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Terahertz waves have been an exciting area of research in the past few years because they can be used to examine the internal structures of objects without the risks associated with X-rays. Now one research team has used the tiny waves to peer into the inner workings of transistors while they’re operating, and is exploring whether the technique could be used to read any data stored in a chip.
As reported by IEEE Spectrum (via Tom’s Hardware), the multinational research group (comprising engineers from universities in Australia, Germany, and the USA) studied the behaviour of ‘packaged semiconductor devices’ in the low/sub-terahertz part of the electromagnetic spectrum. This is roughly in the boundary where microwaves and infrared waves overlap, in terms of wavelength.
Research lead Withawat Withayachumnankul, professor of engineering at Adelaide University, explained to IEEE Spectrum that the work, once developed further and refined, could be useful for checking the operation of electronic components that need to stay working, e.g. in power delivery systems, where you don’t want to shut things down.
The report also notes that the professor is “aiming to use the technique to read encrypted data in chips, which could have implications for security.” However, before your alarm bells go a-clanging, it’s worth noting that terahertz waves can only penetrate non-metallic materials, so any processor or chip covered by a heatspreader/heatsink is pretty much safe.
And even for those devices that are only covered by a plastic or organic package, the multi-layer nature of today’s chips, typically stuffed with lots of copper interconnects, poses a natural barrier to terahertz investigation. But if there’s one thing researchers love, it’s a challenge that seems impossible to get around, and I wouldn’t be surprised if the next time I’m writing about terahertz waves, engineers have come up with a totally novel solution.
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