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Light in complex nanostructures

The Light in Complex Nanostructures group studies the properties of coherent systems involving multiple and strong scattering of light with individual or ensemble of quantum or classical nano-objects or both. We tackle the problem starting from the elementary level (individual nanoparticles), to the microsystem level (nanoparticles possibly dressed by quantum resonators, small nanoparticle assemblies), towards the mesoscopic scale (metasurfaces with many nanoparticles forming complex macrosystems).

Light in Complex Nanostructures group, 2017
The Light in Complex Nanostructures group in 2017. From left to right: Philippe Lalanne, Wei Yan, Maxime Bertrand, Louis Bellando, Alexandre Gras, Kevin Vynck

CURRENT MEMBERS

  • Denis ARRIVAULT (CNRS Engineer)
  • Maxime BERTRAND (PhD student)
  • Alexandre GRAS (PhD student)
  • Philippe LALANNE (CNRS Research Director & group leader)
  • Armel PITELET (Post-doctoral fellow)
  • Marie-Caroline SOLIGNAC (PhD student)
  • Kevin VYNCK (CNRS Research Scientist)
  • Tong WU (Post-doctoral fellow)

 

ALUMNI

  • Lamis AL-SHEIKH (PhD student)
  • Qiang BAI (Post-doctoral fellow)
  • Louis BELLANDO (Post-doctoral fellow, now at LOMA, Talence, France)
  • Kévin COGNEE (PhD student, now at City University of New York, USA)
  • Alexis DEVILEZ (Post-doctoral fellow)
  • Rémi FAGGIANI (PhD student, now at Greenerwave, Paris, France)
  • Wei YAN (Post-doctoral fellow, now at Westlake University, Hangzhou, China)
  • Jianji YANG (Post-doctoral fellow, now at Finisar Corporation, Oregon, USA)
  • Xiaorun ZANG (PhD student, now at Tampere University of Technology, Finland)

 

OPEN POSITIONS

The group is currently offering 1 PhD position (3 years) or 2 post-doc position (2 years).

2020 postdoc position quasinormal modes.pdf

2020 postdoc position nanoappearance.pdf

Please contact us directly for further details. We also welcome spontaneous applications for post-doctoral positions, PhD positions and internships.

 

GOOD NEWS

  • January 2020: Kévin Cognée successfully defended his PhD thesis entitled "Hybridization of open photonic systems" and realized partly at AMOLF (The Netherlands) under the supervision of Femius Koenderink. Congratulations!
  • December 2019: The group coauthors a Letter published in Nature entitled "A Generalized Theoretical and Experimental Framework for Nanoscale Electromagnetism": Nature 576, 248-252 (2019).
  • November 2019: Kevin Vynck receives the Bronze medal of CNRS.
  • September 2019: The group welcomes Denis Arrivault, a CNRS Research Engineer specialized in computational science.

 

FREEWARES

MAN (Modal Analysis of Nanoresonators)

MAN is an open-source software for analyzing electromagnetic micro and nanoresonators. It is composed of two solvers, QNMEig and QNMPole, which compute and normalize the quasinormal modes (QNMs), i.e. the quality factor Q and mode volume V. QNMEig operates under the COMSOL Multiphysics platform; QNMPole can be used with any frequency-domain electromagnetic solver. These solvers are valued by an increasing number of toolboxes, which allow a transparent analysis of nanoresonators with analytical formulae: reconstruction of the field in the modal basis, scattering and extinction cross-section spectra, LDOS spatial and spectral maps, Purcell factor, multipolar decomposition, generation of second-harmonics, temporal domain analysis … In the present version, the toolboxes are solver dependent; this is formal and with a minor effort, the user using one solver may benefit from the toolboxes developed for the other solver. In future versions, the toolboxes will be shared.

Download MAN

DOI

 

RETOP

RETOP is an open-source Matlab toobox that implements a near-to-far-field transformation for computing the radiation diagram. This transformation is implemented in many electromagnetic software, however for most of them, like COMSOL multiphysics, the transformation is restricted to object surrounded by uniform media (free space). RETOP operates for objects on substrates or buried in stratified media. It can be used to compute the radiation diagram in the superstrate and the substrate . The substrate may support guided modes or surface plasmon modes with metal layers. RETOP additionally computes the in-plane radiation diagram in the guided modes. It just needs the near-field (computed on a rectangular box that contains the object with any full-wave Maxwell’s solver) to compute the radiation diagrams. It is especially relevant for calculating the scattering of nanoparticle on substrates. Special attention is made to the interface with COMSOL Multiphysics.

Download RETOP

DOI

 

RETICOLO

RETICOLO implements the rigorous coupled wave analysis (RCWA) for 1D (classical and conical diffraction) and 2D crossed gratings. It operates under a MATLAB environment and incorporates an efficient and accurate toolbox for visualizing the electromagnetic field in the grating.

