[General] Twisted Vortex LIght

[Francois Henault]

Dear Wolf and All,

Vortices are a quite fascinating subject for optical engineers. I 
recently published a paper (attached to this mail) about tailoring 
wavefronts in order to generate null irradiance along the optical axis 
of a system. This is a pure wave optics approach, light quanta are not 
needed.
The question of their effect on Young’s fringes is very interesting. I 
performed quick simulations with my own wave optics model that produce 
the attached images. You should see:
1 - Usual Young’s fringes
2 - Young’s fringes with similar vortex beams of both holes. Fringes 
themselves are unchanged, only their luminous envelope is modified
3 – Same as 2, but adding a Pi phase-shift at one of the two holes. 
Forked fringes are appearing, which is in agreement with the (many) 
existing experimental results and literature.
I take this opportunity to regret that our SPIE conference “The nature 
of light: What are photons?” no longer exists, because I would certainly 
have submitted a communication on that topic. Chandra, is there a chance 
that this conference returns in 2019 ?

Best Regards,
Francois


Le 07/04/2018 à 01:56, Wolfgang Baer a écrit :
>
> to All
>
> I was just at the TSC conference where twisted light creating vertexes 
> was proposed for penetrating tissue
>
> The pictures presented clearly showed light beams with doughnut shaped 
> propagation wave fronts.
>
> https://physics.aps.org/articles/v9/105
>
> https://www.ncbi.nlm.nih.gov/pubmed/28964247
>
> I asked the presenter if double slit experiments or single photon 
> experiments had been done with these light forms. Apparently  the 
> angular momentum of light is theoretically found when solving 
> Maxwell's equations in cylindrical coordinates , but currently uses 
> are for intense beams, but there is no obvious reason low intensity 
> beams could not show the same phenomena.
>
> The question of the wave front size of light came up and it was agreed 
> that this was an open question. I know in our group we have discussed 
> whether the wave front is contained in the apparatus and thereby the 
> properties of photons cannot be separated from the propagation 
> environment boundary conditions.
>
> Could gravity also form vortecies? Even more intriguing could a 
> vombination of gravitational and electric fields produce vortecies?
>
> Anyone know more about this?
>
> Wolf
>
> Dr. Wolfgang Baer
> Research Director
> Nascent Systems Inc.
> tel/fax 831-659-3120/0432
> E-mailwolf at NascentInc.com
>
>
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-- 
__________________________________

François Hénault
Ingénieur de Recherche
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
UMR CNRS 5274
Bâtiment OSUG-A, Porte 65
414, Rue de la Piscine
Université Grenoble-Alpes - B.P.53
F-38041 Grenoble Cedex 9
Tel: +33 (0)4 76 63 57 78
__________________________________

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