Wavefront shaping techniques in complex media
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- Category: PhD offers
- Published on Wednesday, 08 May 2019 07:56
Multiple PhD positions in optical communications and fiber imaging
Center for Laser Physics, Atomes and Molecules (PhLAM), Lille, France
Optical communications: Towards a better understanding of light scattering and mode coupling mechanisms in few mode optical fibers - Link
Optical communications: Multimodal photonics - dynamic characterization of the transmission channel of a few-mode optical fiber - Link
Advanced THz photonics: Beam manipulation with optical-RF antenna arrays at THz frequencies for point-to-point communication applications - Link
Ultra-miniaturized endoscopes: Specialty optical fiber for ultraminiaturized biomedical endoscopes - Link
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- Category: Highlights
- Published on Monday, 15 April 2019 13:50
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Wavefront shaping in complex media for analog computation [highlight]
[M. W. Matthès et al., Optica, 6 (2019)]
Performing linear operations using optical devices is a crucial building block in many fields ranging from telecommunications to optical analogue computation and machine learning. For many of these applications, key requirements are robustness to fabrication inaccuracies, reconfigurability and scalability. Traditionally, the conformation or the structure of the medium is optimized in order to perform a given desired operation. Since the advent of wavefront shaping, we know that the complexity of a given operation can be shifted toward the engineering of the wavefront, allowing, for example, to use any random medium as a lens.
In [M. W. Matthès et al., Optica, 6 (2019)], we propose to use this approach to use complex optical media such as multimode fibers or scattering media as a computational platform driven by wavefront shaping to perform analogue linear operations. Given a large random transmission matrix representing the light propagation in such a medium, we can extract any desired smaller linear operator by finding suitable input and output projectors. We demonstrate this concept by finding input wavefronts using a Spatial Light Modulator that cause the complex medium to act as a desired complex-valued linear operator on the optical field.
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- Category: Multimode fibers
- Published on Monday, 25 February 2019 16:20
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[tutorial] pyMMF: Simulating Multimode Fibers in Python
Part 1: Step Index Benchmark
I recently published a two-part tutorial on how to find the modes of an arbitrary multimode fiber without or with bending. Based on this tutorial, I published a (still experimental) version of a Python module to find the modes of multimode fibers and calculate their transmission matrix: pyMMF. The goal of this module is not to compete with commercial solutions in term of precision but to provide a way to easily simulate realistic fiber systems. To validate the approach, I use step-index multimode fibers as a benchmark test as the dispersion relation is analytically known (see my tutorial here) and for which the Linearly Polarized (LP) mode approximation yields good results. I focus my attention here on the precision of the numerically found propagation constants.
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- Category: Events
- Published on Monday, 18 February 2019 16:47
Complex Nanophotonics Science Camp 2019
Aug 11th - Aug 14th 2019
Cumberland Lodge
Windsor, United Kingdom
Organizers: Jacopo Bertolotti (University of Exeter, UK), Paloma Arroyo Huidobro (Imperial College London, UK), Giorgio Volpe (University College London, UK), Kevin Vynck (LP2N , Bordeaux, France)
Link: here
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- Category: Events
- Published on Thursday, 14 February 2019 11:22
PIERS2019 Rome Focus/Special Sessions
Disordered Photonics
June 17th - June 20th 2019
Faculty of Engineering - University of Rome "La Sapienza"
Rome, Italy
Organizers: Dr. Pedro David Garcia Fernandez (Catalan Institute of Nanoscience and Nanotechnology - ICN2) and Dr. Jacopo Bertolotti (University of Exeter)
Link: here
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- Category: Events
- Published on Friday, 08 February 2019 14:17
Summer School
Imaging in Wave Physics: Multi-Wave and Large Sensor Networks
Sep 23rd - Sep 27th 2019
Institut d’Études Scientifiques de Cargèse
Corsica, France
Director: Mathias Fink (Institut Langevin, ESPCI, France)
Organizers: Alexandre Aubry, Romain Pierrat, Sébastien M. Popoff (Institut Langevin, CNRS - ESPCI, France)
