were realized in SOI rib waveguide technology with 4 μm top silicon and a rib height of approximately 2 μm. In this paper, we introduce a compact 90º optical hybrid, built on small size SOI waveguide technology (1.5 μm SOI -based rib waveguide, with 0.8μm rib height). The proposed device consists of multimode interferometers (MMIs) connected in such a way that four different vector additions of a reference signal (local oscillator) and the signal to be detected are obtained. At the outputs, the hybrid provides four linear combination of the signal with the reference which differs by a relative phase shift of the reference of 90º. The four output signals are detected by a pair of balanced receivers to provide in-phase and quadrature (I&Q) channels. The phase differences arise naturally from the self imaging property of a MMI. The key elements of the 90º optical hybrid, including a 2×2 MMI, a 4×4 MMI, and polarization diversity configuration have been designed and simulated, using the numerical mode solving tool FIMMPROB. The 2×2 and 4×4 MMI had overall lengths of 701μm and 3712.5μm lengths respectively. Tapers are used to couple adiabatically single mode waveguides to the entrance and exit ports of the MMI to assure correct operation by avoiding coupling to the higher order transverse modes allowed at the entrance and exit ports of the MMI. The simulation results at 1550nm show polarization independence and phase errors between the ports of less than 0.03 degrees. Currently the design is in fabrication at the Canadian Photonics Fabrication Center with the support of CMC Microsystems and experimental results will be subject to a further report.

Proceedings Article | 14 May 2010 Paper

Wireless enabled multi gas sensor system based on photonic crystals

Hazem Awad, Imad Hasan, K. Mnaymneh, Sawsan Majid, Trevor Hall, Ivan Andonovic

Proceedings Volume 7726, 77260K (2010) https://doi.org/10.1117/12.854841

KEYWORDS: Photonic crystals, Sensors, Gas sensors, Waveguides, Refractive index, Gases, Photomasks, Finite-difference time-domain method, Telecommunications, System integration

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Showing 5 of 8 publications

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