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Sébastien M. Popoff @WFShaping
Joined June 2020
  • Tweets 299
  • Following 191
  • Followers 442
51 Photos and videos
New tutorial on `ZoomFFT` for speeding up off-axis computation in Python: #optics #Python #digitalholography @InstLangevin WARNING: New posts will only be on BlueSky from now on. wavefrontshaping.net/post/id…

ZoomFFT for speeding up off-axis computation (and more) - Wavefrontshaping.net

How to harness the power of `ZoomFFT` to speed-up 2D Fourier analysis in Python when interested in a narrow frequency range.

wavefrontshaping.net
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Sébastien M. Popoff retweeted
Complex Photonics Lab@ComplexPhoton
8 Dec 2024
1/ We all know that if I can see your eyes, you can see mine. This is thanks to the optical *reciprocity principle*, which states that light paths are reversible. But what if there’s a scattering medium between us, like fog? Can reciprocity still help us “see”? 👁️👁️#Physics
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#wavefrontshaping @IES_Cargese youtube.com/watch?v=tKsVy5ot…

Harnessing disorder and symmetries in multimode fibers - Sébastien...

Conference given by Sébastien Popoff as part of " Wave Propagation ...

youtube.com
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Sébastien M. Popoff retweeted
Complex Photonics Lab@ComplexPhoton
17 Sep 2024
Check out our new @NaturePhotonics paper on the generation of cluster states at record-high rates using high-dimensional entanglement: nature.com/articles/s41566-0… We use spatial entanglement to reduce the number of photons and feed-forward steps in photonic quantum computation (a 🧵)
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🚨 Our latest article on the Rotational Memory Effect (RME) in multimode fibers is out! @InstLangevin @ESPCI_Paris @CNRSingenierie #wavefrontshaping Read the thread🧵for more details 👇🏾 journals.aps.org/prx/abstrac…

Characterization and Exploitation of the Rotational Memory Effect in Multimode Fibers

In an ideal optical fiber, rotating the input cleanly rotates the output. That's not the case in real fibers, thanks to imperfections. Characterization of this effect, however, leads to new practical...

journals.aps.org
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So what? In the rest of the paper we develop two potential applications: 1. From the RME measurement, we can estimate the level and geometry of the disorder. Interesting for manufacturing, quality control, and modeling applications!
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2. We show a way to find channels with improved RME compared to the average behavior. Interesting for imaging applications! Thanks for reading!
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Sébastien M. Popoff retweeted
Fabrice Lemoult@FabriceLemoult
4 Sep 2024
Bravo Alexandre Aubry et son équipe de l'@InstLangevin @ESPCI_Paris : passer sur @franceculture pour présenter ses recherches c'est le graal ! radiofrance.fr/franceculture…

Le microscope matriciel, un nouvel outil pour sonder les tissus biologiques en profondeur

La microscopie optique est limitée par l'épaisseur des échantillons à cause des effets de diffusion multiple des photons. Deux nouvelles études dévoilent les performances du microscope matriciel pour...

radiofrance.fr
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#wavefrontshaping
Dave Phillips@photonPhillips
4 Sep 2024
New preprint: we show wavefront shaping with a new kind of MEMS megapixel spatial light modulator that has fast pistoning micro-mirrors: arxiv.org/abs/2409.01289 (includes code to run it fast). Great effort from project lead José @carl00s01, also with @gsdgordon @joelacarpenter.
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Our new tutorial on digital micromirror devices (DMDs) for #wavefrontshaping is also available on my website, with added animations and Python code: wavefrontshaping.net/post/id… Thanks again Rodrigo Gutierrez Cuevas, @BrombergYaron, and M.W. Matthès. @InstLangevin @ESPCI_Paris
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🚨 Our tutorial on using Digital Micromirror Devices (DMDs) for wavefront shaping is out! With Rodrigo Gutierrez Cuevas, @BrombergYaron, and M.W. Matthès. @InstLangevin @ESPCI_Paris @CNRSingenierie #wavefrontshaping Read thread🧵for more details 👇🏾 doi.org/10.1088/2515-7647/ad…

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3. Mechanical stability DMDs are typically connected to a PCB with a rigid cable, transmitting vibrations from the fan. A simple fix: isolate the cable with foam—boring but effective!
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4. Thermal Stability DMD response changes with temperature, and they heat up over time… You can either engineer a cooling system or wait for it to stabilize after a few hours.
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