Browsing by Author "Rahmani Adel"

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Browsing by Author "Rahmani Adel"

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  • Active Near-Field Optical Microscopy 
    Le Gac Gaelle; Rahmani Adel; Seassal Christian; Picard Emmanuel; Hadji Emmanuel; Callard Segolene (IEEE, 2008)
    Near-field probe was used to tune the resonance wavelength of a linear cavity. Theoritical and experimental study are presented to show the effect of the probe material on the cavity resonance
  • Blazing evanescent grating orders: a spectral approach to beating the Rayleigh limit 
    Handmer Casey; De Sterke C; Mcphedran Ross; Botten Lindsay; Steel Michael; Rahmani Adel (Optical Society of America, 2010)
    We develop a way to enhance the amplitudes of the nonpropagating evanescent orders of resonant dielectric gratings. We use this blazing to design gratings with spectra tailored to generate steerable sub-Rayleigh field ...
  • Comparison of the sensitivity of air and dielectric modes in photonic crystal slab sensors 
    Tomljenovic-Hanic Snjezana; Rahmani Adel; Steel Michael; De Sterke Martijn (Optical Society of America, 2009)
    Optical cavities provide a route to sensing through the shift of the optical resonant peak. However, effective sensing with optical cavities requires the optimization of the modal quality factor, Q, and the field overlap ...
  • Confinement of BandEdge Modes in a Photonic Crystal Slab 
    Bordas Frederic; Steel Michael; Seassal Christian; Rahmani Adel (Optical Society of America, 2007)
    We study the confinement of low group velocity band-edge modes in a photonic crystal slab. We use a rigorous, three dimensional, finite-difference time-domain method to compute the electromagnetic properties of the modes ...
  • Coupled-dipole method for magnetic and negative refraction materials 
    Chaumet Patrick; Rahmani Adel (Elsevier, 2009)
    We present a derivation of the coupled-dipole method, also called discrete dipole approximation, for scatterers with arbitrary dielectric permittivity and magnetic permeability. We discuss the numerical implementation of ...
  • Coupled dipole method for radiation dynamics in finite photonic crystal structures 
    Bordas Frederic; Louvion Nicolas; Callard Segolene; Chaumet Patrick; Rahmani Adel (American Physical Society, 2006)
    We present a coupled-dipole treatment of radiation dynamics in the weak-coupling regime in a finite threedimensional photonic crystal structure. The structure is discretized in real space and the self-consistent local field ...
  • Coupled dipole method for scatterers with large permittivity 
    Chaumet Patrick; Sentenac Anne; Rahmani Adel (American Physical Society, 2004)
    In the coupled dipole method, a three-dimensional scattering object is discretized over a lattice into a set of polarizable units that are coupled self-consistently. Starting from the volume integral equation for the ...
  • Coupled-dipole method in time domain 
    Chaumet Patrick; Belkebir Kamal; Rahmani Adel (Optical Society of America, 2008)
    We present a time-domain formulation of electrodynamics based on the self-consistent derivation of the electromagnetic field in a linear, dispersive, lossy object via the coupled dipole method.
  • Coupled dipole method with an exact longwavelength limit and improved accuracy at finite frequencies 
    Rahmani Adel; Chaumet Patrick; Bryant Garnett (Optical Society of America, 2002)
    We present a new formulation of the coupled dipole method that accounts for local-field effects and is exact in the long-wavelength limit. This formulation also leads to improved accuracy of the description of ...
  • Design And Investigation Of Surface Addressable Photonic Crystal Cavity Confined Band Edge Modes For Quantum Photonic Devices 
    Nedel P; Letartre Xavier; Seassal Christian; Auffeves A; Ferrier L; Drouard E; Rahmani Adel; Viktorovitch Pierre (Optical Soc Amer, 2011)
    We propose to use a localized Ã-point slow Bloch mode in a 2D-Photonic Crystal (PC) membrane to realize an efficient surface emitting source. This device can be used as a quantum photonic device, e.g. a single photon source. ...
