Author Affiliations
Abstract
1 Department of Electrical, Electronic and Communications Engineering, Public University of Navarre, Pamplona 31006, Spain
2 Institute of Smart Cities, Public University of Navarre, Pamplona 31006, Spain
3 Department of Electronics, Carleton University, Ottawa (Ontario) K1S 5B6, Canada
Multiple mode resonance shifts in tilted fiber Bragg gratings (TFBGs) are used to simultaneously measure the thickness and the refractive index of TiO2 thin films formed by Atomic Layer Deposition (ALD) on optical fibers. This is achieved by comparing the experimental wavelength shifts of 8 TFBG resonances during the deposition process with simulated shifts from a range of thicknesses (T) and values of the real part of the refractive index (n). The minimization of an error function computed for each (n, T) pair then provides a solution for the thickness and refractive index of the deposited film and, a posteriori, to verify the deposition rate throughout the process from the time evolution of the wavelength shift data. Validations of the results were carried out with a conventional ellipsometer on flat witness samples deposited simultaneously with the fiber and with scanning electron measurements on cut pieces of the fiber itself. The final values obtained by the TFBG (n = 2.25, final thickness of 185 nm) were both within 4% of the validation measurements. This approach provides a method to measure the formation of nanoscale dielectric coatings on fibers in situ for applications that require precise thicknesses and refractive indices, such as the optical fiber sensor field. Furthermore, the TFBG can also be used as a process monitor for deposition on other substrates for deposition methods that produce uniform coatings on dissimilar shaped substrates, such as ALD.
tilted fiber Bragg grating (TFBG) mode transition ellipsometer Opto-Electronic Advances
2023, 6(10): 230048
Author Affiliations
Abstract
1 School of Control Science and Engineering, Shandong University, Jinan, 250061, China
2 State Key Lab of Microbial Technology, School of Life Science, Shandong University, Jinan, 250100, China
3 School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
A method for detecting protein molecules based on the tilted fiber Bragg grating (TFBG) surface plasma resonance (SPR) is proposed to achieve the quick online real-time detection of trace amount of proteins. The detection principles of the TFBG-SPR protein molecular probe are analyzed, and its feasibility is demonstrated. The intermediary material between the protein molecules and the golden layer outside of the fiber gratings is cysteamine hydrochloride. When the concentration of the cysteamine hydrochloride solution is 2 M, the shift of the TFBG resonance peak is 2.23 nm, illustrating that the cysteamine hydrochloride modifies the gold film successfully. IgG antigen solution is poured on the surface of the cysteamine hydrochloride modifying the gold-deposited TFBG. Finally, antigen-antibody hybridization experiment is carried out with a 10 mg/mL antibody solution, and after two hours of hybridization the resonance peak of the TFBG shifts 5.1 nm, which validates the feasibility and effectiveness of the TFBG-SPR protein molecular probe.
Surface plasma resonance TFBG protein molecular probe Photonic Sensors
2017, 7(4): 317
利用OptiGrating软件研究了TFBG(倾斜光纤光栅)在环境折射率变化极其微小的情况下不同模式的光谱特性。结果表明, 微小环境折射率的变化对纤芯模与幻影模的影响甚微, 却对包层模影响较大。由于变化极小, 包层模谐振波长的漂移可以忽略, 只需考虑谐振峰深度的变化。发现波长在1 542 nm附近的高阶包层模对环境折射率高度敏感, 并且在一定的范围内灵敏度极高, 最高可达10-5 量级, 在高精度折射率传感领域前景广阔。
倾斜光纤光栅 环境折射率 高阶包层模 高精度折射率传感 TFBG surrounding refractive index higher-order cladding mode high precision refractive index sensing
Author Affiliations
Abstract
1 School of Control Science and Engineering, Shandong University, Jinan, 250061, China
2 State Key Lab of Microbial Technology, School of Life Science, Shandong University, Jinan, 250100, China
This paper reports the application of the biomolecular probe sensor based on the tilted fiber Bragg grating (TFBG) surface plasma resonance (SPR) which can recognize the specificity of the specific molecule by depositing sensitive biological membrane outside the active golden layer. The method of self-assembly was used to make the fixed sensitive biological membrane to achieve the best effect in the experiment. To illustrate the specific recognition of the DNA molecule, the TFBG-SPR biosensor was exposed to complementary DNA solutions with the concentration of 0.1 mmol/L and 0.05 mmol/L, respectively. The resonance wavelength of the TFBG-SPR biosensor increased gradually, indicating that the hybridization with the complementary DNA molecules changed the effective refractive index in the vicinity of the golden layer. Furthermore, the results illustrated the feasibility of the biomolecular probe sensor based on the TFBG surface plasma resonance for detecting the specific molecule.
