Loïc O. Le Cunff

Centre National de la Recherche Scientifique

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Gilles Lérondel

Centre National de la Recherche Scientifique

Renaud Bachelot

Université de Technologie de Troyes

Ali Issa

Université de Technologie de Troyes

Alexandre Vial

Centre National de la Recherche Scientifique

Christophe Couteau

Université de Technologie de Troyes

Tien Hoa Nguyen

Shanghai University

Safi Jradi

Université de Technologie de Troyes

Aurélie Broussier

Centre de Nanosciences et de Nanotechnologies

Dinh Xuan Quyen

Nanyang Technological University

Thierry Pauporté

Institut de Recherche de Chimie Paris

Cooperative Institutions

Centre National de la Recherche Scientifique

Centre de Nanosciences et de Nanotechnologies

Université de Technologie de Troyes

Light, nanomaterials, nanotechnologies

Nanyang Technological University

Canadian Nautical Research Society

Université Paris-Sud

Laboratoire Photonique, Numérique et Nanosciences

Université Paris-Saclay

Marie Curie

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Hybrid plasmonic nanosystem with controlled position of nanoemitters

Applied Physics Letters (2019)

Aurélie Broussier Ali Issa Loïc O. Le Cunff Tien Hoa Nguyen Xuan Quyen Dinh

Quantum dots optically excited in close proximity to a silver nanowire can launch surface plasmons. The challenge related to this promising hybrid system is to control the position of nanoemitters on the nanowire. We report on the use of a two-photon photopolymerization process to strategically position quantum dots on nanowires at controlled sites. A parametric study of the distance between the quantum dots and the nanowire extremity shows that precise control of the position of the launching sites enables command of light intensity at the wire end through surface plasmon propagation.

Position (finance)

10.1063/1.5093360

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Citations (5)

Surface plasmons in suspended graphene: launching with in-plane gold nanoantenna and propagation properties

Optics Express (2017)

David Legrand Loïc O. Le Cunff Aurélien Bruyant Rafael Salas‐Montiel Z. Liu

Graphene physics and plasmonics are two fields which, once combined, promise a variety of exciting applications.One of those applications is the integration of active nanooptoelectronic devices in electronic systems, using the fact that plasmons in graphene are tunable, highly confined and weakly damped.A crucial challenge remains before achieving these active devices: finding a platform enabling a high propagation of Graphene Plasmons Polaritons (GPPs).Suspended graphene presenting ultrahigh electron mobility has given rise to increasing interest.We numerically studied the plasmonic properties of suspended graphene.We propose a hybrid configuration and a set of conditions to launch graphene plasmons via an in-plane gold nanoantenna, for micrometric propagation of surface plasmons in suspended graphene.Finally, we propose a realistic optoelectronic device based on the use of suspended graphene.

10.1364/oe.25.017306

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Citations (7)

Light management in scintillator crystals: a multi-scale computational study (Conference Presentation)

Claudio Silvestre Castro Loïc O. Le Cunff Alexandre Vial Gilles Lérondel

The detection of high energy radiation relies frequently on its conversion to visible or near-ultraviolet light by means of scintillator crystals. As the generated visible light then needs to be detected outside the crystal, it is of paramount importance to model the complete system involving the scintillator, the conversion process and the final detection outside the crystal. In this work we present a general modeling scheme of such detection process. Taking into account the bulk scintillator crystal shape and the precise geometry of the scintillator output interface (at micron or nanometric scale), we evaluate the performance of the system in terms of the number of photons and their spatial distribution on the detector. This numerical tool can be used, for example, to assess the performance of image reconstruction techniques used for Positron Emission Tomography (PET) scanners. The influence of nanostructures placed on top of the output interface on the overall response is analyzed and compared to that of a plane exit surface. Our results indicate that the electromagnetic response of the scintillator output interface plays a crucial role in the final detection.

Crystal (programming language)

Interface (matter)

10.1117/12.2324143

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Citations (2)

Hybrid plasmonic nanosystem with controlled position of quantum emitters (Conference Presentation)

Aurélie Broussier Ali Issa Loïc O. Le Cunff Tien Hoa Nguyen Dinh Xuan Quyen

Presentation (obstetrics)

Position (finance)

Position paper

10.1117/12.2527682

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Citations (0)

Single metafilm effective medium behavior in optical domain: Maxwell–Garnett approximation and beyond

Applied Physics A (2012)

Natalia Dubrovina Loïc O. Le Cunff Shah Nawaz Burokur Rasta Ghasemi Aloyse Degiron

10.1007/s00339-012-7391-7

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Citations (5)

Microscopic defects as the limiting factor in the direct transmission of nanocoatings obtained through self‐assembly

Nano Select (2020)

Loïc O. Le Cunff Hind Kadiri Gilles Lérondel

Abstract Colloidal lithography is a very popular method to achieve large‐scale antireflective coatings. Those sometimes display large a falloff in direct transmission for short wavelengths, which has been linked to scattering. This work proposes, through finite‐difference time‐domain calculations of “supercells,” an explanation of those scattering losses by simulating crystalline defects much larger than the individual microstructures. The results are in agreement with the experimental data, suggesting those defects are indeed the driving force behind this scattering.

