Step towards ‘holy grail’ of silicon photonics
A group of researchers from the UK, including Dr Ian Ross from our Department of Electronic and Electrical Engineering, have demonstrated the first practical laser that has been grown directly on a silicon substrate.
The creation of this first practical silicon-based laser has the potential to transform communications, healthcare and energy systems.
It is believed the breakthrough could lead to ultra-fast communication between computer chips and electronic systems and therefore transform a wide variety of sectors, from communications and healthcare to energy generation.
The EPSRC-funded UK group, led by Cardiff University and including researchers from the University of Sheffield and UCL, presented their findings in the journal, Nature Photonics.
Silicon is the most widely used material for the fabrication of electronic devices and is used to fabricate semiconductors, which are embedded into nearly every device and piece of technology that we use in our everyday lives, from smartphones and computers to satellite communications and GPS.
Electronic devices have continued to get quicker, more efficient and more complex, and have therefore placed an added demand on the underlining technology.
Researchers have found it increasingly difficult to meet these demands using conventional electrical interconnects between computer chips and systems, and have therefore turned to light as a potential ultra-fast connector.
Whilst it has been difficult to combine a semiconductor laser – the ideal source of light – with silicon, the UK group have now overcome these difficulties and successfully integrated a laser directly grown onto a silicon substrate for the very first time.
Professor Huiyun Liu, who led the growth activity, explained that the 1300 nm wavelength laser has been shown to operate at temperatures of up to 120°C and for up to 100,000 hours.
Professor Peter Smowton, from the School of Physics and Astronomy, said: “Realising electrically-pumped lasers based on Si substrates is a fundamental step towards silicon photonics.
“The precise outcomes of such a step are impossible to predict in their entirety, but it will clearly transform computing and the digital economy, revolutionise healthcare through patient monitoring, and provide a step-change in energy efficiency.”