Sébastien M. Popoff

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/90

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

#wavefrontshaping @IES_Cargese youtube.com/watch?v=tKsVy5…

Check out our new @NaturePhotonics paper on the generation of cluster states at record-high rates using high-dimensional entanglement: nature.com/articles/s4156… We use spatial entanglement to reduce the number of photons and feed-forward steps in photonic quantum computation (a 🧵)

@InstLangevin #wavefrontshaping

2. We show a way to find channels with improved RME compared to the average behavior. Interesting for imaging applications! Thanks for reading!

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!

🚨 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/abstract/1…

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/…

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/86 Thanks again Rodrigo Gutierrez Cuevas, @BrombergYaron, and M.W. Matthès. @InstLangevin @ESPCI_Paris

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.

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!

🚨 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/10.1088/2515-7…