10.1002/nano.202000095

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Citations (4)

Unidirectional frequency conversion of surface plasmon polaritons on metal nanowires

Micro and Nano Engineering (2023)

Aurélie Broussier Ali Issa Loïc O. Le Cunff Régis Deturche Tien Hoa Nguyen

Hybrid nanoplasmonics is one of the most promising branch of nanophotonics which aims, in particular, to control the energy transfer between donor and acceptor nano-emitters via surface plasmons. Recently, an approach of nano-emitters positioning was introduced. It is based on two-photon polymerization of a photosensitive material which contains quantum dots as nano-emitters. This technique allowed for the integration of green quantum dots on plasmonic silver nanowires. In this article, we report on the use of this approach for integrating both green and red quantum dots on silver nanowires. The coupling between nano-emitters and propagating surface plasmons that are supported by the silver nanowires is reported and observed through their scattering at the nanowire ends. For both colors, a parametric study of the distance between the quantum dots and the nanowire extremity shows that precise control of the position of the launching sites enables control of light intensity at the wire end, through surface plasmon propagation length. More interestingly, by integrating two kinds of quantum dots on the same nanowire, we realized an efficient donor-acceptor hybrid nano-system, where green surface plasmons polaritons (from donors) are transformed into red plasmons (from acceptors) at controlled sites of the plasmonic guides, as a result of a frequency conversion of the plasmons polaritons.

Nanophotonics

Localized surface plasmon

10.1016/j.mne.2023.100193

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Citations (3)

Phenomenological modelling of light transmission through nanowires arrays

Thin Solid Films (2019)

Junze Zhou Loïc O. Le Cunff Komla Nomenyo Alexandre Vial Thierry Pauporté

Waviness

Phenomenological model

10.1016/j.tsf.2019.01.054

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Citations (5)

Phenomenological modeling of light transmission through ZnO nanowires arrays (Conference Presentation)

Junze Zhou Loïc O. Le Cunff Komla Nomenyo Thierry Pauporté Gilles Lérondel

Among alternative nanomaterials for energy related photonic applications, one-dimensional semiconductor nanowires are of a great interest due to their physical properties coming from electronic or quantum confinement. In particular, ZnO nanowires (or nanorods) has been widely investigated since ZnO has many unique properties such as wide direct band gap, large exciton binding energy and relatively high refractive index. Large optical gain also makes ZnO a well suited material for energy transfer in hybrid systems and especially optical energy transfer. There are however two issues remaining to be addressed, one is related to the control in size and dispersion in nanowires array and the other is related to the modeling of nanowires arrays. In this study, we report on a theoretical study on ZnO nanowires, in order to reach a better understanding of the mechanisms that govern the light propagation in nanowires arrays. A phenomenological model has been developed and discussed. The model is able to describe the experimentally measured light transmission nanowires arrays. A slab of nanospheres and rough layers with thickness waviness were combined to simplify the nanowires structure description. This phenomenological description was proved to be feasible by fitting the experimental data. As a conclusion, light transmitted by randomly distributed nanowires can be explained by the combination of Mie theory and a rough Fresnel reflection at the interfaces.

Nanophotonics

Nanomaterials

10.1117/12.2323538

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Citations (0)

Magnetic mirror metasurface based on the in-phase excitation of magnetic dipole and electric quadrupole resonances

Journal of Applied Physics (2019)

Alma K. González-Alcalde Miguel A. G. Mandujano Rafael Salas‐Montiel Loïc O. Le Cunff Gilles Lérondel

We consider the design of magnetic mirrors that consist of a layer of two-dimensional high-refractive-index dielectric particles. The central idea is to search for conditions for which the electric field of the light backscattered by a single particle has a zero phase difference with respect to the incident field. Employing physical arguments, we conclude that this can occur when the electric dipolar contribution vanishes. Optimizing the form of the cross section, we find a situation in which the vanishing of the dipolar contribution coincides with an in-phase condition for the magnetic dipole and the electric quadrupole contributions. The resulting scattering pattern of the particle resembles that of an electric dipole, with the difference that the forward and backscattered electric fields have opposite signs. Based on these results, we design a metasurface reflector that behaves as a magnetic mirror at a specific wavelength within a wideband spectral response. Subsequently, we extend the results to the design of supported structures where a magnetic mirror condition at a single wavelength is similarly found.

Magnetic mirror

Quadrupole magnet

10.1063/1.5085749

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Citations (16)