J C Rodier

French National Centre for Scientific Research, Lutetia Parisorum, Île-de-France, France

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Publications (30)46.67 Total impact

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    ABSTRACT: We report statistical fluctuations for the transmissions of a series of photonic-crystal waveguides (PhCWs) that are supposedly identical and that only differ because of statistical structural fabrication-induced imperfections. For practical PhCW lengths offering tolerable -3dB attenuation with moderate group indices (n(g) approximately 60), the transmission spectra contains very narrow peaks (Q approximately 20,000) that vary from one waveguide to another. The physical origin of the peaks is explained by calculating the actual electromagnetic-field pattern inside the waveguide. The peaks that are observed in an intermediate regime between the ballistic and localization transports are responsible for a smearing of the local density of states, for a rapid broadening of the probability density function of the transmission, and bring a severe constraint on the effective use of slow light for on-chip optical information processing. The experimental results are quantitatively supported by theoretical results obtained with a coupled-Bloch-mode approach that takes into account multiple scattering and localization effects.
    Optics Express 07/2010; 18(14):14654-63. · 3.55 Impact Factor
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    ABSTRACT: We describe a Fourier transform (FT) spectrometer designed to operate down to 60 nm (20 eV) on a synchrotron radiation beamline for high resolution absorption spectrometry. As far as we know, such an instrument is not available below 140 nm mainly because manufacturing accurate and efficient beam splitters remains a major problem at these wavelengths, especially if a wide bandwidth operation is desired. In order to overcome this difficulty, we developed an interferometer based on wave front division instead of amplitude division. It relies on a modified Fresnel bimirror configuration that requires only flat mirrors. The instrument provides path difference scanning through the translation of one reflector. During the scanning, the moving reflector is controlled by an optical system that keeps its direction constant within a tolerable value and provides an accurate interferometric measurement of the path difference variation. Therefore, a regular interferogram sampling is obtained, producing a nominal spectral impulse response and an accurate spectral calibration. The first results presented in this paper show a measured spectral resolution of delta(sigma)=0.33 cm-1 (interval between spectral samples). This was obtained with a sampling interval of 29 nm (path difference) and 512 K samples from a one-sided interferogram using a cosine FT. Such a sampling interval should allow the recording of large bandwidth spectra down to lambda=58 nm with an ultimate resolving power of 500,000 at this wavelength. In order to check the instrument performances, we first recorded an interferogram from a He-Ne stabilized laser. This provided the actual spectral impulse function, which was found to be fully satisfactory. The determination of the impulse response distortion and of the noise on the vacuum ultraviolet (VUV) spectral range provided accurate information in the sampling error profile over a typical scan. Finally, the instrument has been moved to the SU5 undulator-based synchrotron radiation beamline (Super-ACO facility, LURE, Orsay, France). A high resolution spectrum of O2 (the Schumann-Runge absorption bands, 185-200 nm) was computed from recorded interferograms using the beamline monochromator at the zeroth order to feed the instrument with an 11% relative bandwidth "white" beam (2003). These UV measurements are very close to those found in the literature, showing nominal performances of the FT spectrometer that should translate into an unprecedented resolving power at shortest VUV wavelengths. A recent upgrade (2007) and future developments will be discussed in light of the current installation of the upgraded FT spectrometer as a permanent endstation for ultrahigh resolution absorption spectrometry on the VUV beamline DESIRS at SOLEIL, the new French third generation synchrotron facility.
    The Review of scientific instruments 05/2009; 80(4):043101. · 1.52 Impact Factor
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    ABSTRACT: A Fourier transform spectrometer dedicated to Vacuum Ultra-Violet [180-40nm] photoabsorption has been developed. The first experimental results, presented here, show unprecedented resolving power, above 700000. The instrument is an endstation on the DESIRS synchrotron beamline.
    04/2009;
  • 01/2009;
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    ABSTRACT: Ultrahigh Q/V lineic silicon Fabry Perot (FP) microcavities relying on silica substrate have been fabricated. Two cavities designs are studied based respectively on cavity mode losses recycling and on mirrors with tapered sections. The experimental evolution of cavities characteristics are studied as a function of sample temperature. The authors achieve a quality factor of 58000 for a modal volume of 0.6 (lambda/n)3.
    Proc SPIE 01/2008;
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    ABSTRACT: We experimentally demonstrate an ultra high Q/V nanocavity on SOI substrate. The design is based on modal adaptation within the cavity and allows to measure a quality factor of 58.000 for a modal volume of 0.6(lambda/n)(3) . This record Q/V value of 10(5) achieved for a structure standing on a physical substrate, rather than on membrane, is in very good agreement with theoretical predictions also shown. Based on these experimental results, we show that further refinements of the cavity design could lead to Q/V ratios close to 10(6).
    Optics Express 12/2007; 15(24):16090-6. · 3.55 Impact Factor
