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Träfflista för sökning "L773:1094 4087 ;pers:(Tassin Philippe 1982)"

Sökning: L773:1094 4087 > Tassin Philippe 1982

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1.
  • Dalarsson, Mariana, et al. (författare)
  • Analytical solution for wave propagation through a graded index interface between a right-handed and a left-handed material
  • 2009
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 17:8, s. 6747-6752
  • Tidskriftsartikel (refereegranskat)abstract
    • We have investigated the transmission and reflection properties of structures incorporating left-handed materials with graded index of refraction. We present an exact analytical solution to Helmholtz' equation for a graded index profile changing according to a hyperbolic tangent function along the propagation direction. We derive expressions for the field intensity along the graded index structure, and we show excellent agreement between the analytical solution and the corresponding results obtained by accurate numerical simulations. Our model straightforwardly allows for arbitrary spectral dispersion.
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2.
  • Ginis, Vincent, et al. (författare)
  • Frequency converter implementing an optical analogue of the cosmological redshift
  • 2010
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 18:5, s. 5350-5355
  • Tidskriftsartikel (refereegranskat)abstract
    • According to general relativity, the frequency of electromagnetic radiation is altered by the expansion of the universe. This effect-commonly referred to as the cosmological redshift-is of utmost importance for observations in cosmology. Here we show that this redshift can be reproduced on a much smaller scale using an optical analogue inside a dielectric metamaterial with time-dependent material parameters. To this aim, we apply the framework of transformation optics to the Robertson-Walker metric. We demonstrate theoretically how perfect redshifting or blueshifting of an electromagnetic wave can be achieved without the creation of sidebands with a device of finite length.
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3.
  • Kini Manjeshwar, Sushanth, 1990, et al. (författare)
  • Integrated microcavity optomechanics with a suspended photonic crystal mirror above a distributed Bragg reflector
  • 2023
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 31:19, s. 30212-30226
  • Tidskriftsartikel (refereegranskat)abstract
    • Increasing the interaction between light and mechanical resonators is an ongoing endeavor in the field of cavity optomechanics. Optical microcavities allow for boosting the interaction strength through their strong spatial confinement of the optical field. In this work, we follow this approach by realizing a sub-wavelength-long, free-space optomechanical microcavity on-chip fabricated from an (Al,Ga)As heterostructure. A suspended GaAs photonic crystal mirror is acting as a highly reflective mechanical resonator, which together with a distributed Bragg (DBR) reflector forms an optomechanical microcavity. We demonstrate precise control over the microcavity resonance by change of the photonic crystal parameters. We find that the microcavity mode can strongly couple to the transmissive modes of the DBR. The interplay between the microcavity mode and a guided resonance of the photonic crystal modifies the cavity response and results in a stronger dynamical backaction on the mechanical resonator compared to conventional optomechanical dynamics.
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4.
  • Martinez Llinas, Jade, 1985, et al. (författare)
  • A Gaussian reflective metasurface for advanced wavefront manipulation
  • 2019
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 27:15, s. 21069-21082
  • Tidskriftsartikel (refereegranskat)abstract
    • Metasurfaces enable us to control the fundamental properties of light with unprecedented flexibility. However, most metasurfaces realized to date aim at modifying plane waves. While the manipulation of nonplanar wavefronts is encountered in a diverse number of applications, their control using metasurfaces is still in its infancy. Here we design a metareflector able to reflect a diverging Gaussian beam back onto itself with efficiency over 90% and focusing at an arbitrary distance. We outline a clear route towards the design of complex metareflectors that can find applications as diverse as optical tweezing, lasing, and quantum optics.
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5.
  • Tassin, Philippe, 1982, et al. (författare)
  • Pattern formation without diffraction matching in optical parametric oscillators with a metamaterial
  • 2009
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 17:11, s. 9428-9433
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider a degenerate optical parametric oscillator containing a left-handed material. We show that the inclusion of a left-handed material layer allows for controlling the strength and sign of the diffraction coefficient at either the pump or the signal frequency. Subsequently, we demonstrate the existence of stable dissipative structures without diffraction matching, i.e., without the usual relationship between the diffraction coefficients of the signal and pump fields. Finally, we investigate the size scaling of these light structures with decreasing diffraction strength.
