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Ashwin Panchapakesan
Worked at Amazon.com
Attends University of Ottawa
Lives in Ottawa
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Ashwin Panchapakesan

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Airwaveguide : While lasers have been used before to send information to satellites, this relatively new discovery is quite fascinating. Fibre optic cables are usually preferred due to having a high refractive index, and with fibre optic cables being encased in material having lower refractive index, it is possible to reflect the light back to the core of the cable, preventing the beam from losing focus. Now researchers are trying to do the same thing with air. How? Read more to figure it out...

Focusing the beam : Milchberg and colleagues' made the equivalent of an optical fibre out of air by generating a laser with its light split into a ring of multiple beams forming a 'pipe'. They used very short and powerful pulses from the laser to heat the air molecules along the beam extremely quickly. Such rapid heating produced sound waves that took about a microsecond to converge to the centre of the pipe, creating a high-density area surrounded by a low-density area left behind in the wake of the laser beams.

Air 'Pipe' : "A microsecond is a long time compared to how far light propagates, so the light is gone and a microsecond later those sound waves collide in the centre, enhancing the air density there," says Milchberg. The lower density region of air surrounding the centre of the air waveguide had a lower refractive index, keeping the light focused. "Any structure [even air] which has a higher density will have a higher index of refraction and thereby act like an optical fibre," says Milchberg.

The findings : The researchers found the signal was 50 per cent stronger than a signal obtained without an air waveguide. The findings show the air waveguide can be used as a "remote collection optic," says Milchberg. "This is an optical fibre cable that you can reel out at the speed of light and place next to [something] that you want to measure remotely, and have the signal come all the way back to where you are."

Article link: http://www.abc.net.au/science/articles/2014/07/23/4049345.htm?topic=energy

Research paper : http://www.opticsinfobase.org/optica/abstract.cfm?uri=optica-1-1-5

Additional link: http://www.sciencedaily.com/releases/2014/08/140819125946.htm

Phys.org link: http://phys.org/news/2014-07-optical-cables-thin-air.html

Main pic: from abc.net.au. Additional pics http://news.discovery.com/tech/gear-and-gadgets/optical-fiber-made-out-of-thin-air-140723.htm and http://www.wired.co.uk/news/archive/2014-07/23/optical-fibres-made-from-air

#science #technology
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Ashwin Panchapakesan

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Couldn't agree more, though I would have bashed OSX more
http://www.marco.org/2015/01/04/apple-lost-functional-high-ground

/via +Nafiul Islam 
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I remember watching a scene once, in a movie called Eagle Eye. A supercomputer was able to recover a conversation in a room, based on the vibrations it noticed in a cup of coffee. I remember thinking that was impossible, Hollywood science.
Today, that's a reality: https://www.youtube.com/watch?v=fHfhorJnAEI&feature=share

#ilovescience  
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Exciting! 
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Turing Molecules: Alan Turning had a theory on how fingers and toes are formed... before the structure of DNA was known. And today, his theories have been proven
http://www.sciencedaily.com/releases/2014/07/140731145839.htm
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Ashwin Panchapakesan

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This Hangout On Air is hosted by Ashwin Panchapakesan. The live video broadcast will begin soon.
Q&A
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Karthik's Engagement
Sun, June 22, 2014, 4:44 AM
Hangouts On Air - Broadcast for free

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Thanks a lot ASWIN Can you make a short version of 10 minutes and upload as here Buffering for 1 hr is very fifficultAll best to you.I am cousin of Neela and Raji
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Ashwin Panchapakesan

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I feel like one side of me is totally out of control
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Ashwin Panchapakesan

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Autocaptioning (more like automatic image descriptions): http://io9.com/computers-wrote-the-caption-for-this-photograph-and-ch-1660450610

Can't wait for this to be all grown up
Computers at Google now have a machine-learning system that can analyze images like the one above and generate captions for them. The phrase used to caption this image? "A person riding a motorcycle on a dirt road." It might not seem like much, but it's actually one hell of an accomplishment.
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The Python creator and Dropbox engineer reflects on his early days in programming
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Good job ash
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Have him in circles
248 people
shiva krishna's profile photo
Arnold Rosenbloom's profile photo
Aun Jaffery's profile photo
lingesh kumar's profile photo
DRA Tamil Nadu's profile photo
Cei Chris's profile photo
Sheridan Martins's profile photo
Yuliya Cherenkova's profile photo
Jacob Gulotta's profile photo
Work
Occupation
Student
Employment
  • Amazon.com
    Software Development Engineer, Intern, 2012 - 2012
  • Research In Motion
    Automated Radio Software Testing, Intern, 2011 - 2011
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Ottawa
Previously
Chennai - Mississauga - Seattle
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Tagline
Neither rain, nor hail, nor broken limbs, nor Blue Screens of Death can keep me from the hacks
Introduction
If I'm not dead, I'm coding
I am not Turing Complete
Bragging rights
Wrote an open-source Evolutionary Algorithm Framework
Education
  • University of Ottawa
    Computer Science, 2011 - present
  • University of Toronto Mississauga
    Computer Science, Logic, Mathematics, 2006 - 2011
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Male
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