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    ABSTRACT: A VUV Fourier transform spectrometer based on a wavefront division interferometer has been built. Our ultimate goal is to provide a high resolution absorption spectrometer in the 140 – 40 nm range using the new third generation French synchrotron source Soleil as the background continuum. Here, we present the design and latest performance of the instrument scanning control system. It is based on multiple reflections of a monomode, frequency‐stabilized HeNe laser between two plane mirrors allowing the required sensitivity on the displacement of the interferometer mobile arm. The experimental results on the sampling precision show an rms error below 5 nm for a travel length of 7.5 mm. © 2007 American Institute of Physics
    AIP Conference Proceedings. 01/2007; 879(1):447-450.
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    ABSTRACT: Microcavities offering small modal volumes V[approximate]0.6 (lambda/n)3 and consisting of two identical tapered Bragg mirrors etched into a monomode silicon-on-insulator ridge waveguide are studied for operation at telecommunications wavelengths. The authors have measured a Q factor of 8900, for a loaded cavity with a peak transmission at resonance in excess of 60%. The measured Q value quantitatively agrees with the calculation results and is 20 times larger than those previously reported for similar geometries without tapers.
    Applied Physics Letters 10/2006; 89. · 3.52 Impact Factor
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    ABSTRACT: Microcavities consisting of two identical tapered mirrors etched into silicon-on-insulator ridge waveguides are investigated for operation at telecommunication wavelengths. They offer very small modal volumes of approximately 0.6 (λ/n)3 and calculated intrinsic Q factors of 400 000. We have measured a Q factor of 8900 for a loaded cavity, in agreement with the theoretical value. In contrast to recent works performed on suspended membranes, the buried SiO2 layer is not removed. The cavities possess strong mechanical robustness, thus making them attractive from the viewpoint of integration in large systems. The cavity Q factor is much larger than those previously obtained for similar geometries on a substrate.
    New Journal of Physics 09/2006; 8:204. · 4.06 Impact Factor
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    ABSTRACT: A near-field optical probe is used to observe the electromagnetic field within photonic crystal nanocavities. The cavity mirrors are designed to provide mode matching. A quality factor enhancement by two orders of magnitude is observed
    07/2006;
  • P Lalanne, J P Hugonin, J C Rodier
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    ABSTRACT: We present a semianalytical model that quantitatively predicts the scattering of light by a single subwavelength slit in a thick metal screen. In contrast to previous theoretical works related to the transmission properties of the slit, the analysis emphasizes the generation of surface plasmons at the slit apertures. The model relies on a two-stage scattering mechanism, a purely geometric diffraction problem in the immediate vicinity of the slit aperture followed by the launching of a bounded surface-plasmon wave on the flat interfaces surrounding the aperture. By comparison with a full electromagnetic treatment, the model is shown to provide accurate formulas for the plasmonic generation strength coefficients, even for metals with a low conductivity. Limitations are outlined for large slit widths (>lambda) or oblique incidence (>30 degrees ) when the slit is illuminated by a plane wave.
    Journal of the Optical Society of America A 07/2006; 23(7):1608-15. · 1.67 Impact Factor
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    P Lalanne, J P Hugonin, J C Rodier
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    ABSTRACT: In this Letter, we study the scattering of light by a single subwavelength slit in a metal screen. In contrast with previous theoretical works, we provide a microscopic description of the scattering process by emphasizing the generation of surface plasmons at the slit apertures. The analysis is supported by a rigorous formalism based on a normal-mode-decomposition technique and by a semianalytical model that provides accurate formulas for the plasmonic generation strengths. The generation is shown to be fairly efficient for metals with a low conductivity, such as gold in the visible regime. Verification of the theory is also shown by comparison with recent experimental data [H. F. Schouten, Phys. Rev. Lett. 94, 053901 (2005)].
    Physical Review Letters 01/2006; 95(26):263902. · 7.73 Impact Factor
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    ABSTRACT: Short microcavities consisting of two identical tapered hole mirrors etched into silicon-on-insulator ridge waveguides are investigated. They are designed for operating at telecom wavelength. We describe theoretically and experimentally two different ways to boost quality factors to some thousands. In one hand, we investigate the adaptation of mode profile to suppress mismatch losses. In an other hand, we explore the recycling of the losses. We obtained quality factor up to 3000, which opens the route to WDM applications.
    Proc SPIE 01/2006;
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    P Lalanne, J C Rodier, J P Hugonin
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    ABSTRACT: Recent works dealt with the optical transmission on arrays of subwavelength holes perforated in a thick metallic film. We have performed simulations which quantitatively agree with experimental results and which unambiguously evidence that the extraordinary transmission is due to the excitation of a surface-plasmon-polariton (SPP) mode on the metallic film interfaces. We identify this SPP mode and show that its near-field possesses a hybrid character, gathering collective and localised effects which are both essential for the transmission.
