Created by sebastien.popoff on 24/10/2014

Tutorials Spatial Light Modulators

How to use a binary amplitude Deformable Miror Device (DMD) as a phase modulator: The "superpixel" method

 

I previously presented a technique based on the Lee hologram that allows to use a binary amplitude modulator (like a DLP chip you find in standard projectors) to perform a phase modulation (or amplitude and phase modulation). Recently, a new technique was introduced in [S.A. Goorden et al., Opt. Express (2014)] that allows an accurate complex modulation with less loss in term of spatial resolution. This post is more a highlight on this paper than a proper tutorial. In a nutshell, while the Lee hologram only takes advantage of one dimension to encode the amplitude and phase in fringes, this technique exploits both dimensions of the pixel array using superpixels.

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Created by sebastien.popoff on 01/07/2014

Highlights

From diffusive to ballistic-like transport in absorbing media

[S.F. Liew et al., Phys. Rev. B, 89, (2013)]

Intuitively, absorption of light is detrimental for imaging as it reduces the intensity of the image we see. On the other hand, scattering is also a known obstacle for imaging as it mixes light sending it in all the directions. In the present paper, S.F. Liew and his collaborators from Yale University (CT, USA) and the University of Twente (The Netherlands) show that, contrary to appearances, absorption can in fact help light to follow a direct path through disordered media.

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Created by sebastien.popoff on 23/06/2014

Talks Wavefront shaping

Maximally efficient imaging through multimode fiber

 Joel A. Carpenter

CLEO 2014, San Jose, CA, USA
Thursday, 12 June, 2014


Abstract:
Polarization diverse images are generated at the end of a multimode fiber using spatial light modulators to completely characterize propagation through the fiber in terms of the eigenmodes.
http://dx.doi.org/10.1364/CLEO_SI.2014.STh1H.3

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Created by sebastien.popoff on 13/05/2014

Talks Wavefront shaping

Photoacoustic Imaging with Coherent Light

Emmanuel Bossy

Workshop: Inverse Problems and Imaging, Paris
12 February 2013

Hosted by Yves Capdeboscq

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