Femtosecond laser direct writing annular small-period long-period fiber gratings for simultaneous refractive index and temperature sensing

被引：0
|
作者：
Liu, Yulei [1 ]
Cai, Jintao [1 ]
Liu, Hanyuan [1 ]
Shu, Xuewen [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
来源：
OPTICS LETTERS | 2024年 / 49卷 / 15期
基金：
中国国家自然科学基金;
关键词：
BRAGG GRATINGS; SENSITIVITY; SENSOR;
D O I：
10.1364/OL.532484
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A new type of small-period long-period fiber grating (SPLPFG) consisting of a series of annuli inscribed by a femtosecond laser in a single-mode fiber is proposed and demonstrated. The effects of the annuli radii and the number of annuli in each period on the transmission spectrum are studied. The transmission spectrum of the annular SP-LPFG exhibits both strong Bragg resonances and cladding mode resonances, which have similar temperature sensitivities of 9.26 and 9.75 pm/degrees C, respectively. The Bragg resonances are insensitive to the change of environment refractive index (RI), while the cladding mode resonances show a RI sensitivity of 141.89 nm/RIU. The proposed sensor offers a potential solution for biomolecular sensing applications by effectively eliminating the issue of temperature cross-sensitivity. Its compact design and ease of spectral acquisition enhance its practicality and convenience. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
引用
收藏
页码：4194 / 4197
页数：4
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