    Journal of Optics A Pure and Applied Optics 07/2005; · 1.92 Impact Factor
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    ABSTRACT: La spectrométrie par transformation de Fourier est une technique maintenant bien maitrisée, qui permet d'obtenir des spectres à la fois exacts et à très haute résolution, de l'infra-rouge lointain à l'ultra-violet, jusque vers 140-120 nm. En dessous, en particulier de 140 à 20 nm environ, la technique est complètement absente, essentiellement en raison de la quasi impossibilité de fabriquer des lames séparatrices ayant les qualités requises. Or, dans ce domaine, la physique atomique et moléculaire est demandeuse d'une précision et d'une résolution que n'apportent que partiellement les spectromètres à réseaux utilisés. Nous présentons les principes et la réalisation d'un interféromètre à balayage dédié à la spectrométrie TF jusque lambda =58 nm, avec une résolution au moins égale à 400 000 à 80 nm. Le problème de la séparatrice est résolu radicalement par l'utilisation d'un interféromètre à division de front d'onde. La précision du balayage en différence de marche est obtenue grâce à un système original de contrôle et de mesure du déplacement du réflecteur mobile. Nous présentons les premières mesures réalisées dans l'air, vers 200 nm (bande d'absorption de O{2}, source synchrotron), avec les paramètres de balayage du système nominal (500 000 échantillons espacés de 30 nm env., TF en cosinus).
    Journal de Physique IV (Proceedings) 01/2005; 127:77-85. · 0.29 Impact Factor
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    ABSTRACT: An accurate three-dimensional method to calculate the Bloch modes of photonic crystal (PhC) waveguides is proposed. Good agreement with available experimental and numerical data is obtained. The originality of the method lies in the fact that the Bloch modes are seen as the electromagnetic fields associated to the complex poles of an in-plane transversal scattering matrix. In comparison with previous approaches, the computational domain discretized is smaller and a higher accuracy for the losses of PhC waveguides is achieved.
    IEEE Photonics Technology Letters 10/2003; · 2.04 Impact Factor
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    ABSTRACT: We present experimental results obtained for blazed-binary gratings with periods between 1.6λ and 114.7λ blazed at λ = 633 nm. These gratings are composed of subwavelength pillars with pulse-width modulation within the periods. For small periods up to 3λ, the measured efficiencies agree well with the theoretical predictions. But for large periods, the discrepancy between the theoretical and experimental efficiencies is significant, reaching almost 20% for the grating with the largest period. In order to identify the origin of this discrepancy, a Mach–Zehnder interferometer dedicated to the characterization of small-size gratings (≈400 × 400 µm2) is set up. The interferometric characterization combined with scanning-electron-microscope observations reveal that the 20% discrepancy is due to a deficiency of the fabrication process for the smallest pillars and to an overall fabrication of pillars with actual widths smaller than their nominal values. These two fabrication errors can reasonably be expected to be eliminated in future work.
    Journal of Optics A Pure and Applied Optics 08/2003; 5(5):S244. · 1.92 Impact Factor
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    ABSTRACT: A perturbative approach for surface-plasmon-related effects encountered in metallo dielectric interfaces that incorporate periodic subwavelength defects with arbitrary shapes or materials is presented. It provides a simple insight into the physics of some important optical properties of these interfaces. We apply this understanding to one and two-dimensional metallic membranes perforated by subwavelength apertures and other related gratings geometries. The approach accounts quantitatively for the nearly null transmission of these membranes in the surface plasmon frequency band. It also predicts phenomena like an antisymmetric surface plasmon resonance for gratings with a vertical mirror symmetry at very small incidences and the possible absence of any reflection when outcoupling from an array of subwavelength slits into free space.
    Physical Review B 01/2003; 68(12). · 3.66 Impact Factor
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    ABSTRACT: Developments in microlithography and associated technologies now make it possible to produce "artificial media" by engineering the Bloch mode of optical periodic structures. Applications of this concept to imaging diffractive optical elements lead to new components with unprecedented performance.
    01/2003;
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    ABSTRACT: Blazed diffractive elements are currently fabricated with continuous profiles or with staircase approximations. Blazed-binary gratings are more recent diffractive elements which implement continuous phase delays through a gradient-index artificial material with subwavelength binary etches. The performance of these diffractive elements in the resonance domain opens up new perspectives for manufacturing fast lenses. The objective of this paper is to review the main and unique properties of blazed-binary diffractive elements and to consider the consequences for monochromatic imaging systems.
    Journal of Optics A Pure and Applied Optics 08/2002; 4(5):S119. · 1.92 Impact Factor

Publication Stats

526 Citations
46.67 Total Impact Points

Institutions

  • 1996–2006
    • French National Centre for Scientific Research
      • Laboratory for Photonics and Nanostructures - LPN
      Lutetia Parisorum, Île-de-France, France
    • Pierre and Marie Curie University - Paris 6
      Lutetia Parisorum, Île-de-France, France
    • Université Paris-Sud 11
      • Institut d'Electronique Fondamentale
      Orsay, Île-de-France, France