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Category: Postdoc offers

Published on Monday, 11 November 2013 01:02

PostDoctoral position in experimental optics and nano-photonics

Langevin Institute, Paris, France

Contact: Patrix Sebbah ()

Link: here

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Category: Wavefront shaping talks

Published on Wednesday, 13 November 2013 16:42

Imaging through opaque layers

 TedxTwenteu - Simon Huisman

Friday, 11 October, 2013

Abstract:
Simon Huisman, a recent doctoral graduate with both the COPS and OS group at the University of Twente, talks about an interesting phenomenon which earned the COPS group a picture on the cover of Nature: imaging through opaque layers. With a live setup Simon shows us that with the aid of lasers it is possible to look through opaque objects (e.g. milk or paper) and will he talk about the consequences of this new technology.

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Category: Events

Published on Sunday, 10 November 2013 23:37

Workshop "Waves in complex media"

Dec 11th - 13th, 2013

CNRS campus, Grenoble, France

GDR Mesoimage

Link: here 

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Category: Events

Published on Monday, 11 November 2013 00:53

Workshop "Waves in complex media"

Dec 11th - 13th, 2013

Institut Scientifique de Cargèse, Corsica, France

Organized by: Sergey Skipetrov (Grenoble), Frank Scheffold (Fribourg) and Diederik Wiersma (Florence)

GDR Mesoimage

Link: here

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Category: Phase measurement

Published on Thursday, 10 October 2013 22:16

Off-axis holography [tutorial]

Off-axis holography is a popular technique to reconstruct a hologram. It allows retrieving the amplitude and the phase of a field pattern by measuring only one image with a digital camera. It relies on an intereferometric setup with a non-zero angle between the reference beam and the signal beam and requires to numerically filter the spatial frequencies.

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Category: Highlights

Published on Monday, 09 September 2013 23:24

Imaging with nature: Using a scattering medium as a universal scrambler for imaging by compressed sensing [highlight]

[A. Liutkus et al., arXiv, 1309.0425, (2013)]

The idea of compressive sensing is to acquire an image with fewer measurement that dictated by the Shannon-Nyquist theorem. In other words, an image divided in "pixels" can usually be reconstructed using less measurements than the total number of pixels. To do so, one need a way to mix the information, so that any measurement contain at least a bit of information on any input element. Previous implementation of compressive sensing consisted in artificially designing a hardware and a sampling procedure to generate randomness. In the present paper, the authors shows that one can use a random scattering medium as a universal image scrambler. The light reflected from an image propagates through a layer of white paint and the field is measured on different receptors on the other side of the sample. By previously measuring the transmission matrix, the authors shows that sparse images can be successfully reconstructed using compressed sensing techniques taking advantage of the randomness generated by multiple scattering.

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