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Phononic band-gap materials and phononic crystals, acousto-optical interactions

• D. Gérard, V. Laude, B. Guizal, S. Benattou, A. Khelif, D. Van Labeke, ``Modulation of the extraordinary optical transmission by surface acoustic waves,'' Phys. Rev. B 76, 235427 (2007).
• J.-C. Beugnot, D. Alasia, H. Maillotte, T. Sylvestre, V. Laude, A. Monteville, L. Provino, N. Traynor, S. F. Mafang, and L. Thévenaz, ``Complete experimental characterization of stimulated Brillouin scattering in photonic crystal fiber, '' Optics Express 15 (23), 15517-15522 (2007).
• F.-L. Hsiao, A. Khelif, H. Moubchir, A. Choujaa, C.-C. Chen, and V. Laude, "Waveguiding in a complete band gap phononic crystal slab," Phys. Rev. E 76 (5), 056601 (2007).
• K. Kokkonen, M. Kaivola, S. Benchabane, A. Khelif, and V. Laude, ``Scattering of surface acoustic waves by a phononic crystal revealed by heterodyne interferometry,'' Appl. Phys. Lett. 91, 083517 (2007). Selected by the Virtual Journal of Nanoscale Science & Technology 16 (11) (2007).
• M. Wilm, A. Khelif, V. Laude, and S. Ballandras, "Design guidelines of 1-3 piezoelectric composites dedicated to ultrasound imaging transducers, based on frequency band-gap considerations," J. Acoust. Soc. Am. 122 (2), 786-793 (2007).
• F.-L. Hsiao, A. Khelif, H. Moubchir, A. Choujaa, C.-C. Chen, and V. Laude, "Complete band gaps and deaf bands of triangular and honeycomb water-steel phononic crystals," J. Appl. Phys. 101, 044903 (2007).
• J.-C. Beugnot, Th. Sylvestre, H. Maillotte, G. Mélin, and V. Laude, "Strong guided acoustic wave Brillouin scattering in photonic crystal fibres," Opt. Lett. 32 (1), 17 (2007).
• A. Khelif, B. Aoubiza, S. Mohammadi, A. Adibi, and V. Laude, "Complete band gaps in two-dimensional phononic crystal slabs," Phys. Rev. E 74, 046610 (2006).
• S. Benchabane, A. Khelif, J.-Y. Rauch, L. Robert, and V. Laude, "Evidence for complete surface wave band gaps in a piezoelectric phononic crystal," Phys. Rev. E 73 065601(R) (2006).
• P. Dainese, N. Joly, J.C. Knight, P.St.J. Russell, G. Wiederhecker, H. Fragnito, V. Laude, and A. Khelif, "Interaction of laser light and microwave sound in photonic crystal fibers with sub-wavelength-scale cores," Nature Physics 2 (6), 388-392 (2006).
• P. Dainese, P. St.J. Russell, G. S. Wiederhecker, N. Joly, H. L. Fragnito, V. Laude, and A. Khelif, "Raman-like light scattering from acoustic phonons in photonic crystal fiber," Optics Express 14 (9), 4141-4150 (2006).
• Y. Pennec, B. Djafari-Rouhani, J.O. Vasseur, H. Larabi, A. Khelif, A. Choujaa, S. Benchabane, and V. Laude, ``Acoustic channel drop tunneling in a phononic crystal,'' Appl. Phys. Lett. 87, 261912 (2005).
• S. Benchabane, A. Khelif, A. Choujaa, B. Djafari-Rouhani, and V. Laude, "Interaction of waveguide and localized modes in a phononic crystal," Europhys. Lett. 71 (4), 570-575 (2005).
• V. Laude, M. Wilm, S. Benchabane, and A. Khelif, "Full band gap for surface acoustic waves in a piezoelectric phononic crystal," Phys. Rev. E 71, 036607 (2005).
• V. Laude, A. Khelif, S. Benchabane, M. Wilm, Th. Sylvestre, B. Kibler, A. Mussot, J. M. Dudley, and H. Maillotte, "Phononic bandgap guidance of acoustic modes in photonic crystal fibers," Phys. Rev. B 71, 045107 (2005). Selected by the Virtual Journal of Nanoscale Science & Technology 11 (3) (2005).
• A. Khelif, M. Wilm, V. Laude, and S. Ballandras, "Guided elastic waves along a rod-defect of a two-dimensional phononic crystal," Phys. Rev. E 69, 067601 (2004).
• A. Khelif, A. Choujaa, S. Benchabane, B. Djafari-Rouhani, and V. Laude, "Guiding and bending of acoustic waves in highly confined phononic crystal waveguides," Appl. Phys. Lett. 84 (22), 4400-4002 (2004).
  © 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Applied Physics Letters and may be found at A. Khelif and al., Appl. Phys. Lett. 84, 4400 (2004).
• A. Khelif, A. Choujaa, B. Djafari-Rouhani, M. Wilm, S. Ballandras, and V. Laude, ``Trapping and guiding of acoustic waves by defect modes in a full-band-gap ultrasonic crystal,'' Phys. Rev. B 68, 214301 (2003).
• A. Khelif, B. Djafari-Rouhani, V. Laude, and M. Solal, ``Coupling characteristics of localized phonons in photonic crystal fibers,'' J. Appl. Phys. 94 (12), 7944-7946 (2003).
  © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in the Journal of Applied Physics and may be found at A. Khelif and al., J. Appl. Phys. 94, 7944 (2003).
• M. Wilm, K. Khelif, S. Ballandras, V. Laude, and B. Djafari-Rouhani, "Out-of-plane propagation of elastic waves in two-dimensional phononic band-gap materials," Phys. Rev. E 67, 065602(R) (2003).

