Ultrasensitive refractive index and temperature sensor based on D-shaped photonic crystal fiber by group birefringence response in a Sagnac interferometer

Zefeng Li, Jinhui Yuan*, Lan Rao, Binbin Yan, Kuiru Wang, Xinzhu Sang, Qiang Wu*, Chongxiu Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper, a D-shaped photonic crystal fiber (PCF) sensor based on a Sagnac interferometer is proposed, and it can achieve ultrahigh refractive index (RI) and temperature sensitivity when operating around the turning point of group birefringence (B g). We undertake a theoretical analysis on B g and a simulation calculation to study the sensing characteristics and obtain the optimized structure parameters of the D-shaped PCF sensor. The simulation results show that the maximum average RI sensitivities can reach 3253.33 and 15500nm/RIU in the RI range of 1.33 to 1.35 and 1.40 to 1.42, respectively. When the temperature changes from -50 to 0 °C and 0 to 50 °C, the maximum average temperature sensitivities are up to 10.11 and 10.67nm/°C, respectively. The proposed D-shaped PCF sensor can achieve dual-parameter sensing and has great potential for practical applications in biochemical and environmental science.
Original languageEnglish
Article number101291
Pages (from-to)1-13
Number of pages13
JournalPhotonics and Nanostructures - Fundamentals and Applications
Early online date24 Jun 2024
Publication statusE-pub ahead of print - 24 Jun 2024

Cite this