Light-Bending Silicon Chip From Caltech Can Make Lens-Free Projector Of Your Smartphone
Wed, 12 Mar 2014
Here's how it works - Phase shifters are employed to make the OPA chip change the speed of the light waves and thus the direction of the light beam. Electronic data from a computer are converted into multiple electrical currents - to form an image. The timed light waves are then delivered to tiny array elements within a grid on the chip. The light is then projected from each array in the grid, the individual array beams combining coherently in the air to form a single light beam and a spot on the screen. The rapidly steering electronic signal and the light acts as "a very fast pen" that draws an image made of light on the projection surface.
To explain the working, Hajmiri gives an example of 10 people kneeling in line by a swimming pool. If they slap the water at the exact same instant, they will make one big wave that travels directly away from them. But if the 10 separate slaps are triggered one after the other with a gap of half a second each, there will still be one big, combined wave, but with the wave bending to travel at an angle. That's how the light-bending silicon chip works.
Professor Ali Hajimiri and his team's success lies in making it all work on one-millimeter-square silicon chip. From the results that the researchers have got so far, the images projected on the screen are really simple ones - such as alphabets or a smiley face. However, they are working on larger chips that include more light-delivering array elements to improve the resolution and increase the complexity of the projected images (the same way bigger lenses do with traditional projectors). They are doing experiments with silicon right now which works better with infrared light. To project visible light, the compound semiconductor III-V technology can be used upon the same architecture.
Take a look at the following video that shows a triangle shape projected using Hajimiri's optical phased array chip. The image shown was projected in infrared light -
According to Hajimiri, if this silicon chip is integrated in a smartphone it can act as a projector all by itself. And that's not it. The chips opens a lot more possibilities and a wide range of applications. The researchers recently presented their work at the Optical Fiber Communication (OFC) conference in San Francisco. How do you like the idea of Projector in a smartphone? Share with us in comments below.
Source: CalTech Research
4 years ago
Here we go -
1. Spice m9000 Popkorn Phone -https://www.crazyengineers.com/threads/spice-launches-m-9000-popkorn-mobile-with-projector.63456/
2. Micromax X40 - https://www.crazyengineers.com/threads/micromax-x40-projector-phone-launched.64281/
3. iBall Andi 4a - https://www.crazyengineers.com/threa...pecs-reveal-jelly-bean-projector-phone.70438/
4 years ago
Phase shifters areIsn't speed of light a constant?
employed to make the OPA chip change the
speed of the light waves and thus the direction of
the light beam.
4 years ago
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