 

 

Download RETICOLO

DOI

 

 

CURRICULUM VITAE of PHILIPPE LALANNE

Philippe Lalanne is Research Director at CNRS and is an international expert in computational and nanoscale electrodynamics. He was first involved in the group of Pierre Chavel at l'Institut d’Optique at Orsay. In 1995, he spent a sabbatical year with G.M. Morris at the Institute of Optics in Rochester.

With his colleagues, he has launched new modal theories and improved numerical tools for gratings [JOSA A 1996], waveguides [JOSA A 2001, Opt. Express 2007] and microresonators [PRL 2013, PRB 2018]. He has used these tools to provide deep insight into the physical mechanisms involved in key nanoscale optical phenomena and devices, e.g. light confinement in photonic-crystal cavities [APL 2001, Nature 2004], the extraordinary optical transmission [PRL 2002, Nature 2008, Nature 2012], light interaction with plasmonic nanoresonators [PRL 2013, LPR 2018]. He has pioneered the development of large-NA metalenses [JOSA A 1999, Laser Photon. Rev. 2017] and has designed and demonstrated novel nanostructures with record or completely novel performance in their time, e.g. metalens [JOSA A 1999], slow light injectors [Opt. Lett. 2007], directional plasmon couplers [PRL 2005, Nano Lett. 2011], broadband single-channel photon sources [Nature Photonics 2010].

He has supervised 17 PhD candidates and co-supervised 6 PhD candidates. He is an Associate Editor of Optica, a member of the editorial board of Laser & Photonics Reviews, and is director of GDR Ondes, a broad virtual laboratory that gathers the French community working on acoustic and electromagnetic waves. He is a recipient of the Bronze medal of CNRS and the prix Fabry de Gramont of the Société Française d’Optique. He is a fellow of the IOP, OSA and SPIE. 

 

CURRICULUM VITAE of KEVIN VYNCK

Kevin Vynck is Research Scientist at CNRS and is specialized in the theoretical and numerical modelling of wave transport and scattering in complex media.

With his colleagues, he has provided an original viewpoint on the origin of photonic band structures of periodic dielectric rod arrays [PRL 2009], unveiled the impact of structural correlations in disordered media on light transport, localization and trapping [Nature Materials 2012; Nature Materials 2014PRL 2014], developed knowledge on light propagation and weak localization in disordered media containing large-scale (fractal) heterogeneities [PRL 2010; PRL 2012; PRE 2013], elaborated a theory on the polarization and spatial coherence of light in disordered media [PRA 2014; PRA 2016], and developed a novel numerical method allowing for efficient multiple light scattering calculations by large ensembles of non-spherical particles embedded in optical stacks [JOSA A 2020].

He has co-authored 40 papers in international peer-reviewed journals, 1 book chapter and 3 patents. He is PI of the Young Researcher ANR projet NanoMiX ("Nanophotonics of complex media: new modeling tools towards new optical phenomena") and coordinates the modeling activity in the collaborative ANR project Nano-Appearance ("Complex Nanostructured Surfaces for Visual Appearance Design"). He animates Axis 3 ("Modeling") of the GDR APPAMAT, which federates the french scientific community working on the appearance of materials, surfaces and objects. At LP2N, he is a member of the Board of the Laboratory Council. In 2019, he was awarded the CNRS Bronze Medal.

 

COURSES

Master 1: optical waveguides
  1. Chapter 1: Macroscopic Maxwell’s equations
  2. Chapter 2: Introduction to optical waveguide modes
  3. Chapter 3: Classical waveguide geometries
  4. Chapter 4: Theory of optical waveguides
  5. Chapter 5: Pulse propagation in waveguides

Download course optical waveguides

Master 2: Optical artificial materials
  1. Outline
  2. Introduction (slides)
  3. Chapter 1 Bloch modes
  4. Chapter 2 Equivalence between subwavelength gratings and homogeneous thin films
  5. Chapter 3 Metamaterials & metasurfaces
  6. Chapter 6 Plasmonics

Download course optical metasurfaces

DISCUSSION - FORUM - SHARED MIND

  1. Metalenses at visible wavelengths: Laser Photon. Rev. 11, 1600295 (2017). The article makes an historical perspective on high-NA metalenses, rehabilitating pionneer works well before the celebrated Report published in Science (vol. 352, June 2016) by the Harvard group, "Metalenses at visible wavelengths: diffraction-limited focusing and subwavelength resolution imaging".
  2. Structural slow waves: ACS Photon. 6, 4-17 (2019). The article provides a comparison between photonic and plasmonic modes, helping understanding structural slow light with both its facets.

Download the articles

 

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