Search results for "Champ proche optique"
showing 8 items of 8 documents
Pas de titre en anglais
2010
Within the quick nano-fabrication techniques evolution and the increasing needs in low space and energy opto-electronic functions on-chip integration, studies and control of electromagnetic resonances of sub-micrometric objects are crucial issues. One aim of this work was then to improve our knowledge of the light-matter interaction. To this end, optical near-field experiments and complementary numerical development of models have been performed to study electromagnetic resonances due to light-matter interaction in sub-micrometric resonators. As an introduction, the first part of the manuscript presents the main phenomena involved in near-field optical microscopy and the used SNOM operation…
On chip optical nanotweezing for dielectric particles manipulation
2014
On chips optical nanocavities have become useful tools for trapping and manipulation of colloidal objects. In this thesis we study the nanocavities as building blocks for optical forces, trapping and handling of particles. Proof of concept of trapping dielectric microspheres appears as the starting point of the development of lab on chip. In the first chapter we go through the literature of optical forces in free space and integrated optics. The second chapter presents the experimental tools for the characterization of nanocavities and the set-up developed to perform optical measurements with the colloidal particles. The third chapter describes the proof-of-concept trapping of polystyrene p…
Trapping and manipulation of colloidal objects using silicon photonic structures integrated into optofluidic chips
2016
Near-field optical forces arise from evanescent electromagnetic fields, such as in the near-field of photonic waveguides and nanocavities where light is highly confined. These contactless forces can be advantageously used to trap and manipulate micro- and nano-objects in solution. This thesis aims at studying these intriguing interactions and investigating their potential applications. The first chapter is an introduction to the fields of colloidal systems and optical trapping, more especially using near-field optical forces. The second chapter presents the experimental setup and the process used to fabricate optofluidic chips with microfluidic channels. The trapping potential experienced b…
Étude et manipulation de modes résonants en champ proche optique
2010
Within the quick nano-fabrication techniques evolution and the increasing needs in low space and energy opto-electronic functions on-chip integration, studies and control of electromagnetic resonances of sub-micrometric objects are crucial issues. One aim of this work was then to improve our knowledge of the light-matter interaction. To this end, optical near-field experiments and complementary numerical development of models have been performed to study electromagnetic resonances due to light-matter interaction in sub-micrometric resonators. As an introduction, the first part of the manuscript presents the main phenomena involved in near-field optical microscopy and the used SNOM operation…
PLASMONIQUE MOLÉCULAIRE : SPECTROSCOPIE SUR SURFACE MÉTALLIQUE ET MATÉRIAUX HYBRIDES POUR LA PHOTONIQUE INTÉGRÉE
2009
Ce document synthétise mes travaux de recherches sur la période 2002-2009. Les axes majeurs de mon activité portent sur le couplage de molécules avec des particules métalliques, supportant des modes plasmons (SPP) : - Microscopie et spectroscopie optiques en champ proche, - Relaxation moléculaire par couplage aux plasmons, en particulier, la possibilité de modifier les propriétés d'émission de molécules par couplage avec des structures métalliques, – Composants plasmoniques pour la photonique intégrée, où, à l'inverse, l'ingéniérie de matériaux optiques (polymères dop´es, non linéaire, . . .) permet de contrôler la propagation de SPPs le long de films métalliques. Finalement, je démontrerai…
Hyperspectral near-field imaging : development and applications to nanophotonics devices
2013
The scanning near-field optical microscopy (SNOM) is used to analyze optical phenomena at the sub-wavelength scale such as light localization and propagation in photonic crystals or plasmonic devices. In any case, SNOM experiments rely on the positioning of a local probe in the optical near field of a given structure and on the detection of the surrounding evanescent waves. Depending on the nature of the probe or on the optical detection method, the detected physical properties are the spatial distributions of the amplitude and phase or the intensity of the electric and magnetic components of the probed field. We present here the implementation of an innovative hyperspectral near-field imag…
Interaction en champ proche entre une sonde nanométrique et le champ de composants à cristal photonique:- interaction faible, microscopie spatialemen…
2008
With the improvement of fabrication techniques, the nanophotonics and more especially the photonics crystals which are periodic structure at the Wavelength scale have been recently developed. In this work, by using a scanning near-field optical microscope, we study such components. Firslty, we use the local probe to visualize the light distribution inside photonic crystal microcavities etched into semiconductor III/V. We focus us on the explanation of the near-field maps formation and on the probe influence on these maps. Thus, we have visualize degeneracy splitting of optical cavity modes and clearly observed in near-field cavity modes which were not visible in far-field. Moreover, in the …
Etude en champ proche et en champ lointain de composants périodiquement nanostructurés : cristaux photoniques et tamis à photons
2004
Recently, a new class of optical components is appeared. Its main characteristic is to be formed by a periodical sub-wavelength pattern, leading to the apparition of a spectral domain where propagation of light inside the structure is forbidden -- a photonic bandgap. This work is devoted to the study in the near- and far-field of two kinds of periodical optical components: photonic crystals (PCs) and nanostructured metallic films that exhibit the so-called enhanced transmission. First, we study two-dimensional PCs with a scanning near-field optical microscope (SNOM) in collection mode. With this SNOM, we directly map the intensity distribution inside PC-based microcavities. We also evidence…