  • Direct writing of planar lightwave devices using ultrafast lasers 
    Marshall Graham; Ams Martin; Little Doug; Jovanovic Nemanja; Fuerbach Alex; Dekker Peter; Rahmani Adel; Dawes Judith; Piper Jim; Withford Michael (IEEE, 2007)
    Ultrafast laser direct write micro-fabrication has emerged as a significant enabling technology creating new opportunities in microphotonics. The talk will present recent results of the performance of laser written ...
  • Discrete Dipole Approximation for the Study of Radiation Dynamics in a Magnetodielectric Environment 
    Rahmani Adel; Chaumet Patrick; Bryant Garnett (Optical Society of America, 2010)
    We develop a general computational approach, based on the discrete dipole approximation, for the study of radiation dynamics near or inside an object with arbitrary linear dielectric permittivity, and magnetic permeability ...
  • Discrete dipole approximation for the study of radiation dynamics in a magnetodielectric environment 
    Rahmani Adel; Chaumet Patrick; Bryant Garnett (Optical Society of America, 2010)
    We develop a general computational approach, based on the discrete dipole approximation, for the study of radiation dynamics near Of inside an object with arbitrary linear dielectric pennittivity, and magnetic penneability ...
  • Discrete Dipole Approximation For Time-Domain Computation Of Optical Forces On Magnetodielectric Scatterers 
    Chaumet Patrick; Belkebir Kamal; Rahmani Adel (Optical Soc Amer, 2011)
    We present a general approach, based on the discrete dipole approximation (DDA), for the computation of the exchange of momentum between light and a magnetodielectric, three-dimensional object with arbitrary geometry and ...
  • Efficient computation of optical forces with the coupled dipole method 
    Rahmani Adel; Chaumet Patrick; Sentenac Anne; Bryant Garnett (American Physical Society, 2005)
    We present computational techniques to compute in an efficient way optical forces on arbitrary nanoobjects using the coupled dipole method. We show how the time of computation can be reduced by several orders of magnitude ...
  • Efficient iterative solution of the discrete dipole approximation for magneto-dielectric scatterers 
    Chaumet Patrick; Rahmani Adel (Optical Society of America, 2009)
    The discrete dipole approximation (DDA) has been widely used to study light scattering by nonmagnetic objects. The electric field inside an arbitrary scatterer is found by solving a dense, symmetric, linear system using, ...
  • Electromagnetic Force And Torque On Magnetic And Negative-Index Scatterers 
    Chaumet Patrick; Rahmani Adel (Optical Soc Amer, 2009)
    We derive the analytic expressions of the electromagnetic force and torque on a dipolar particle, with arbitrary dielectric permittivity and magnetic permeability.We then develop a general framework, based on the coupled ...
  • Generalization of the coupled dipole method to periodic structures 
    Chaumet Patrick; Rahmani Adel; Bryant Garnett (American Physical Society, 2003)
    We present a generalization of the coupled dipole method to the scattering of light by arbitrary periodic structures. This formulation of the coupled dipole method relies on the same direct-space discretization scheme that ...
  • Localfield correction for an interstitial impurity in a crystal 
    Rahmani Adel; Chaumet Patrick; Bryant Garnett (Optical Society of America, 2002)
    The local-field correction experienced by an interstitial impurity in a crystal with cubic symmetry is derived by use of a rigorous, self-consistent, semimicroscopic description of spontaneous emission in a microcavity. We ...
  • Localfield enhancement in an optical force metallic nanotrap Application to singlemolecule spectroscopy 
    Chaumet Patrick; Rahmani Adel; Nieto-Vesperinas Manuel (Optical Society of America, 2006)
    We study the local-field enhancement in a nanocavity created by optical nanomanipulation. Recently we showed that a metallic probe can modify the optical force experienced by a metallic particle and generate a material ...