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The future of electronics is light November 29, by Arnab Hazari, The Conversation A basic design of a light-based chip.
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Arnab Hazari, Author provided For the past four decades, the electronics industry has been driven by what is called " Moore's Law ," which is not a law but more an axiom or observation. Effectively, it suggests that the electronic devices double in speed and capability about every two years.
And indeed, every year tech companies come up with new, faster, smarter and better gadgets.
Specifically, Moore's Law, as articulated by Intel cofounder Gordon Moore, is that "The number of transistors incorporated in a chip will approximately double every 24 months. As they get smaller, they also get faster and consume less electricity to operate.
In the technology world, one of the biggest questions of the 21st century is: How small can we make transistors? If there is a limit to how tiny they can get, we might reach a point at which we can no longer continue to make smaller, more powerful, more efficient devices.
Might it stop growing? Getting close to the limit At the present, companies like Intel are mass-producing transistors 14 nanometers across — just 14 times wider than DNA molecules.
They're made of silicon, the second-most abundant material on our planet. Silicon's atomic size is about 0. Today's transistors are about 70 silicon atoms wide, so the possibility of making them even smaller is itself shrinking.
We're getting very close to the limit of how small we can make a transistor. At present, transistors use electrical signals — electrons moving from one place to another — to communicate. But if we could use light, made up of photonsinstead of electricity, we could make transistors even faster.
My work, on finding ways to integrate light-based processing with existing chips, is part of that nascent effort.
Putting light inside a chip A transistor has three parts ; think of them as parts of a digital camera. First, information comes into the lens, analogous to a transistor's source. Then it travels through a channel from the image sensor to the wires inside the camera.
And lastly, the information is stored on the camera's memory card, which is called a transistor's "drain" — where the information ultimately ends up.
Light waves can have different frequencies. To substitute light as the medium, we actually need to move photons instead.
Subatomic particles like electrons and photons travel in a wave motion, vibrating up and down even as they move in one direction. The length of each wave depends on what it's traveling through. In silicon, the most efficient wavelength for photons is 1. This is very small — a human hair is around micrometers across.
But electrons in silicon are even smaller — with wavelengths 50 to 1, times shorter than photons. This means the equipment to handle photons needs to be bigger than the electron-handling devices we have today.
So it might seem like it would force us to build larger transistors, rather than smaller ones. However, for two reasons, we could keep chips the same size and deliver more processing power, shrink chips while providing the same power, or, potentially both.
First, a photonic chip needs only a few light sources, generating photons that can then be directed around the chip with very small lenses and mirrors.
And second, light is much faster than electrons. On average photons can travel about 20 times faster than electrons in a chip. That means computers that are 20 times faster, a speed increase that would take about 15 years to achieve with current technology.Products.
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IESF is a global conference program for electrical/electronic design engineers, managers and executives.
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