Temperature-insensitive refractive index sensor based on high-order-resonance short-line long-period fiber grating

Bu, Wenyi1; Wang, Xicheng1,2; Wu, Zhifang1; Lin, Jing1; Shum, Perry Ping3; Pu, Jixiong1

2023-10-01

10.1016/j.sna.2023.114540

SENSORS AND ACTUATORS A-PHYSICAL   影响因子和分区

0924-4247

1873-3069

Long-period fiber grating based refractometers have attracted great attention for various applications, but they usually suffer from the cross sensitivity to temperature in practice. Here, we demonstrate a temperature-insensitive refractive index sensor based on a short-line long-period fiber grating (SL-LPFG). It is fabricated by using femtosecond laser to periodically inscribe short lines in a standard single-mode fiber (SMF) with a small duty cycle of 0.3, and resonates to a cladding mode with a high diffraction order. This high-order-resonance SL-LPFG responds to ambient refractive index with the sensitivities of 175.84 nm/RIU and 367.63 nm/RIU in the ranges of 1.3381 to 1.3763 and 1.3763 to 1.4008, respectively. Meanwhile, it presents a temperature sensitivity as low as 4.0 pm/celcius, which is almost one percent of the temperature sensitivity of the similar period LPFG fabricated by UV exposure method. It is significant for LPFG-based refractometers in normal SMFs to minimize thermal interference without the assistance of an additional sensing unit and matrix interrogation. Therefore, the proposed high-order-resonance SL-LPFG provides a high-performance and low-cost solution for refractive index related applications, especially in medical, chemical, and biological fields.

Refractive index sensor Short-line long-period fiber grating High-order resonance Temperature insensitivity Femtosecond laser micromachining

SCI ; EI

英语

其他

National Natural Science Foundation of China[ZQN-YX504] ; null[11774102]

Engineering ; Instruments & Instrumentation

Engineering, Electrical & Electronic ; Instruments & Instrumentation

WOS:001056513500001

ELSEVIER SCIENCE SA

20232914400020

Diffraction gratings ; Femtosecond lasers ; Refractive index ; Single mode fibers

Light/Optics:741.1 ; Fiber Optics:741.1.2 ; Optical Devices and Systems:741.3 ; Lasers, General:744.1 ; Optical Instruments:941.3

ENGINEERING

Web of Science

1.Huaqiao Univ, Coll Informat Sci & Engn, Fujian Key Lab Light Propagat & Transformat, Xiamen 361021, Peoples R China
2.Jinan Univ, Inst Photon Technol, Guangzhou 510632, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Bu, Wenyi,Wang, Xicheng,Wu, Zhifang,et al. Temperature-insensitive refractive index sensor based on high-order-resonance short-line long-period fiber grating[J]. SENSORS AND ACTUATORS A-PHYSICAL,2023,360.

Bu, Wenyi,Wang, Xicheng,Wu, Zhifang,Lin, Jing,Shum, Perry Ping,&Pu, Jixiong.(2023).Temperature-insensitive refractive index sensor based on high-order-resonance short-line long-period fiber grating.SENSORS AND ACTUATORS A-PHYSICAL,360.

Bu, Wenyi,et al."Temperature-insensitive refractive index sensor based on high-order-resonance short-line long-period fiber grating".SENSORS AND ACTUATORS A-PHYSICAL 360(2023).