Mr. Abdessamad Benhsaien Profile

Abdessamad Benhsaien

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Publications (5)

Proceedings Article | 11 October 2013 Paper

Metamaterial Lüneburg waveguide lenses for switch fabric on-a-chip applications

H. Nikkhah, A. Benhsaien, R. Maldonado-Basilio, S. Abdul-Majid, T. Hall

Proceedings Volume 8915, 89150O (2013) https://doi.org/10.1117/12.2035640

KEYWORDS: Waveguides, Metamaterials, Silicon, Refractive index, Lenses, Photonic crystals, Finite-difference time-domain method, Etching, Chemical species, Solids

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Optical information processing has traditionally been demonstrated using 3D free-space optical systems employing bulk optical components. These systems are bulky and unstable due to the stringent alignment tolerances that must be met. Taking advantage of the alignment accuracy offered by planar light circuits, these issues may be overcome by confining the light in a planar slab waveguide. The limitation on scaling, consequent on the loss of one dimension is offset by the nanoscale component footprints attainable in a silicon integration platform. A key component of this free-space-opticson- a-chip concept is a waveguide lens. Waveguide lenses are of general utility but our specific application is their use to implement the complex crossover interconnections of a switch fabric. The graded refractive index of the lens is engineered by patterning the silicon layer of silicon on insulator slab waveguides into a dense distribution of cylinders; either solid (silicon) or voids (air); using a single etch step. The cylinders have variable diameters and are placed on a regular square or hexagonal grid with sub-wavelength pitch. In the case of voids, the patterned silicon may be suspended in air to form the core of a symmetric slab waveguide. Solid cylinders must be supported by the Si02 layer leading to an asymmetric waveguide of reduced effective index range. Advantageously, the patterning of the metamaterial region within the slab-waveguide requires only a single etch step. Photonic wire feeder waveguides at different positions around the lens may be used to launch light into the lenses or collect light from the lenses. A method is developed to determine the local effective media index of a periodic metamaterial in terms of the parameters of its unit cell. This method is used as a calibration to lay out a metamaterial with graded parameters. The operation of a metamaterial Lüneburg lens telescope is verified by FDTD simulations and shown to be capable of near zero insertion loss and crosstalk. The careful approximation of the graded index of the Lüneburg lens by a metamaterial introduces minimal impairments.

Proceedings Article | 11 October 2013 Paper

Multi-electrode laterally coupled distributed feedback InGaAsP/InP lasers: a prescription for longitudinal mode control

Abdessamad Benhsaien, Kais Dridi, Jessica Zhang, Trevor Hall

Proceedings Volume 8915, 891510 (2013) https://doi.org/10.1117/12.2042729

KEYWORDS: Electrodes, Photonic integrated circuits, Wavelength tuning, Lithography, Continuous wave operation, Hole burning spectroscopy, Etching, Scanning electron microscopy, Semiconducting wafers, Waveguides

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Proceedings Article | 11 October 2013 Paper

Characterization of an asymmetric InGaAsP/InP multi-quantum well semiconductor optical amplifier

Julie Nkanta, Ramon Maldonado-Basilio, Abdessamad Benhsaien, Kaisar Khan, Sawsan Abdul-Majid, Jessica Zhang, Trevor Hall

Proceedings Volume 8915, 89150R (2013) https://doi.org/10.1117/12.2036828

KEYWORDS: Polarization, Photonics, Quantum wells, Semiconductor optical amplifiers, Laser damage threshold, Cladding, Analytical research, Microsystems, Semiconducting wafers, Optoelectronic devices

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Proceedings Article | 4 March 2013 Paper

Narrow-linewidth three-electrode regrowth-free semiconductor DFB lasers with uniform surface grating

Kais Dridi, Abdessamad Benhsaien, Akram Akrout, Jessica Zhang, Trevor Hall

Proceedings Volume 8640, 864009 (2013) https://doi.org/10.1117/12.2005368

KEYWORDS: Electrodes, Semiconductor lasers, Etching, Photonic integrated circuits, Waveguides, Semiconductors, Lithography, Optical design, Cladding, Continuous wave operation

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Proceedings Article | 24 October 2012 Paper

1.55µm laterally coupled ridge-waveguide DFB lasers with third-order surface grating

Kais Dridi, Abdessamad Benhsaien, Jessica Zhang, Trevor Hall

Proceedings Volume 8412, 84121R (2012) https://doi.org/10.1117/12.2001459

KEYWORDS: Etching, Waveguides, Photonic integrated circuits, Lithography, Cladding, Photomasks, Photonics, Continuous wave operation, Interferometry, Optical design

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