ScienceAlert: MIT Has Invented Slightly Eerie Lasers That Transmit Whispers Only
 You Can Hear.
[1]https://www.sciencealert.com/new-tech-from-mit-uses-lasers-to-beam-whispers-o
nly-you-can-hear

References

   1. https://www.sciencealert.com/new-tech-from-mit-uses-lasers-to-beam-whispers-only-you-can-hear