Markus Ortsiefer from Vertilas explains why long-wavelength tunable VCSELs are a better option for gas sensing than the lead salt, quantum cascade and diode-pumped solid-state lasers that are used today.
The hybrid III-V/silicon laser manufactured by Intel and its collaborators may not represent true silicon photonics, but it is a significant development in optical interconnects for chip and board communications, discovers Michael Hatcher.
Competition among SiC substrate manufacturers has boosted wafer diameters and eliminated micropipe defects in commercial SiC wafers. However, there is still some division over the effectiveness of the standards used to define the quality of the material, as Richard Stevenson discovers.
A Californian start-up claims that its ultrapure steam generator can boost the production yield and speed the oxide aperture process used widely in VCSEL manufacturing. Richard Stevenson talks to the tool's inventor, Jeff Spiegelman.
The global move towards greater energy-efficiency is one that Cree can tap into from many angles as it looks beyond its traditional territory of blue LEDs. Bob Metzger visited the company's new North Carolina fab to learn more about its latest strategy for growth.
TopGaN's pressure-grown GaN platelet and needle crystals have record-breaking low defect densities, but are limited in size. However, they can be extended by a high growth rate hydride vapor phase epitaxy process that does not compromise on quality, says the company's vice-president Izabella Grzegory.
A US consortium is aiming to smash the solar-cell efficiency record with a radical design that uses a lateral architecture and a dispersive concentrator. If they are successful, soldiers will be freed from a 20 lb load of spare batteries. Richard Stevenson reports.
With the electronic materials division formerly belonging to Emcore now under its wing, IQE is the world's biggest independent supplier of III-V epiwafers to the compound semiconductor industry. Michael Hatcher asks Drew Nelson, the CEO at IQE, about the company's latest move.
Poor current handling and thermal management are suppressing the performance of LEDs for solid-state lighting applications. These problems can be avoided, however, by switching to a low-cost vertical design and a metal alloy substrate, says Trung Doan from SemiLEDs Corporation.
The lack of forward voltage stability in SiC bipolar devices is hampering their deployment in electrical power transformers. However, this problem can be overcome with an etching and regrowth process, say Joe Sumakeris, Brett Hull and Dave Grider from US chip manufacturer Cree.
An equity deal and exclusive supply relationship between UV-LED innovator Sensor Electronic Technology and Korea's leading LED packager will spark a host of new applications by reducing the cost of the devices, writes Michael Hatcher.
Despite distinctly Star Trek undertones, photonic power conversion is a very real technology. More than 10,000 systems are already deployed and a number of promising new applications are in the pipeline, hears Michael Hatcher.
Start-up company MOXtronics has recently produced the first colored ZnO-based LEDs. Although the efficiency of these LEDs is not high, improvements are rapid and the emitters have the potential to outperform their GaN rivals, say Henry White and Yungryel Ryu from MOXtronics.
Aixtron claims that its latest GaN reactor can produce a higher LED chip yield through increased wafer capacity, improved temperature uniformity and greater ease of use. Richard Stevenson investigates.