Browsing by Author "Dossou Kokou"

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Browsing by Author "Dossou Kokou"

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  • Antireflection coatings for two-dimensional photonic crystals using a rigorous impedance definition 
    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 ...
  • Bloch-Mode Extraction From Near-Field Data In Periodic Waveguides 
    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 ...
  • Coupled photonic crystal waveguide in hexagonal lattices 
    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.
  • Coupled waveguide modes in hexagonal photonic crystals 
    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 ...
  • Dispersionless tunneling of slow light in antisymmetric photonic crystal couplers 
    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 ...
  • Efficient couplers for photonic crystal waveguides 
    Dossou Kokou; Botten Lindsay; De Sterke C; Mcphedran Ross; Asatryan Ara; Chen Swee; Brnovic Jovana (Elsevier Science, 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 ...
  • Efficient couplers for photonic crystal waveguides 
    Mcphedran Ross; Dossou Kokou; Botten Lindsay; Asatryan Ara; De Sterke C; Chen Shigang; Brnovic Jovana (Optical Society of America, 2005)
    We consider the design of efficient couplers between a photonic crystal waveguide and a uniform background material. We show that horn-shaped tapers can provide efficient bi-directional coupling between the waveguide and ...
  • Efficient coupling into slow light photonic crystal waveguide without transition region: role of evanescent modes 
    Mcphedran Ross; Botten Lindsay; De Sterke C; White Thomas; Dossou Kokou (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 ...
  • Efficient slow-light coupling in a photonic crystal waveguide without transition region 
    Mcphedran Ross; Dossou Kokou; White Thomas; De Sterke C; Botten Lindsay (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 ...
  • Efficient Slow Light Coupling Into Photonic Crystals 
    De Sterke C; Walker Jacqueline; Dossou Kokou; Botten Lindsay (Optical Society of America, 2007)
  • Engineering cavity modes in photonic crystal double-heterostructures 
    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 ...
  • Exact modelling of generalised defect modes in photonic crystal structures 
    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 ...
  • Exact modelling of generalised defect modes in photonic crystal structures 
    Botten Lindsay; Dossou Kokou; 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 ...
  • Finite element computation of grating scattering matrices and application to photonic crystal band calculations 
    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 ...
  • First-principles method for high-Q photonic crystal cavity mode calculations 
    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 ...
  • A flexible Bloch mode method for computing complex band structures and impedances of two-dimensional photonic crystals 
    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 ...
  • Form Birefringence In UVexposed Photosensitive Fibers Computed Using A Higher Order Finite Element Method 
    Belhadj N; Larochelle Sophie; Dossou Kokou (Optical Society of America, 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 ...
  • Gap-edge asymptotics of defect modes in two-dimensional photonic crystals 
    Dossou Kokou; Mcphedran Ross; Botten Lindsay; Asatryan Ara; De Sterke C (Optical Society of America, 2007)
    We consider defect modes created in complete gaps of 2D photonic crystals by perturbing the dielectric constant in some region. We study their evolution from a band edge with increasing perturbation using an asymptotic ...
  • Gap-edge asymptotics of defect modes in twodimensional photonic crystals 
    Dossou Kokou; Mcphedran Ross; Botten Lindsay; Asatryan Ara; De Sterke C (Optical Society of America, 2007)
    We consider defect modes created in complete gaps of 2D photonic crystals by perturbing the dielectric constant in some region. We study their evolution from a band edge with increasing perturbation using an asymptotic ...
  • Highly accurate modelling of generalised defect modes in photonic crystals using the fictitious source superposition method 
    Dossou Kokou; Botten Lindsay; Wilcox Stuart; Mcphedran Ross; De Sterke C; Nicorovici Nicolae; Asatryan Ara (International Journal of microwave and optical Technology, 2006)
    We present an exact theory for modelling the modes of two-dimensional photonic crystals with a truly infinite cladding. It builds on our previous implementation of the fictitious source superposition method for simple ...