TDK unveiled a new photo-spintronic conversion element, dubbed the “Spin Photo Detector,” capable of responding at speeds of 20 picoseconds using 800 nm wavelength light—making it more than 10 times faster than traditional semiconductor-based photo detectors. The device merges optical, electronic, and magnetic technologies and was successfully demonstrated in collaboration with Nihon University, Japan. It targets next-generation applications in AI, optical interconnects, and low-power, high-speed data transfer systems.
To build the detector, TDK adapted its magnetic tunnel junction (MTJ) technology, widely used in hard disk drive heads, to operate in photonic environments. Unlike traditional photodetectors, which rely on single-crystal substrates, the Spin Photo Detector does not require such materials and can function across a broader wavelength range—from visible to near-infrared. Its unique operating principle, based on electron heating rather than semiconductor bandgap absorption, enables ultra-fast response times and strong resistance to cosmic rays.
The new detector holds promise for a range of emerging technologies, including AR/VR smart glasses, high-speed image sensors, and aerospace systems requiring radiation-tolerant light sensors. TDK aims to continue refining the device’s performance for commercial deployment, with an emphasis on applications where fast photoelectric conversion and energy efficiency are critical.
- Spin Photo Detector achieves 20 picosecond response time using 800 nm light
- Operates 10x faster than conventional semiconductor photodetectors
- Uses magnetic tunnel junction (MTJ) tech; no crystal substrate needed
- Demonstrated with Nihon University, effective from visible to near-infrared light
- Potential use cases: optical interconnects, AI, AR/VR, high-speed sensors, aerospace
- Strong cosmic-ray resistance adds value in space applications
“Our Spin Photo Detector merges spintronics and photonics for a new class of ultra-fast, energy-efficient sensors,” said TDK.
