Browsing General by Author "Asatryan, Ara"

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Browsing General by Author "Asatryan, Ara"

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  • Asatryan, Ara; Gredeskul, Sa; Botten, Lindsay; Byrne, Michael; Freilikher, Valentin; Shadrivov, Iv; Mcphedran, Ross; Kivshar, Y (Amer Physical Soc, 2010)
    We study the propagation and localization of classical waves in one-dimensional disordered structures composed of alternating layers of left-and right-handed materials (mixed stacks) and compare them with structures composed ...
  • Asatryan, Ara; Botten, Lindsay; Byrne, Michael; Nicorovici, Nicolae; Mcphedran, Ross; De Sterke, C; Robinson, Peter; Langtry, Tim (American Physical Soc, 2005)
    The conductance of photons in two-dimensional disordered photonic crystals is calculated using an exact multipole-plane wave method that includes all multiple scattering processes. Conductance fluctuations, the universal ...
  • Asatryan, Ara; Robinson, Peter; Mcphedran, Ross; Botten, Lindsay; De Sterke, C; Nicorovici, Nicolae; Langtry, Tim (American Physical Soc, 2003)
  • Asatryan, Ara; Botten, Lindsay; De Sterke, C; Mcphedran, Ross; Robinson, Peter; Langtry, Tim (American Physical Soc, 2003)
  • 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 ...
  • 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 ...
  • Asatryan, Ara; Botten, Lindsay; Nicorovici, Nicolae; Mcphedran, Ross; De Sterke, C (Taylor & Francis Ltd, 2006)
    The frequency (Lamb) shift and local density of states (LDOS) in two-dimensional photonic crystals composed of a cluster of infinitely long circular cylinders is calculated classically using the radiation reaction mechanism. ...
  • Dossou, Kokou; Mcphedran, Ross; Botten, Lindsay; Asatryan, Ara; De Sterke, C (Optical Soc Amer, 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 ...
  • 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 ...
  • Kan, Dougal; Asatryan, Ara; Poulton, Christopher; Dossou, Kokou; Botten, Lindsay (Optical Society of America, 2011)
    We extend the fictitious source superposition method in order to model linear defects in photonic woodpiles, and we use the method to model a waveguide that is created by changing either the radius or refractive index of ...
  • De Sterke, C; Botten, Lindsay; Asatryan, Ara; White, Tom; Mcphedran, Ross (Optical Society of America, 2004)
    We consider the modes of coupled photonic crystal waveguides. We find that the fundamental modes ofthese structures can be either even or odd, in contrast with the behaviour in coupled conventional waveguides in which the ...
  • Andreasen, J; Asatryan, Ara; Botten, Lindsay; Byrne, M; Cao, H; Ge, L; Labonte, L; Sebbah, P; Stone, A; T??Reci, H; Vanneste, C (Optical Society of America, 2011)
    In conventional lasers, the optical cavity that confines the photons also determines essential characteristics of the lasing modes such as wavelength, emission pattern, directivity, and polarization. In random lasers, which ...
  • Kan, Dougal; Asatryan, Ara; Poulton, Christopher; Botten, Lindsay (Optical Society of America, 2010)
    We extend the multipole method to allow for rod-type defects in woodpiles composed of infinitely long cylinders. A coupled-resonator optical waveguide and a linear waveguide are considered, where each waveguide is embedded ...
  • Botten, Lindsay; White, Tom; De Sterke, C; Mcphedran, Ross; Asatryan, Ara; Langtry, Tim (Optical Society o America, 2004)
    A rigorous semi-analytic approach to the modelling of coupling guiding and propagation in complex microstructures embedded in two-dimensional photonic crystals is presented. The method, which is based on Bloch mode expansions ...
  • Botten, Lindsay; Asatryan, Ara; White, Tom; De Sterke, C; Mcphedran, Ross; Langtry, Tim (Optical Soc Amer, 2003)
    e present a semianalytic theory for the properties of two-dimensional photonic crystal waveguides of finite length. For single-mode guides, the transmission spectrum and field intensity can be accurately described by a ...
  • Dossou, Kokou; Botten, Lindsay; Mcphedran, Ross; Poulton, Christopher; Asatryan, Ara; 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 ...
  • Asatryan, Ara; Botten, Lindsay; Byrne, Maria; Freilikher, Valentin; Gredeskul, Sa; Shadrivov, Iv; Mcphedran, Ross (Amer Physical Soc, 2007)
    We study wave propagation in mixed, 1D disordered stacks of alternating right- and left-handed layers and reveal that the introduction of metamaterials substantially suppresses Anderson localization. At long wavelengths, ...
  • Asatryan, Ara; Botten, Lindsay; Nicorovici, Nicolae; Mcphedran, Ross; De Sterke, C (Elsevier Science Bv, 2007)
    The frequency shift of sources embedded in a two-dimensional photonic cluster composed of circular cylinders is considered and the effects of cluster shape and orientation are investigated. It is found that by carefully ...
  • Marshall, Glenn; Kan, Dougal; Asatryan, Ara; Botten, Lindsay; Withford, Michael (Optical Soc Amer, 2007)
    The effect of the microstructure on transversely coupled laser light into the core of a photonic crystal fiber is investigated. Computational two-dimensional modeling and direct experimental measurements indicate that there ...
  • Asatryan, Ara; Fabre, Sebastien; Busch, Kurt; Mcphedran, Ross; Botten, Lindsay; De Sterke, C; Nicorovici, Nicolae (Optical Society of America, 2001)