Watch a video of the amazing hologram in action.
but also hear and even feel — and they pulled it off by drawing on some vintage tech.on their device, which they call the Multimodal Acoustic Trap Display , in the journalThe device works by using ultrasound waves to trap and move a two millimeter-wide polystyrene bead around in midair. The bead traces out an object's shape in three dimensions while LEDs shine red, green, and blue light on it.
“Our new technology takes inspiration from old TVs which use a single color beam scanning along the screen so quickly that your brain registers it as a single image," researcher Ryuji Hirayama said in a. "Our prototype does the same using a colored particle that can move so quickly anywhere in 3D space that the naked eye sees a volumetric image in mid-air.”
"Even if not audible to us, ultrasound is still a mechanical wave and it carries energy through the air," researcher Diego Martinez Plasencia said in the press release. "Our prototype directs and focuses this energy, which can then stimulate your ears for audio, or stimulate your skin to feel content."
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