Breakthrough Flexible Te/PET Films Enable High-Performance Ultrafast All-Optical Terahertz Modulators for Wearables

A collaborative research team from Capital Normal University and the Chinese Academy of Sciences has developed a pioneering, flexible terahertz modulator utilizing tellurium (Te) nanofilms on polyethylene terephthalate (PET) substrates. This innovative device addresses the persistent challenge of signal loss in flexible photonics by combining the inherent mechanical robustness of Te nanofilms with the flexibility of PET. The resulting platform delivers exceptional performance, characterized by high modulation efficiency, low insertion loss, and a rapid picosecond photoresponse.

Crucially, the Te/PET films maintain consistent operational integrity even under significant mechanical deformation. Experimental testing demonstrated that the device retains a stable transient terahertz photoresponse during repeated bending cycles and at tight radii. This mechanical durability is a significant leap forward for flexible electronics, ensuring that devices remain functional and reliable in dynamic, real-world environments where structural stress is common.

By integrating these modulators into artificial neural networks, researchers successfully achieved stable image recognition regardless of the device's physical state. This milestone confirms that the technology is ready to serve as a foundational component for next-generation intelligent sensing, wearable optoelectronics, and advanced communication systems. These findings provide a scalable and effective strategy for developing durable, high-speed terahertz functional units capable of operating in complex, flexible, and wearable applications.