#PhysicsFactlet
Scattering VS Extinction
In #Optics, the concepts of scattering and extinction are closely related. So closely related that many people tend to confuse them.
Imagine to illuminate a small object with a beam of light. If the object is small the scattered field will be essentially a spherical wave, and the total field will be the incident one plus the scattered field.
If we were able to measure directly the field (as we can do in the microwave regime) we could happily stop here, but in optics we can only measure intensities, and the intensity is defined as the time average of the modulus of the Pointing vector. In most cases of interest, the modulus of the Poynting vector is proportional to the modulus squared of the electric field (which explains why we often that a shortcut and just talk about |E|²).
So the quantity we measure is proportional to |Eᵢₙ +Eₛ|², which is the sum of the Poynting vector of the incident field, the Poynting vector of the scattered field, plus the cross terms. These cross terms are what we usually call "extinction" and are the result of the interference between the incident and scattering fields(and the reason why you get a "shadow" behind the scatterer).

#Scattering #Electrodynamics

#PhysicsFactlet
I haven't made a single scientific animation in months. I just don't have the mental space right now.
But I am preparing a series of lectures on scattering for the Plasmonica 2026 School (https://www.plasmonica.it/2026school/), and it feels like a good excuse to make a few new ones.

This one shows a simple finite element simulation of a pulse scattering on a small dielectric obstacle.

#Physics #Optics #Scattering #Diffraction

The McSAS3+GUI (=software for analysing a wide range of practical small-angle scattering patterns) manuscript has been written up and the preprint is available now. Details and a video playlist introducing the software is available on my weblog: https://lookingatnothing.com/index.php/archives/4728

🧪⚛️
#SAXS #X-ray #scattering #software

#DESY #PhotonScience sucht 1 Nachfolger für Oliver:

https://v22.desy.de/e67416/e308946/index_eng.html

* group leader of 11 beamline teams, laboratories and sample environment
* Responsible for the user operation of #PetraIII
* designing and implementing the beamline and support team portfolio within the #PetraIV project

* Excellent knowledge in application of #synchrotron radiation in terms of #diffraction, #scattering and/or related #XRay #imaging techniques (such as diffraction imaging, #Bragg-CDI, tensor #tomograpahy) and the development of methods and instrumentation

#AcademicChatter #AcademicJobs

#SciArtSeptember Day 29: Scattering

I accidentally found this effect while brooming one day, is it scattering the light?
Uploading the vid so you can see how the rings of light change depending on the position of the reflecting metal.

#physics #light #scattering #PhonePhotography

Conferma matematica alla teoria delle stringhe. Le fusioni tra buchi neri mostrano uno strano legame matematico. Un nuovo studio sui buchi neri evidenzia e spiega delle onde gravitazionali: ecco come si applicano teorie matematiche complesse a tutto questo Era il 2015 quando i ricercatori del Laser Interferometer Gravitational-Wave Observatory (LIGO)...

#astrofisica #buchineri #LIGO #ondegravitazionali #scattering #spaziotempo #struttureCalabiYau #teoriadellestringhe

https://scienzamagia.eu/scienza-tecnologia/conferma-matematica-alla-teoria-delle-stringhe/

🌞 One Sun. Two perspectives:

In the void of space 🌌, sunlight shines pure and white. On Earth 🌍, our atmosphere scatters shorter wavelengths, leaving vibrant reds and oranges to paint the horizon at sunrise.

🌌 For more, explore our Cosmic Exploration Series:
🛡️🔗▶️ https://tpc8.short.gy/qSuokXFv

Two views, one source—each shaped by where we stand.

#physics #sunlight #earth #space #atmosphere #scattering #astmosphere #EarthScience #science #ThePerpetuallyCurious

#Blender #GodotEngine #Scattering

Hey,
In  one can use geo-nodes to scatter stuff.

The problem is to apply the modifier, i.e. on export, all those scattered instances turn into geometry - i.e. they are not shared/linked data.

On the  side, I am hacking a plugin to try detect any clue that can help me spot when a scatter is coming in - i.e. I want to capture the transforms of each instance and the mesh data once. So I can make a multimesh.

any ideas?