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LEO Giuseppe

Professeur

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Professeur - Université Paris Diderot

CV (Français)

Giuseppe Leo (né en 1966, marié, 2 enfants) a reçu son diplôme d’ingénieur summa cum laude en 1990 (Rome-Sapienza) et son doctorat en physique en 2001 (Paris-Sud, Orsay). Maître de Conférences puis professeur à l’Université Rome 3 depuis 1992, il est professeur à l’Université Paris Diderot depuis 2004. Il a effectué la plupart de sa recherche dans les domaines de l’optoélectronique et de l’optique non-linéaire, en particulier sur la photonique sur puce AlGaAs. En France, il a dirigé 4 post-docs et 6 thésards. Auparavant, en Italie, il avait encadré 12 thèses de Laurea. G. Leo a publié 67 articles sur des journaux à comité de lecture, 9 chapitres de livre, about 110 actes de conférences, et il a édité un volume et déposé 2 brevets.
Responsable de l’équipe DON du laboratoire MPQ, en 2006 il a fondé et dirigé 2 Licences-Pro à Paris Diderot (“Analyse des matériaux” et “Biophotonique”). Depuis 2008, il a piloté la création de l’Ecole d’Ingénieur Denis Diderot, dont il est à présent le directeur. Dans les dernières années il a coordonné 5 programmes de recherche bilatéraux et participé à 3 projets RTD et à un réseau RTN de l’UE. A présent, il coordonne le projet FET TREASURE du PCRD 7.

CV (English)

Giuseppe Leo (born in Italy in 1966, married, two children) received his MS summa cum laude in EE at La Sapienza University (Rome, 1990) and his PhD in Physics at Paris-Sud University (2001). Since 1992, he was assistant professor at Roma-Tre University, where he became associate professor in 2002. Since 2004 he has been full professor at Paris Diderot University. G. Leo’s research is in optoelectronics and nonlinear optics, with a focus on AlGaAs integrated optics. Since 2005, he has directed 4 post-docs and 6 PhD students. Previously, he had supervised 12 Laurea theses in Italy. He has published 67 articles on peer-reviewed journals, 9 book chapters and about 110 conference papers> Finally, he has edited 1 book and registered 2 patents.
Head of the DON group of the MPQ Laboratory, in 2006 he has founded and directed 2 Professional Schools at Paris Diderot (“Materials analysis” and “Biophotonics”). Since 2008 he has led the foundation of the Denis Diderot School of Engineering, of which he is presently the director. Over the last years, he has managed 5 bilateral programs and participated in 3 RTD projects and 1 RTN network. He is presently the coordinator of the FP7 FET TREASURE Project.

Contact

- giuseppe.leo@univ-paris-diderot.fr
- Tel : 01 57 27 62 27 / 06 67 44 38 73
- Fax : 01 57 27 62 41

- Bureau 707B
- Labo 666A

Adresse

Université Paris Diderot – Paris 7
Laboratoire Matériaux et Phénomènes Quantiques
Bâtiment Condorcet
Case courrier 7021
75205 PARIS CEDEX 13

Thèmes de recherche

- Optique non linéaire, sources paramétriques optiques intégrées
- Dispositifs optiques et optoélectroniques intégrés : conception, fabrication et caractérisation
- Electromagnétisme computationnel : analyse 3D de nanostructures optiques.

Lien : Génération paramétrique de lumière dans les microstructures semiconductrices

Publications

- 2013

S. Mariani, A. Andronico, I. Favero, S. Ducci, Y. Todorov, C. Sirtori, M. Kamp, J. Claudon, J. M. Gérard, X. Wang, P. U. Jepsen, and G. Leo, “AlGaAs Micro-Pillars for THz Difference Frequency Generation”, submitted to IEEE Trans. THz Sci. Technol.

A. Orieux, A. Eckstein, A. Lemaître, P. Filloux, I. Favero, G. Leo, T. Coudreau, A. Keller, P. Milman, and S. Ducci, “Bell states generation on a semiconductor chip at room temperature”, submitted to Phys. Rev. Lett.

K. Iwaszczuk, C. Bisgaard, A. Andronico, G. Leo, and P.-U. Jepsen, “Numerical investigation of terahertz emission properties of microring difference-frequency resonators”, to appear on IEEE Trans. THz Sci. Technol. (2013)

- 2012

C. Baker, S. Stapfner, D. Parrain, S. Ducci, G. Leo, E. Weig, and I. Favero, “Optical Instability and Self-Pulsing in Silicon Nitride Whispering Gallery Resonators”, Optics Express 20, 29076 (2012).

