Cambridge $10 Sensor Detects Blood Glucose

On Oct. 22, 2026, Cambridge scientists announced a $10 optical sensor that could fit on a wrist. The device, built on a silicon-nitride photonic platform, uses a convolution theorem to analyze light directly. It measures across 1200-1700 nm and delivers 100% classification accuracy on plastics, drugs, coffee, flour, and tea. Concentration measurements in water and organic solutions reached 0.01% precision, beating commercial benchtop spectrometers. In a human study, the chip tracked blood glucose noninvasively over time, a first for wrist-sized devices. The sensor remains accurate from -20°C to 80°C, showing robust performance in extreme environments. Dr. Chunhui Yao said using convolution directly in the optical domain removes limits of miniaturized spectrometers. Prof. Qixiang Cheng noted the chip's readiness and temperature tolerance open doors to practical medical use. GlitterinTech, a start-up from the same group, plans to commercialize the sensor for food safety, quality control, and environmental monitoring. If adopted, this $10 chip could bring lab-level precision to everyday wearables, eliminating needles for glucose tracking.