Sébastien M. Popoff

Researcher at @InstLangevin @ESPCI_Paris @CNRS.
Account to promote 'Wavefront shaping in complex media'.
Only science (ok... mostly science).

[Sébastien M. Popoff @WFShaping]

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.
https://t.co/AY9kpfLTbc

[Complex Photonics Lab @ComplexPhoton]

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

[Sébastien M. Popoff @WFShaping]

#wavefrontshaping @IES_Cargese
https://t.co/n4jEeKLe54

[Complex Photonics Lab @ComplexPhoton]

Check out our new @NaturePhotonics paper on the generation of cluster states at record-high rates using high-dimensional entanglement:
https://t.co/af7POYsi9v
We use spatial entanglement to reduce the number of photons and feed-forward steps in photonic quantum computation (a 🧵)

[Sébastien M. Popoff @WFShaping]

@InstLangevin #wavefrontshaping

[Physical Review X @PhysRevX]

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

Read https://t.co/IyncccwGXn

@WFShaping @BrombergYaron @GuyPelc @Adv_Imaging_Lab

#PRXOptics

[Sébastien M. Popoff @WFShaping]

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

Thanks for reading!

[Sébastien M. Popoff @WFShaping]

🚨 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 👇🏾
https://t.co/mS1KpgPXBE

[Sébastien M. Popoff @WFShaping]

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!

[Fabrice Lemoult @FabriceLemoult]

Bravo Alexandre Aubry et son équipe de l'@InstLangevin @ESPCI_Paris : passer sur @franceculture pour présenter ses recherches c'est le graal !
https://t.co/xJbksP1ipm

[Sébastien M. Popoff @WFShaping]

#wavefrontshaping

[Dave Phillips @photonPhillips]

New preprint: we show wavefront shaping with a new kind of MEMS megapixel spatial light modulator that has fast pistoning micro-mirrors: https://t.co/uChEkDHyoT (includes code to run it fast). Great effort from project lead José @carl00s01, also with @gsdgordon @joelacarpenter.

[Sébastien M. Popoff @WFShaping]

Our new tutorial on digital micromirror devices (DMDs) for #wavefrontshaping is also available on my website, with added animations and Python code:
https://t.co/El24yEEMDx
Thanks again Rodrigo Gutierrez Cuevas, @BrombergYaron, and M.W. Matthès.
@InstLangevin @ESPCI_Paris

[Sébastien M. Popoff @WFShaping]

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.

[Sébastien M. Popoff @WFShaping]

🚨 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 👇🏾

https://t.co/A7B1yIRsoh

[Sébastien M. Popoff @WFShaping]

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!