Browsing General by Author "Botten Lindsay"

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Browsing General by Author "Botten Lindsay"

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  • 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 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 ...
  • Evidence Of A Mobility Edge For Photons In Two Dimensions 
    Asatryan Ara; Botten Lindsay; Byrne Michael; Mcphedran Ross; De Sterke C (American Physical Society, 2007)
    We demonstrate for the first time a nonlinear finite-difference time-domain (FDTD) analysis of optical parametric four-wave mixing (FWM) in an actual InGaAsP–InP-based racetrack microresonator, and the results are ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Local observation of modes from three-dimensional woodpile photonic crystals with near-field microspectroscopy under supercontinuum illumination 
    Jia Baohua; Norton Andrew; Li Jiafang; Rahmani Adel; Asatryan Ara; Botten Lindsay; Gu Min (Optical Society of America, 2008)
    A near-field microscope coupled with a near-infrared (NIR) supercontinuum source is developed and applied to characterize optical modes in a three-dimensional (3D) woodpile photonic crystal (PC) possessing a NIR partial ...
  • Modal method for classical diffraction by slanted lamellar gratings 
    Campbell Samuel; Botten Lindsay; Mcphedran Ross; De Sterke C (Optical Soc Amer, 2008)
    We consider lamellar gratings made of dielectric or lossy materials used in classical diffraction mounts. We show how the modal diffraction formulation may be generalized to deal with slanted lamellar gratings and illustrate ...
  • Modes of symmetric composite defects in two-dimensional photonic crystals 
    Mcphedran Ross; Mahmoodian Sahand; Dossou Kokou; Botten Lindsay; Poulton Christopher; De Sterke C (American Physical Society, 2009)
    We consider the modal fields and resonance frequencies of composite defects in two-dimensional photonic crystals (PCs). Using an asymptotic method based on Green's functions, we show that the coupling matrices for the ...
  • Shallow defect states in two-dimensional photonic crystals 
    Asatryan Ara; Poulton Christopher; Dossou Kokou; Mcphedran Ross; Botten Lindsay; De Sterke C (American Physical Society, 2008)
    We investigate localized defect states near the edge of a band gap in a two-dimensional photonic crystal. An asymptotic approach based on Green's functions leads to analytical results both for the frequency and for the ...