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According to US scientists, LASERS could forward messages directly to the listener's ear, for example "whispering a secret by far".
The laser interacts with the water vapor in the air, while the scientists create in a localized place sounds powerful enough to be captured by the human audience if they were directed towards the listener's ear.
Getty – Contributor
This is the first time that this technique is used safely around humans, explain the scientists.
It is hoped that directed sounds can one day be used to watch television without a headset without disturbing others.
They can also warn people of danger discreetly in situations like an active shooter attack.
The laser will not cause burns to the eyes or the skin because scientists have determined the exact level of wavelength that avoids any risk.
The researchers tested the setup on themselves in a lab, placing their ears near the beam to capture the sound, Science News reported.
Physicist Charles Wynn said, "You move your head, and there's a few inches of space where you go." Oh, here she is! "… it's pretty cool."
Microphones have also been used to capture the sounds produced.
Whistling Afar
The photoacoustic effect, in which the light pulses are converted into sound when absorbed by a material, allows this unprecedented phenomenon to occur.
The researchers tested two different techniques to get the sounds.
The first technique is to rapidly increase the intensity of the laser beam, which transmits voices and songs.
Physicist Ryan Sullenberger said, "You can really hear the music; you can understand what people are saying. "
The second method was to use a rotating mirror while the researchers scanned the laser beam in an arc.
Noise was heard only at the distance along the beam where the light pbades at the speed of sound.
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The noise sounds like a buzzing bug, unable to send complex messages.
The researchers aim to improve this targeted method of sending detailed audio messages and to increase the working distance.
But the physicist Jacob Khurgin admitted: "This is not a practical means of communication, but a very neat demonstration proving the power of photoacoustics"
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