Boffins stumble upon method to make silicon control lasers
(2021/04/28)
- Reference: 1619588232
- News link: https://www.theregister.co.uk/2021/04/28/scientists_looking_for_quantum_discovery/
- Source link:
Researchers in a team led by the University of Surrey reckon they have accidentally found a new way to use silicon as a powerful photonic informational manipulation material, potentially making it possible to produce viable silicon devices that can control multiple lasers.
The discovery could be significant because silicon is a fabulous semiconductor yet it has long been thought to be a poor choice for photonics applications. The researchers behind this work say nobody has bothered to commercialise silicon light-emitting diodes, lasers, or displays.
[1]
However, the industry has long dreamed of achieving practical silicon photonics, devices built on silicon that offer both electronic and optical interconnects. Such machines promise both to speed up computer networking and processing, and to take advantage of the world's substantial investment in silicon-based manufacturing processes.
Ben Murdin, co-author of the study and a physics professor at Surrey Uni in England, explained the discovery in a [2]canned statement on Tuesday:
[3]
Our finding was lucky because we weren't looking for it. We were trying to understand how a very small number of phosphorus atoms in a silicon crystal could be used for making a quantum computer and how to use light beams to control quantum information stored in the phosphorus atoms.
We were astonished to find that the phosphorus atoms were re-emitting light beams that were almost as bright as the very intense laser we were shining on them.
The good optics of silicon photonics: Light sailing serenely down a fibre [4]READ MORE
The science behind it boils down to nonlinearity: by filtering the beam through a material, one changes the wavelength, affecting things like color and even making nonvisible light visible. This is basically how green laser pointers work, an invisible infrared diode's output is modified by a nonlinear crystal and voila , the wavelength is halved, and it's visible as green.
But nonlinear optics doesn't stop there: it can also be used to control the direction of the beam's information. Furthermore, stronger nonlinearities are easily controlled with weaker input beams and the researchers discovered that silicon possesses the strongest nonlinearity of its type ever found.
As the boffins put it in their [5]paper , published in the journal Light: Science and Applications :
The immediate implication of our results is the efficient generation of intense coherent THz light via upconversion (also a χ(3) process), and they open the door to exploitation of non-degenerate mixing and optical nonlinearities beyond the perturbative regime.
[6]
Funnily enough, the researchers had shelved the data for a few years after their first observations while they scratched their heads on how to prove the origin of the beams, we're told. Now, they've presented their findings. ®
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[1] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2YIkyQVDIVOGy9EypeelMAgAAAEo&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0
[2] https://www.eurekalert.org/pub_releases/2021-04/uos-sst042721.php
[3] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33YIkyQVDIVOGy9EypeelMAgAAAEo&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0
[4] https://www.theregister.com/2021/02/01/the_good_optics_of_silicon/
[5] https://www.nature.com/articles/s41377-021-00509-6#Abs1
[6] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44YIkyQVDIVOGy9EypeelMAgAAAEo&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
[7] https://whitepapers.theregister.com/
The discovery could be significant because silicon is a fabulous semiconductor yet it has long been thought to be a poor choice for photonics applications. The researchers behind this work say nobody has bothered to commercialise silicon light-emitting diodes, lasers, or displays.
[1]
However, the industry has long dreamed of achieving practical silicon photonics, devices built on silicon that offer both electronic and optical interconnects. Such machines promise both to speed up computer networking and processing, and to take advantage of the world's substantial investment in silicon-based manufacturing processes.
Ben Murdin, co-author of the study and a physics professor at Surrey Uni in England, explained the discovery in a [2]canned statement on Tuesday:
[3]
Our finding was lucky because we weren't looking for it. We were trying to understand how a very small number of phosphorus atoms in a silicon crystal could be used for making a quantum computer and how to use light beams to control quantum information stored in the phosphorus atoms.
We were astonished to find that the phosphorus atoms were re-emitting light beams that were almost as bright as the very intense laser we were shining on them.
The good optics of silicon photonics: Light sailing serenely down a fibre [4]READ MORE
The science behind it boils down to nonlinearity: by filtering the beam through a material, one changes the wavelength, affecting things like color and even making nonvisible light visible. This is basically how green laser pointers work, an invisible infrared diode's output is modified by a nonlinear crystal and voila , the wavelength is halved, and it's visible as green.
But nonlinear optics doesn't stop there: it can also be used to control the direction of the beam's information. Furthermore, stronger nonlinearities are easily controlled with weaker input beams and the researchers discovered that silicon possesses the strongest nonlinearity of its type ever found.
As the boffins put it in their [5]paper , published in the journal Light: Science and Applications :
The immediate implication of our results is the efficient generation of intense coherent THz light via upconversion (also a χ(3) process), and they open the door to exploitation of non-degenerate mixing and optical nonlinearities beyond the perturbative regime.
[6]
Funnily enough, the researchers had shelved the data for a few years after their first observations while they scratched their heads on how to prove the origin of the beams, we're told. Now, they've presented their findings. ®
Get our [7]Tech Resources
[1] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2YIkyQVDIVOGy9EypeelMAgAAAEo&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0
[2] https://www.eurekalert.org/pub_releases/2021-04/uos-sst042721.php
[3] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33YIkyQVDIVOGy9EypeelMAgAAAEo&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0
[4] https://www.theregister.com/2021/02/01/the_good_optics_of_silicon/
[5] https://www.nature.com/articles/s41377-021-00509-6#Abs1
[6] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44YIkyQVDIVOGy9EypeelMAgAAAEo&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
[7] https://whitepapers.theregister.com/
Very cool.
Dr_N
But no mention of sharks?
Re: Very cool.
Neil Barnes
It's always important to be able to prove the origins of your beans beans.
Real science!
Mike 137
" Our finding was lucky because we weren't looking for it. "
That's how real science happens. I was present when a team of smart post-docs discovered the optical gyroscope in 1987. They didn't know it was an optical gyroscope then - just that a laser beam travelling in a coil of optical fibre was affected by magnetic fields.
It's really great that serendipity is still alive in today's increasingly regimented grant-driven science institutions.
Nice work
Nice work, it brings back memories from my PhD days–different materials similar applications. At a quick glance it does look as though the system looked at could be useful for ultrafast optical switching and/or optical computing. It will interesting to see if/how this develops.
Minor niggle on the reporting: it is not apathy that has prevented the production of silicon lasers, LEDs etc. Rather it is the laws of physics – insert Star Trek quote here...–Silicon is an indirect band gap material and it will always be terrible (effectively useless) at emitting light.