Surface Acoustic waves and ultrasonics

• S. Ballandras, Th. Pastureaud, W. Steichen, W. Daniau, and V. Laude, "High frequency surface acoustic waves excited on thin oriented LiNbO₃ single crystal layers transferred onto silicon," IEEE Trans. Ultrason. Ferroelec. Freq. Control. 84 (4), 870-876 (2007).
• V. Laude, L. Robert, W. Daniau, A. Khelif, and S. Ballandras, "Surface acoustic wave trapping in a periodic array of mechanical resonators," Appl. Phys. Lett. 89 (8), 083515 (2006).
• S. Ballandras, A. Reinhardt, A. Khelif, M. Wilm, V. Laude, W. Daniau, V. Blondeau-Patissier, ``Theoretical analysis of damping effects of guided elastic waves at solid/fluid interfaces,'' J. Appl. Phys. 99, 054907 (2006).
• V. Laude, C. F. Jerez Hanckes, and S. Ballandras, ``Surface Green's function of a piezoelectric halfspace,'' IEEE Trans. Ultrason. Ferroelec. Freq. Control 53 (2), 420-428 (2006).
• V. Laude, A. Reinhardt, and A. Khelif, ``Equality of the energy and group velocities of bulk acoustic waves in piezoelectric media,'' IEEE Trans. Ultrason. Ferroelec. Freq. Control 52 (10), 1869-1871 (2005).
• S. Ballandras, M. Wilm, W. Daniau, A. Reinhardt, V. Laude, ,and R. Armati, "Periodic finite element/boundary element modeling of capacitive micromachined ultrasonic transducers," J. Appl. Phys. 97 (3), 034901 (2005).
• V. Laude, M. Masson, S. Ballandras, and M. Solal, ``Imaginary branches of surface acoustic wave slowness curves,'' J. Appl. Phys. 96 (11), 6895-6902 (2004).
• S. Ballandras, T. Pastureaud, A. Reinhart, V. Laude, A. Soufyane, S. Camou, W. Steichen, W. Daniau, R. Lardat, M. Solal, and P. Ventura, "Simulations of SAW devices built on stratified media using a mixed finite element/boundary integral formulation," J. Appl. Phys. 96 (12), 7731-7741 (2004).
• V. Laude, A. Reinhardt, M. Wilm, A. Khelif, and S. Ballandras, ``Fast FEM/BEM Simulation of SAW Devices Via Asymptotic Waveform Evaluation,'' IEEE Trans. Ultrason. Ferroelec. Freq. Control 51 (3), 359-363 (2004).
• M. Solal, V. Laude, and S. Ballandras, ``A P-matrix based model for SAW grating waveguides taking into account modes conversion at the reflection,'' IEEE Trans. Ultrason. Ferroelec. Freq. Control 51 (12), 1690-1696 (2004).
• A. Reinhardt, Th. Pastureaud, V. Laude, and S. Ballandras, "Scattering matrix method for acoustic waves in piezoelectric, fluid, and metallic multilayers," J. Appl. Phys. 94 (10), 6923-6931 (2003).
• (220 ko, pdf) V. Laude and S. Ballandras, "Slowness curves and characteristics of surface acoustic waves propagating obliquely in periodic finite-thickness electrode gratings,'' J. of Appl. Phys. 94, 1235-1242 (2003).
  © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in the Journal of Applied Physics and may be found at V. Laude and al., J. Appl. Phys. 94, 1235 (2003).
• (68 ko, pdf) V. Laude, M. Wilm, and S. Ballandras, "A least-action principle for the estimation of the slowness and the attenuation of pseudo surface acoustic waves,'' J. of Appl. Phys. 93, 10084-10088 (2003).
  © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in the Journal of Applied Physics and may be found at V. Laude and al., J. Appl. Phys. 93, 10084 (2003).
• (363 ko, pdf) S. Ballandras, M.Wilm, P.F. Edoa, A. Soufyane, V. Laude, W. Steichen, and R. Lardat, "Finite element analysis of periodic piezoelectric transducers,'' J. of Appl. Phys. 93, 702-711 (2003).
  © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in the Journal of Applied Physics and may be found at S. Ballandras and al., J. Appl. Phys. 93, 702 (2003).
• (47 ko, pdf) Th. Pastureaud, V. Laude, and S. Ballandras, " Stable scattering-matrix method for surface acoustic waves in piezoelectric multilayers,'' Appl. Phys. Lett. 80, 2544-2546 (2002).
  © 2002 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Applied Physics Letters and may be found at Th. Pastureaud and al., Appl. Phys. Lett. 80, 2544 (2002).
• (96 ko, pdf) V. Laude, A. Khelif, Th. Pastureaud and S. Ballandras, ``Generally polarized acoustic waves trapped by high aspect ratio electrode gratings on piezoelectric substrates,'' J. Appl. Phys. 90, 2492-2497 (2001).
  © 2001 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in the Journal of Applied Physics and may be found at V. Laude and al., J. Appl. Phys. 90, 2492 (2001)

