Konstantin Bliokh: Optical angular momentum opens up new dimensions of light

Angular momentum represents additional degrees of freedom in lighting.
SPIE Optics + Photonics Symposium - spie.org/op
Konstantin Bliokh is a research scientist at the Center for Emergent Matter Science (CEMS) in RIKEN (Japan). His ongoing research areas include geometric phases; spin-orbit interactions; momentum and angular momentum; quantum vortices; relativistic wave equations; wave propagation, localization, and scattering in inhomogeneous media; quantum weak measurements; plasmonics and metamaterials; and coupling and resonances.
Bliokh received his MSc and PhD degrees in physics from Kharkov National University (Ukraine) in 1998 and 2001, respectively. He then worked at the Institute of Radio Astronomy (Ukraine) and collaborated with a number of scientific groups worldwide.
He was a post-doctoral fellow at Bar-Ilan University (Israel) from 2003 to 2005, a visiting research scientist at Technion-Israel Institute of Technology in 2007, a Linkage International research fellow at the Australian National University from 2008 to 2009, and a Marie Curie research fellow at the National University of Ireland from 2009 to 2011.
Bliokh's acheivements include the theory of spin Hall effect and other spin-orbit interaction phenomena for light; prediction and theory of electron vortex beams; and description of the extraordinary transverse spin and momentum in inhomogeneous optical fields. His scientific results have been published in 84 peer-reviewed full-length papers, reviews, book chapters, and have been presented in numerous conferences and workshops.
Images Courtesy of Nature.

[@GeoffryGifari]

Just noticed that the pattern on his T-shirt matches one of the illustration for OAM light

[@charlesstevenson3779]

How come there are so few videos explaining this technology on TH-cam? Would it possible to upload lectures as a podcast?

[@GeoffryGifari]

Can the "orbital angular momentum vector" of light point *opposite* to its spin (polarization) vector?

[@tomnoyb8301]

Ok, but what distinguishes spin from (circular) polarization?

[@DougMarlowe]

Dear Konstantin,
In 1992, I was working at Anixter. A company called Silk Road introduced me to a system which acted upon the angular momentum of the photon. I examined their patent, which at the time seemed to require a precise degree of stability in order to work. I called their reference account in California who corroborated that they were able to "encode" and "decode" 87 rotational coordinates for photons of a certain wavelength. In essence, they had produced a combined throughput of 87Gbps on a single fiber of one wavelength, 1310nm, I believe. Are you aware of this?

[@OLDWVLF]

did you ever get a response?

[@Greg_Chase]

Since a beam of light like shown at time 0:48 has both magnetic and electric field - if you replace the beam of light with a thin electron beam, why does the electron beam make such a larger magnetic field?
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[@washimontacoloridaho]

not sure tbh what your asking, but if you are wondering why photons vs electron beams don't produce the same magnetic field strengths its due maxwell's equations of electromagnetism in which electric flux produces a magnetic field and magnetic flux produces an electric field! a beam of electrons produces quite a large electric flux, which results in a large magnetic field because electrons carry an electric charge, and a moving electric charge produces a magnetic field...photons don't carry charge, so there ins't "extra magnetic field strength" due to the moving of a charge-less photon! im prob wrong though, and you prob know this cause your looking up videos on optical angular momentum

[@Greg_Chase]

@@washimontacoloridaho I'm trying to come to an understanding of the exact physical nature of this difference, in trying to reconcile how the Poynting vector applies to electron beams, EM waves and electric circuits.
When an electric circuit is turned on, electric and magnetic fields shoot down the circuit's copper wire at light speed (electrons travel much more slowly in the wire, which is another matter).
And in an EM wave, the Poynting vector also applies, it's simply that there is no electron-rich wire. The Poynting vector accounts for the flow of energy of the crossed E and M fields.
And the same holds for an electron beam in terms of the Poynting vector.
The physical manifestation of the 3 Poynting cases above is pretty wild to me. Just trying to come to grips with the idea.
Since optics also deals with EM waves, the Poynting vector describes the energy flow that allows us to see.
But the difference in magnitude is puzzling. Consider laser light. Much larger Poynting vector energy transfer. Yet still no electrons.
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[@hgfuhgvg]

Isn't SAM a special case of OAM where the orbit radius is 0

[@kaselandreas2408]

so for sure he knows beth's experiment ?