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Curiosity0220

Hearing light when shone on MEMS microphones?

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https://www.youtube.com/watch?v=OQHJhUVJGeo&t=169s

In this video, James did an experiment in which he shone a modulated high-powered blue light laser at the MEMS microphone of an iPhone. This created a buzzing noise. We attempted to recreate the experiment using He-Ne laser and green light laser. However, no sound was picked up by our phone. Could someone please explain how the phone being shone at was set up? What additional factors may impact of this experiment? If the result in the experiment was caused by photoelectric effect, then could it be that the frequency of our laser simply isn’t enough to trigger said effect. Working on a deadline for science fair. Any recommendations would be greatly appreciated.

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The laser was chopped, and was also around 1W of power. Did you use similar power levels? The video says it's caused by heating, not the PEE.

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