A. Andronico, S. Mariani, F. Ghiglieno, J. Claudon, M. Munsch, J. M. Gérard, I. Favero, S. Ducci, and G. Leo, ‘Tuning of a nonlinear THz emitter’, Optics Express 20, 17678 (2012).

D. Parrain, C. Baker, T. Verdier, P. Senellart, A. Lemaitre, S. Ducci, G. Leo, I. Favero, “Damping of optomechanical disks resonators vibrating in air”, Appl. Phys. Lett. 100, 242105 (2012).

- 2011

M. Savanier, A. Andronico, A. Lemaître, C. Manquest, I. Favero, S. Ducci, and G. Leo, “Nearly-degenerate three-wave mixing at 1.55 μm in oxidized AlGaAs waveguides”, Optics Express 19, 22582 (2011).

C. Baker, C. Belacel, A. Andronico, P. Senellart, A. Lemaitre, E. Galopin, S. Ducci, G. Leo, and I. Favero “Critical optical coupling between a GaAs disk and a nanowaveguide suspended on the chip”, Appl. Phys. Lett. 99, 151117 (2011).

M. Savanier, A. Andronico, A. Lemaître, E. Galopin, C. Manquest, I. Favero, S. Ducci, and G. Leo, “Large Second-Harmonic Generation at 1.55 μm in oxidized AlGaAs waveguides”, Optics Letters 36, 2955 (2011).

L. Ding, C. Baker, P. Senellart, A. Lemaitre, S. Ducci, G. Leo, and Favero, “Wavelength-sized GaAs optomechanical resonators with gigahertz frequency”, Appl. Phys. Letters 98, 113108 (2011).

A. Orieux, X. Caillet, A. Lemaître, P. Filloux, I. Favero, G. Leo, and S. Ducci, “Efficient parametric generation of counterpropagating two-photon states”, J. Opt. Soc. Am. B 28, 45 (2011).

- 2010

L. Ding, C. Baker, P. Senellart, A. Lemaitre, S. Ducci, G. Leo, and I. Favero, “High frequency GaAs nano-optomechanical disk resonator”, Phys. Rev. Lett. 105, 263903 (2010).

E. Guillotel, C. Langlois, F. Ghiglieno, G. Leo, and C. Ricolleau, “TEM characterization of oxidized AlGaAs/AlAs nonlinear optical waveguides”, J. Phys. D : Appl. Phys. 43, 385302 (2010).

X. Caillet, A. Orieux, A. Lemaitre, P. Filloux, I. Favero, G. Leo, and S. Ducci, “Semiconductor ridge microcavity source of quantum light at room temperature”, Optics Express 18, 9967 (2010).

L. Ding, C. Belacel, S. Ducci, G. Leo, and I. Favero, “Ultra-low loss single-mode silica tapers manufactured by a microheater”, Applied Optics 49, 2441 (2010).

- 2009

E. Guillotel, M. Ravaro, F. Ghiglieno, C. Langlois, C. Ricolleau, S. Ducci, I. Favero, and G. Leo ‘Optical parametric amplification in GaAs/AlOx waveguide’ Appl. Phys. Lett. 94, 171110 (2009).

X. Caillet, V. Berger, G. Leo and S. Ducci ‘A semiconductor ridge micro cavity to generate counterpropagating twin photons’ Proc. of SPIE 7222, 72221J (2009).

X. Caillet, V. Berger, G. Leo and S. Ducci ‘A semiconductor source of counterpropagating twin photons : a versatile device allowing the control of the two-photon state’ J. of Mod. Optics 56, 232 (2009).

X. Caillet, L. Bretheau, M. Krakowski, N. Michel, I. Favero, G. Leo and S. Ducci ’Time-resolved thermal crosstalk characterisation of laser diode arrays’ Electr.. Lett. 45,9 - 467 (2009).

- 2008

M. Ravaro, E. Guillotel, M. Le Dû, C. Manquest, X. Marcadet, S. Ducci, V. Berger, and G. Leo "Nonlinear measurement of mid-IR absorption in AlOx waveguides",Appl. Phys. Lett. 92, 151111 (2008).

