A multifunctional skin-like wearable optical sensor based on an optical micro-/nanofibre

Area of Science:

• Bioelectronics
• Materials Science
• Wearable Technology

Background:

• Skin-like sensors are crucial for advanced healthcare and robotics.
• Existing sensors often lack the flexibility and compatibility required for seamless integration with the human body.

Purpose of the Study:

• To develop a novel skin-like wearable optical sensor (SLWOS).
• To demonstrate its capabilities in monitoring strain, bending, and temperature.
• To highlight its potential in next-generation bioelectronic applications.

Main Methods:

• Fabrication of a stretchable, flexible patch embedded with an optical micro-/nanofibre (MNF).
• Utilizing the transition from radiation to guided modes in the MNF for strain sensing.
• Leveraging the thermo-optic properties of PDMS for temperature sensing.

Main Results:

• Achieved high sensitivity to weak strain (gauge factor of 675 at <1% strain).
• Demonstrated monitoring of bending angle over a broad dynamic range with tunable sensitivity.
• Enabled accurate temperature measurements from -20 to 130 °C.
• Successfully monitored respiration, arm motion, and body temperature in real-time.

Conclusions:

• The developed SLWOS offers superior sensing performance and mechanical flexibility.
• This technology holds significant potential for ultrasensitive wearable devices and photonic healthcare.
• The SLWOS is highly compatible with skin, curved surfaces, and clothing.