Browsing by Author "Dossou, Kokou"

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Browsing by Author "Dossou, Kokou"

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  • Sturmberg, B.C.P.; Dossou, Kokou; Botten, Lindsay; Asatryan, Ara; Poulton, Christopher; Mcphedran, Ross; De Sterke, C (Optical Soc Amer, 2013)
    Aperiodic Nanowire (NW) arrays have higher absorption than equivalent periodic arrays, making them of interest for photovoltaic applications. An inevitable property of aperiodic arrays is the clustering of some NWs into ...
  • Dossou, Kokou; Packirisamy, Muthukumaran; Fontaine, Marie (Optical Society of America, 2005)
    Typically the grating problem is formulated for TE and TM polirizations by using, respectively, the electric and magnetic fields aligned with the grating wall and perpendicular to the plane of incidence, and this leads to ...
  • Lawrence, Felix; Botten, Lindsay; Dossou, Kokou; De Sterke, C (American Institute of Physics, 2008)
    We show that no consistent scalar definition of impedance is generally possible for photonic crystals. Instead, we present a rigorous semianalytic matrix definition of impedance for square lattice photonic crystals, defined ...
  • Ha, Sangwoo; Sukhorukov, Andrey; Dossou, Kokou; Botten, Lindsay; De Sterke, C; Kivshar, Y (Optical Soc Amer, 2009)
    We demonstrate that the spatial profiles of both propagating and evanescent Bloch modes in a periodic structure can be extracted from a single measurement of an electric field at the specified optical wavelength. We develop ...
  • Dossou, Kokou; Botten, Lindsay (Elsevier, 2012)
    A three-dimensional finite element method (FEM) for the analysis of plane wave diffraction by a bi-periodic slab is described and implemented. A scattering matrix formalism based on the FEM allows the efficient treatment ...
  • Brownless, John; Mahmoodian, Sahand; Dossou, Kokou; Lawrence, Felix; Botten, Lindsay; De Sterke, C (Optical Society of America, 2010)
    We investigate dispersion curves of coupled waveguides in hexagonal lattices. We find that their coupling coefficients change magnitude and sign along the BZ and that the modes here are no longer odd and even modes.
  • Brownless, John; Mahmoodian, Sahand; Dossou, Kokou; Lawrence, Felix; Botten, Lindsay; De Sterke, C (Optical Society of America, 2010)
    We investigate the modes of coupled waveguides in a hexagonal photonic crystal. We find that for a substantial parameter range the coupled waveguide modes have dispersion relations exhibiting multiple intersections, which ...
  • Ha, Sangwoo; Sukhorukov, Andrey; Dossou, Kokou; Botten, Lindsay; Lavrinenko, Andrei; Chigrin, Dmitry; Kivshar, Yuri (Optical Society of America, 2008)
    We suggest a novel and general approach to the design of photonic-crystal directional couplers operating in the slow-light regime. We predict, based on a general symmetry analysis, that robust tunneling of slow-light pulses ...
  • Mahmoodian, Sahand; Sipe, J.; Poulton, Christopher; Dossou, Kokou; Botten, Lindsay; Mcphedran, Ross; De Sterke, C. (American Physical Society, 2012)
    We derive a frequency-domain-based approach for radiation from double-heterostructure cavity (DHC) modes. We use this to compute the quality factors and radiation patterns of DHC modes. The semianalytic nature of our method ...
  • Mcphedran, Ross; Dossou, Kokou; Botten, Lindsay; Asatryan, Ara; De Sterke, C; Chen, Shigang; Brnovic, Jovana (Optical Society of America, 2005)
  • Dossou, Kokou; Botten, Lindsay; De Sterke, C; Mcphedran, Ross; Asatryan, Ara; Chen, Swee; Brnovic, Jovana (Elsevier Science Bv, 2006)
    We use two-dimensional simulations to study the design of tapers to provide efficient, low reflection coupling between a waveguide in a two-dimensional photonic crystal (PC) and free space. We find that, largely independent ...
  • De Sterke, C; Dossou, Kokou; White, Thomas; Botten, Lindsay; Mcphedran, Ross (Optical Society of America, 2009)
    We show that efficient coupling between fast and slow photonic crystal waveguide modes is possible, provided that there exist strong evanescent modes to match the waveguide fields across the interface. Evanescent modes are ...
  • White, Thomas; Botten, Lindsay; De Sterke, C; Dossou, Kokou; Mcphedran, Ross (Optical Society of America, 2008)
    We consider the coupling into a slow mode that appears near an inflection point in the band structure of a photonic crystal waveguide. Remarkably, the coupling into this slow mode, which has a group index ng>1000, can be ...
  • De Sterke, C; Walker, Jacqueline; Dossou, Kokou; Botten, Lindsay (Optical Soc Amer, 2007)
    We study light coupling between two photonic crystal wave-guides, one of which supports slow light. We show theoretically that a short photonic crystal waveguide between the two that need to be coupled, can lead to a ...
  • Mahmoodian, Sahand; Dossou, Kokou; Poulton, Christopher; Mcphedran, Ross; Botten, Lindsay; De Sterke, C (Optical Society of America, 2010)
    We present a new method for designing mode fields of 3D photonic crystal heterostructure cavities. The method is several orders of magnitude faster than existing numerical methods and enables rapid design of heterostructure ...
  • Dossou, Kokou; Botten, Lindsay; Wilcox, Stuart; Mcphedran, Ross; De Sterke, C; Nicorovici, Nicolae; Asatryan, Ara (Elsevier Science Bv, 2007)
    An exact theory for modelling modes of generalised defects in 2D photonic crystals (PCs) with a genuinely infinite cladding is presented. The approach builds on our fictitious source superposition method for simple defects ...
  • Dossou, Kokou; Byrne, Michael; Botten, Lindsay (Elsevier, 2006)
    We consider the calculation of the band structure and Bloch mode basis of two-dimensional photonic crystals, modelled as stacks of one-dimensional diffraction gratings. The scattering properties of each grating are calculated ...
  • Mahmoodian, Sahand; Sipe, John; Poulton, Christopher; Dossou, Kokou; Botten, Lindsay; Mcphedran, Ross; De Sterke, C (Optical Society of America, 2012)
    We present a first-principles method to compute radiation properties of ultra-high quality factor photonic crystal cavities. Our Frequency-domain Approach for Radiation (FAR) can compute the far-field radiation pattern and ...
  • Lawrence, Felix; Botten, Lindsay; Dossou, Kokou; Mcphedran, Ross; De Sterke, C (American Institute of Physics, 2012)
    We present a flexible method that can calculate Bloch modes, complex band structures, and impedances of two-dimensional photonic crystals from scattering data produced by widely available numerical tools. The method ...
  • Belhadj, N; Larochelle, Sophie; Dossou, Kokou (Optical Soc Amer, 2004)
    The effective index change and form birefringence are calculated in UV-exposed fibers using a high-order vectorial finite element method. The birefringence is compared in optical fibers with and without photosensitive inner ...