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Orbital Angular Momentum

 
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wolberine
Antenna Theory Regular


Joined: 01 Mar 2011
Posts: 35

PostPosted: Mon Jun 25, 2012 4:53 pm    Post subject: Orbital Angular Momentum Reply with quote

Just an FYI: Looks like orbital angular momentum is popping up on tech blogs again.

Article:

http://www.extremetech.com/extreme/120803-vortex-radio-waves-could-boost-wireless-capacity-infinitely

Paper:

http://iopscience.iop.org/1367-2630/14/3/033001/article
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bigSteve
Antenna Wizard


Joined: 14 Mar 2009
Posts: 265

PostPosted: Mon Jun 25, 2012 9:22 pm    Post subject: Reply with quote

How do they know they aren't just decomposing the wave into two orthogonal polarizations? If they can do it with maybe 10 channels, same frequency, etc I might be less skeptical.
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SM2IUF
Antenna-Theory.com Newbie


Joined: 08 Jun 2012
Posts: 4
Location: Kalix, Sweden

PostPosted: Wed Jul 04, 2012 7:12 am    Post subject: Re: Orbital Angular Momentum Reply with quote

wolberine wrote:
Just an FYI: Looks like orbital angular momentum is popping up on tech blogs again.

Article:

http://www.extremetech.com/extreme/120803-vortex-radio-waves-could-boost-wireless-capacity-infinitely

Paper:

http://iopscience.iop.org/1367-2630/14/3/033001/article


Please correct me if I am misunderstanding the article but my understanding is that they start with a linearly polarized beam and by reflecting the beam via a twisted metallic surface the end result is supposed to be an OAM wave.
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SM2IUF
Antenna-Theory.com Newbie


Joined: 08 Jun 2012
Posts: 4
Location: Kalix, Sweden

PostPosted: Fri Jul 06, 2012 10:23 am    Post subject: Re: Orbital Angular Momentum Reply with quote

SM2IUF wrote:
wolberine wrote:
Just an FYI: Looks like orbital angular momentum is popping up on tech blogs again.

Article:

http://www.extremetech.com/extreme/120803-vortex-radio-waves-could-boost-wireless-capacity-infinitely

Paper:

http://iopscience.iop.org/1367-2630/14/3/033001/article


Please correct me if I am misunderstanding the article but my understanding is that they start with a linearly polarized beam and by reflecting the beam via a twisted metallic surface the end result is supposed to be an OAM wave.


Well it seems my understanding of the experiment is correct. I have found a few more interesting articles on the Internet that can shed more light into these OAM waves.

First http://www.physicstoday.org/resource/1/phtoad/v65/i6/p18_s1 about an experiment with acoustic waves and OAM where they made an ultrasound transducer that produced OAM waves and could actually see that these waves made a disk spin due to the momentum from the OAM wave. Really fascinating.

Also http://www.physicstoday.org/resource/1/phtoad/v57/i5/p35_s1 is of great interest.

It will be interesting to see what practical impact the OAM waves might have outside the academical world.
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