First spin photon receiver for AI data links

TDK has made a significant breakthrough in the field of data transfer with the development of a photo-spintronic conversion element that integrates optical, electronic, and magnetic components. This innovative spin photon detector boasts a remarkable response time of 20 picoseconds when exposed to 800nm light, surpassing traditional semiconductor-based photo detectors by more than tenfold. The enhanced speed of photoelectric conversion is poised to revolutionize data transmission and processing in artificial intelligence applications, offering not only faster performance but also reduced power consumption.

Building upon its successful CoFeB magnetic tunnel junction (MTJ) technology, which is widely utilized in billions of HDD heads, TDK has adapted this technology for photonics applications. A key advantage of this approach is its independence from crystal growth on a single crystal substrate, enabling the device to be constructed on various substrate materials. This versatility opens up possibilities for seamless integration into AI accelerator chips and chiplets, particularly for co-packaged optics (CPO) configurations.

• Nvidia looks to silicon photonics to cut datacentre power
• 3D photonic chip delivers record 116Tbit/s speed

The Spin Photo Detector operates on a fundamentally different principle, leveraging an electron heating phenomenon to achieve ultra-high speeds even at a reduced wavelength of 800nm. Furthermore, it offers a broader operating wavelength range compared to silicon converters, demonstrating functionality across visible light to near-infrared light spectrums in collaborative testing with Nihon University in Japan.

Aside from its applications in AI technology, the detector holds promise for diverse uses such as in augmented reality/virtual reality smart glasses, high-speed image sensors, and aerospace systems due to its robust resistance to cosmic rays. This versatility underscores the potential for the spin photon detector to drive innovation across multiple industries, paving the way for advanced technological solutions.