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6.
  • Tassin, Philippe, 1982, et al. (författare)
  • Planar designs for electromagnetically induced transparency in metamaterials
  • 2009
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 17:7, s. 5595-5605
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a planar design of a metamaterial exhibiting electromagnetically induced transparency that is amenable to experimental verification in the microwave frequency band. The design is based on the coupling of a split-ring resonator with a cut-wire in the same plane. We investigate the sensitivity of the parameters of the transmission window on the coupling strength and on the circuit elements of the individual resonators, and we interpret the results in terms of two linearly coupled Lorentzian resonators. Our metamaterial designs combine low losses with the extremely small group velocity associated with the resonant response in the transmission window, rendering them suitable for slow light applications at room temperature.
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7.
  • Tassin, Philippe, 1982, et al. (författare)
  • Three-dimensional structures in nonlinear cavities containing left-handed materials
  • 2006
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 14:20, s. 9338-9343
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the coupling between negative diffraction and direct dispersion in a nonlinear ring cavity containing slabs of Kerr nonlinear right-handed and left-handed materials. Within the mean field approximation, we show that a portion of the homogeneous response curve is affected by a three-dimensional modulational instability. We show numerically that the light distribution evolves through a sequence of three-dimensional dissipative structures with different lattice symmetry. These structures are unstable with respect to the upswitching process, leading to a premature transition to the upper branch in the homogeneous hysteresis cycle.
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8.
  • Zhang, P., et al. (författare)
  • Numerical investigation of the flat band Bloch modes in a 2D photonic crystal with Dirac cones
  • 2015
  • Ingår i: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 23:8, s. 10444-10452
  • Tidskriftsartikel (refereegranskat)abstract
    • A numerical method combining complex-k band calculations and absorbing boundary conditions for Bloch waves is presented. We use this method to study photonic crystals with Dirac cones. We demonstrate that the photonic crystal behaves as a zero-index medium when excited at normal incidence, but that the zero-index behavior is lost at oblique incidence due to excitation of modes on the flat band. We also investigate the formation of monomodal and multimodal cavity resonances inside the photonic crystals, and the physical origins of their different line-shape features.
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9.
  • Zhao, Rongkuo, et al. (författare)
  • Optical forces in nanowire pairs and metamaterials
  • 2010
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 18:25, s. 25665-25676
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the optical force arising when isolated gold nanowire pairs and metamaterials with a gold nanowire pair in the unit cell are illuminated with laser radiation. Firstly, we show that isolated nanowire pairs are subject to much stronger optical forces than nanospheres due to their stronger electric and magnetic dipole resonances. We also investigate the properties of the optical force as a function of the length of the nanowires and of the distance between the nanowires. Secondly, we study the optical force in a metamaterial that consists of a periodic array of nanowire pairs. We show that the ratio of the size of the unit cell to the length of the nanowires determines whether the electric dipole resonance leads to an attractive or a repulsive force, and we present the underlying physical mechanism for this effect.
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10.
  • Zou, Yanhong, et al. (författare)
  • Interaction between graphene and metamaterials: Split rings vs. wire pairs
  • 2012
  • Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 20:11, s. 12198-12204
  • Tidskriftsartikel (refereegranskat)abstract
    • We have recently shown that graphene is unsuitable to replace metals in the current-carrying elements of metamaterials. At the other hand, experiments have demonstrated that a layer of graphene can modify the optical response of a metal-based metamaterial. Here we study this electromagnetic interaction between metamaterials and graphene. We show that the weak optical response of graphene can be modified dramatically by coupling to the strong resonant fields in metallic structures. A crucial element determining the interaction strength is the orientation of the resonant fields. If the resonant electric field is predominantly parallel to the graphene sheet (e.g., in a complementary split-ring metamaterial), the metamaterial's resonance can be strongly damped. If the resonant field is predominantly perpendicular to the graphene sheet (e.g., in a wire-pair metamaterial), no significant interaction exists.
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