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, A. G. Davies, "Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers", J. Appl. Phys. 104, 124513 (2008).

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J.-F. Lampin, H. E. Beere, and D.A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna”, Appl. Phys. Lett. 93, 183508 (2008).

A. Andronico, J. Claudon, J.-M. Gérard, V. Berger, and G. Leo, “Integrated terahertz source based on three-wave mixing of whispering-gallery modes”, Opt. Lett., 33 (21), 2416 (2008).

A. Andronico, I. Favero, and G. Leo, “Difference Frequency Generation in GaAs Microdisks”, Opt. Lett. 33 (18), 2026-2028 (2008).

- 2007

M. Ravaro, M. Le Dû, J.-P. Likforman, S. Ducci, V. Berger, and G. Leo, "Estimation of parametric gain in GaAs/AlOx waveguides by fluorescence and second harmonic generation measurements", Appl. Phys. Lett. 91, 191110 (2007).

L. Lanco, S. Ducci, J.-P. Likforman, X. Marcadet, J.A.W. van Houwelingen, H. Zbinden, G. Leo and V. Berger “Semiconductor waveguide source of counterpropagating twin photons” Phys. Rev. Lett. 97, 173901 (2006) article commenté dans Nature Photonics Vol. 1, 94-95 (2007)

L. Lanco, L. Deveaux, S. Ducci, J.-P. Likforman, N. Michel, M. Krakowski, G. Leo and V. Berger “Technique for time-resolved thermal characterization of optoelectronic devices” Electr. Lett. 43,7 - 417 (2007).

L. Lanco, S. Ducci, J.-P. Likforman, P. Filloux, X. Marcadet, M. Calligaro, G. Leo and V. Berger “Time-resolved thermal characterization of semiconductor lasers”Appl. Phys. Lett. 90, 021105 (2007) article sélectionné pour le Virtual Journal of Ultrafast Science Vol. 6 February (2007).

- 2006

L. Lanco, S. Ducci, J.P. Likforman, M. Ravaro, P. Filloux, X. Marcadet, G. Leo and V. Berger “Backwards difference frequency generation in an AlGaAs waveguide” Appl. Phys. Lett. 89, 031106 (2006) article sélectionné pour le Virtual Journal of Quantum Information Vol. 6 August 2006.

L. Lanco, S. Ducci, J.-P. Likforman, X. Marcadet, J.A.W. van
Houwelingen, H. Zbinden, G. Leo and V. Berger, “A semiconductor
waveguide source of counterpropagating twin photons”, Phys. Rev.
Lett
., vol. 97, 173901 (2006)
. Article commenté dans Nature Photonics
Vol. 1, 94-95 (2007).

- 2005

S. Ducci, L. Lanco, Y. Seurin, G. Leo , V. Berger, A. De Rossi and X. Marcadet “Semiconductor sources of twin photons for quantum information” J. of Optics B : Quantum and Semiclassical Optics 7, S158-S165 (2005).

M. Ravaro, Y. Seurin, S. Ducci, G. Leo, V. Berger , A. De Rossi and G. Assanto “Nonlinear AlGaAs waveguide for the generation of counterpropagating twin photons in the telecom range” J. App. Phys. 98, 063103 (2005).

S. Ducci, V. Berger, A. De Rossi, G. Leo and G. Assanto “Integrated twin photon sources in the Si absorption band” J. Opt. Soc. Am. B 22, 2331 (2005).

A. De Rossi, V. Berger, G. Leo and G. Assanto, “Birefringence
Phase Matching : Tuning and Tolerances”, IEEE J. Quantum Electron.,
vol. 41, 1293 (2005)
.

- 2004

L.Colace, G.Leo, A.Amoroso, A.Falco, A.C. Cino and G.Assanto. ’Bi-colour spatial solitons in linearly uncoupled planar waveguides ’
J. Opt. B : Quantum Semiclass. Opt. 6, S217 (2004).

G.Leo, A.Amoroso, L.Colace, G.Assanto, R.V. Roussev, and M.M. Fejer ’Low-threshold spatial solitons in reverse-proton-exchanged periodically poled lithium niobate waveguides ’
Opt. Lett. 29, 1778 (2004).

- 2003

Second Harmonic Generation in coupled LiNbO3 waveguides by reverse proton exchange
IEEE Photon. Techn. Lett. 15, 443 (2003).

