Asymmetric Dual‐Mode Photonic Fiber for Crosstalk‐Free Thermal‐Tactile Perception

ABSTRACT Smart prosthetic interfaces strongly rely on soft sensing systems capable of multimodal perception and real‐time feedback under complex deformation. Here we report a closed‐loop “sensing‐analysis‐response” prosthetic system integrating stretchable photonic sensors that offer decoupled thermal‐tactile sensitivity and a signal processing back‐end, enabling intuitive feedback through dual‐mode parallel perception. The asymmetric photonic fiber sensor incorporates temperature‐pressure dual‐mode responsive phosphors (CaZnOS/ZnS:Mn 2+ ,Er 3+ ) within a highly stretchable SEBS substrate. The developed sensor exhibits high thermal sensitivity (0.86% K −1 , R 2 = 0.999) and a low pressure detection threshold (<1 N), along with ultrahigh stretchability (∼1000%), minimal bending radius (<1 mm), and strong puncture resistance. When integrated with a compact, low‐power multispectral module, the sensor can be directly used in a skin‐conformal prosthetics interface. It generates a real‐time, sub‐second response, thermal alerts, and machine‐readable feedback. This lightweight‐algorithm‐based, bio‐inspired system provides efficient feedback for the human–machine interface of next‐generation smart prosthetics, laying the groundwork for intelligent and lightweight sensing architectures in human‐integrated photonics.