TFBG nanostructure golden layer surface plasma resonance biosensor Photonic Sensors
2015, 5(2): 102
东北石油大学 电子科学学院,黑龙江 大庆163318
倾斜光纤光栅作为一种特殊结构的光纤光栅,近年来受到了研究人员的广泛关注。基于模式耦合理论,仿真研究了光栅周期对倾斜光纤光栅透射谱的影响规律。研究结果表明,纤芯导模与包层模的波长差和光栅周期之间存在良好的线性关系。利用这一结论可提高倾斜光纤光栅在应变测量中的灵敏度和检测精度,且能够实现单光纤多测量的目的。
倾斜光纤光栅(TFBG) 透射谱 周期 理论仿真 tilted fiber Bragg grating(TFBG) transmission spectrum period theory simulation
Author Affiliations
Abstract
Key Lab of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, 611731, China
Tilted fiber Bragg grating (TFBG) and reflective tilted fiber Bragg grating (R-TFBG) were proposed and demonstrated in the graded-index multimode fiber (GI-MMF). The TFBGs with grating planes tilted at an angle of 2.5° corresponding to the fiber axis were inscribed. The TFBGs in the GI-MMF had the good linear sensitivity to the temperature, strain and curvature. The fiber was then cleaved at the far end of the TFBG to form an R-TFBG using the Fresnel reflection of the fiber end. The reflective spectra of the R-TFBG were given, and the temperature sensing properties were also investigated.
TFBG GI-MMF sensor Photonic Sensors
2013, 3(2): 112
1 广西师范大学 a.电子工程学院
2 河南理工大学 计算机学院,河南 焦作454000
3 广西师范大学 b. 物理科学与技术学院, 广西 桂林 541004
基于倾斜光纤光栅耦合模理论，采用数值分析法研究了前后向导模耦合时倾斜角度和调制深度对倾斜光纤光栅反射谱的影响，以及导模和辐射模耦合时针对不同的入射光偏振态在倾斜角度、调制深度、光栅长度等不同时倾斜光纤光栅透射谱(或反射谱)的特性.研究结果表明，在前后向导模耦合时，不同偏振态入射光的光谱几乎相同；而对于辐射模耦合，由于反射谱的包络受消光系数的调制，而不同偏振态入射光的消光系数不同，并且倾斜角度越大不同偏振态的入射光的消光系数差别越大，故在研究辐射模耦合时需要将偏振态予以考虑.
倾斜光纤光栅 Bragg散射 辐射模 偏振 Tilted Fiber Bragg Grating(TFBG) Bragg scattering Radiation Polarization
Author Affiliations
Abstract
1 Key Laboratory of Opto-Electronic Information and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin, 300071, China
2 Tianjin Key Laboratory of Film Electronic and Communication Device, School of Electronics Information Engineering, Tianjin University of Technology, Tianjin, 300384, China
In this paper, the mode coupling mechanism of tilted fiber Bragg gratings (TFBGs) is briefly introduced at first. And a general review on the fabrication, theoretical and experimental research development of TFBGs is presented from a worldwide perspective, followed by an introduction of our current research work on TFBGs at the Institute of Modern Optics, Nankai University (IMONK), including TFBG sensors for single-parameter measurements, temperature cross sensitivity of TFBG sensors, and TFBG-based interrogation technique. Finally, we would make a summary of the related key techniques and a remark on prospects of the research and applications of TFBGs.
Fiber sensor tilted fiber Bragg grating (TFBG) mode coupling temperature cross sensitivity biochemical sensing interrogation Photonic Sensors
2011, 1(1): 6
中国科学院上海光学精密机械研究所, 上海 201800
反射谱具有三角形形状的光纤光栅在光纤传感等领域中具有重要的应用前景。利用遗传算法设计出了产生三角形光谱分布的光纤光栅的耦合系数沿光纤的分布。计算表明,三角形光谱光纤光栅是可以实现的,其反射带宽可以通过光栅的啁啾量进行调节,常周期的三角光栅反射带宽小,变周期的三角光栅反射带宽大,其带宽同其啁啾量大致相等。实验中,采用光束扫描法制备了反射底宽为0.77 nm三角形光谱的光纤光栅。
导波与光纤数学 三角形光谱 光纤光栅 遗传算法 反射带宽
