High-sensitivity temperature sensor based on a compact etched assembled LPFG in a SiO 2 -PDMS hybrid waveguide
Abstract
In this Letter, we propose an ultra-sensitive, compact temperature sensor based on an etched assembled long-period fiber grating (EA-LPFG) redefined by a SiO 2 -PDMS hybrid waveguide. This structure is fabricated by periodically splicing SMF and NCF segments, with the entire fiber skeleton subsequently etched to 30 µm to trigger a full-interface evanescent leakage regime in PDMS for enhancing the temperature sensitivity. Experimental results show that the structure achieves the temperature sensitivity of −1.00 nm/°C within a compact sensing length of only 2.6 mm. This work not only provides a high-performance tool for temperature sensing but also offers insights into the modal evolution of hybrid-waveguide-based photonic devices.
Fields of Study & Subjects
Advanced Fiber Optic Sensors
Mechanical and Optical Resonators
Photonic and Optical Devices
Publication details
- Journal / source
- Optics Letters
- Publisher
- Optica Publishing Group
- Volume
- 51
- Issue
- 14
- Pages
- 3973–3973
- Publication date
- 24 June 2026
- Language
- EN