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I'm sorry if this is not the correct site for this question; I just found this to be the most pertinent site under the technology tag.

Is there (or is it possible to create) a device that shoots audio over a medium distance (say 50 feet) which can only be heared by one person. Similar to how a laser focuses and radiates a beam of photons in a straight line, the device would vibrate molecules in a narrow beam in the direction pointed. I would imagine that it would have some form of parabolic speaker.

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Yes, and these already exist in various forms, from sound weapons to localised 'personal' audio devices.

The vast majority use a parabolic reflector, as you correctly surmised. Some background here.

But this one uses interesting technology with an array of Ultrasonic speakers which provide interference at the target which is within audible frequencies.

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  • Am I really the only one who finds this ultrasonic technique scary?
    – leftaroundabout
    May 22, 2016 at 23:09
  • It's the high amplitude that's really scary - yes
    – Rory Alsop ♦
    May 23, 2016 at 7:25

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