Optics

• (355 ko, pdf) P. Tournois and V. Laude, ``Negative group velocities in metal-film optical wave-guides,'' Opt. Commun. 137, 41-45 (1997).
• (546 ko, pdf) V. Laude, ``Diffraction analysis of pixelated incoherent shadow casting,'' Opt. Commun. 138, 394-402 (1997).
• (3864 ko, pdf) V. Laude, ``Twisted-nematic liquid crystal active lens,'' Opt. Commun. 153, 134-152 (1998).
• (205 ko, pdf) D. Delautre, S. Breugnot and V. Laude, ``Measurement of the sensitivity of heterodyne detection to aberrations using a programmable liquid-crystal modulator,'' Opt. Commun. 160, 61-65 (1999).
• (2459 ko, pdf) V. Laude and C. Dirson, ``Liquid-crystal active lens: application to image resolution enhancement,'' Opt. Commun. 163, 72-78 (1999).
• A.-S. Morlens, Ph. Balcou, Ph. Zeitoun, C. Valentin, V. Laude, and S. Kazamias, "Compression of harmonic pulses by using chirped mirrors," Opt. Lett. 30 (12), 1554-1556 (2005). Selected by the Virtual Journal of Ultrafast Science 4 (7) (2005).

Mémoire présenté pour obtenir l'Habilitation à Diriger des Recherches (HDR) (2500 ko, pdf, in French)

The HDR is a French diploma enabling its holder to supervise doctoral candidates and to apply for professorship. This document is as of September 2002.

Advanced Signal Processing Lecture Notes (684 ko, pdf, in French)

This document is companion to lectures given at the École Supérieure d'Optique, Orsay, France, from 1995 to 1997. It contains an (somewhat personal and rather mathematical) introduction to Bayesian probability theory applied to parameter estimation, decision theory, and Kalman filtering.

PhD dissertation « Corrélation optique optimale » (5919 ko, pdf, in French)

This PhD in Physics was awarded on December 19, 1994, by Paris XI University, Orsay, France. The dissertation contains an extensive treatment of incoherent shadow-casting correlation and constrained multicriteria optimization of correlation filters. Some parts of the material are not published in regular articles.