Spatial optical simultons in nonlinearly coupled planar waveguides
Opt. Lett. 28, 1031 (2003).

Contraction of Aluminum Oxide Thin Layers in Optical Heterostructures
Appl. Phys. Lett. 83, 2554 (2003).

- 2002

Phase-Matching Engineering in Birefringent AlGaAs Waveguides for Difference Frequency Generation
J. Lightwave Techn. 20, 651 (2002).

Characterization of AlGaAs/AlAs waveguides for optical parametric interactions
J. Opt. Soc. Am. B 19, 902 (2002).

- 2001

Parametric fluorescence in oxidized Aluminium Gallium Arsenide waveguides
Appl. Phys. Lett. 79, 3758 (2001)

Birefringence evaluation in multimodal and multilayer AlGaAs/AlAs waveguides
Appl. Phys. Lett. 78 , 1472 (2001)

- 2000

X-ray and optical characterization of multilayer AlGaAs waveguides
Appl. Phys. Lett. 77, 3884 (2000)

- 1999

Unique properties of quadratic solitons
Acta Phys. Polonica A 95, 691 (1999)

Parametric fluorescence in oxidized AlGaAs waveguides
J. Opt. Soc. Am. B 16, 1597 (1999)

Form birefringence in optical heterostructures for nonlinear frequency conversion
Recent Res. Devel. Appl. Phys. 2, 345 (1999)

- 1998

Analysis of optically amplified mid-infrared parametric generation in AlGaAs waveguides
Opt. Lett. 23, 1823 (1998)

Robust generation, properties, and potential applications of quadratic spatial solitons generated by optical parametric amplification
Opt. & Quantum Electron. 30, 907 (1998)

Three-wave simultons : quasi-particles in quadratic media
J. Nonl. Opt. Phys. & Mat. 7, 345 (1998)

Multiple branching of vectorial spatial solitary waves in quadratic media
Opt. Commun. 146, 356 (1998)

- 1997

Intensity controlled interactions between vectorial spatial solitary waves in quadratic nonlinear media
Opt. Lett. 22, 7 (1997)

Beam pointing control with spatial solitary waves in quadratic nonlinear media
Opt. Commun. 134, 223 (1997)

Phase- and Polarization-Insensitive All-Optical Switching by Self-Guiding in Quadratic Media
Opt. Lett. 22, 1391 (1997)

Bidimensional spatial solitary waves in quadratically nonlinear bulk media
J. Opt. Soc. Am. B 14, 3134 (1997)

Collisional interactions of vectorial spatial solitary waves in type II frequency doubling media”,
J. Opt. Soc. Am. B 14, 3151 (1997)

Dynamics of nonlinear optical properties in InGaAs/InP quantum well waveguides
Phys. Rev. B 55, R4883 (1997)

- 1996

A versatile bistable gate via quadratic cascading in a Bragg periodic structure
J. Opt. Soc. Am. B 13, 661 (1996)

- 1995

Butterfly Bistability in a InGaAs/InP Multiple-Quantum Well Distributed Feedback Waveguide
Appl. Phys. Lett. 67, 585 (1995)

Light-modulated carrier injection across the interface between transparent conductive oxide n+SnO2) and semi-insulating amorphous silicon carbide
J. Non-Crystalline Solids 187, 489 (1995)

Guided-wave optical bistability through nonlinear cascading in a phase-matched distributed reflector
Electron. Lett. 31, 1661 (1995)

- 1994

Electronic Properties of n+-SnO2/a-SiC:H/Au thin-film structures
Solid State Electronics 34, 1937 (1994)

Light-induced defect kinetics in a-Si:H photovoltaic cells according to a non-dispersive carrier recombination model
Solar Energy Mat. and Solar Cells 31, 525 (1994)

Metal/insulator/metal-type structures based on Amorphous carbon-silicon alloys : electronic properties in dark conditions and under illumination
Diamond and Rel. Mat. 3, 874 (1994)

- 1993

Relations among structural and optoelectronic properties in a-SiC:H films with high C content and high photoconductivity
J. Non-Crystalline Solids 164, 1035 (1993)

Structural, optical and electronic properties of wide band gap amorphous carbon-silicon alloys
Diamond and Rel. Mat. 2, 773 (1993)

- 1992

Cherenkov Second Harmonic Generation in Multilayer Waveguide Structures
IEEE J. of Quantum Electron. 28, 534 (1992)