scholarly journals High Sensitivity Refractive Index Sensor by D-Shaped Fibers and Titanium Dioxide Nanofilm

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Chuen-Lin Tien ◽  
Hong-Yi Lin ◽  
Shu-Hui Su
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Titanium Dioxide ◽  
Optical Spectrum ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Fiber Sensing ◽  
Nanosized Titanium Dioxide ◽  
Residual Thickness ◽  
Shaped Fibers

This paper presents a high sensitivity liquid refractive index (RI) sensor based on lossy mode resonance (LMR) effect. The D-shaped fibers coated with nanosized titanium dioxide (TiO2) thin film as a sensing head were submerged into different refractive index solutions. The variations in the optical spectrum of the proposed RI sensor with different refractive index solutions were measured. The LMR resonance peaks were used to determine the wavelength shifts with different refractive index solutions. The results show that the optical spectrum peaks shifted towards the longer wavelength side with increasing the refractive index. For the proposed fiber sensing head with a polishing residual thickness of 72 μm, the maximum shift of the absorption peak was 264 nm. The sensitivity of the proposed RI sensor was 4122 nm/RIU for the refractive index range from 1.333 to 1.398.

Surface refractive index sensor based on titanium dioxide composite thin film for detection of cadmium ions

Measurement ◽  
2021 ◽  
pp. 110287
Author(s):  
Nur Alia Sheh Omar ◽  
Ramli Irmawati ◽  
Yap Wing Fen ◽  
Ernee Noryana Muhamad ◽  
Faten Bashar Kamal Eddin ◽  
...  
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Titanium Dioxide ◽  
Composite Thin Film ◽  
Refractive Index Sensor ◽  
Cadmium Ions

scholarly journals Highly sensitive refractive index sensor based on SPR with silver and titanium dioxide coating

2021 ◽  
Author(s):  
haiming yang ◽  
Guangyao Wang ◽  
Ying Lu ◽  
Jianquan Yao
Keyword(s):  
Refractive Index ◽  
Titanium Dioxide ◽  
Near Infrared ◽  
High Sensitivity ◽  
Organic Chemical ◽  
Refractive Index Sensor ◽  
Geometrical Parameters ◽  
Crystal Fiber ◽  
Wavelength Sensitivity ◽  
Highly Sensitive

Abstract A surface plasmon resonance (SPR) sensor based on dual-layered air hole shaped photonic crystal fiber (PCF) is proposed to realize the simultaneous measurement of refractive index (RI). The plasma materials silver (Ag) and titanium dioxide (TiO2) were sequentially coated on the outer surface of PCF to obtain enhanced sensing properties. By carefully adjusting the geometrical parameters, the simulation results show a maximum wavelength sensitivity of 72000 nm/RIU for analyte refractive indices ranging from 1.26 to 1.365, which realizes the high-sensitivity sensing in the visible to near-infrared optical band. Moreover, the sensor attains a maximum figure of merit (FOM) of 229 and RI resolution of 1.29 × 10− 6. This work shows great potential for real-time, affordable, and accurate measurement in biomedical, biological and organic chemical domains.

High sensitivity refractive index sensor based on micro-fiber with micro-arched transition

2019 ◽  
Vol 50 ◽  
pp. 13-18 ◽  
Author(s):  
Zengshan Xing ◽  
Yanzhen Wang ◽  
Li Tang ◽  
Jianhui Yu ◽  
Heyuan Guan ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Refractive Index Sensor

scholarly journals Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1028
Author(s):  
Na Zhao ◽  
Qijing Lin ◽  
Kun Yao ◽  
Fuzheng Zhang ◽  
Bian Tian ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Temperature ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Temperature Response ◽  
High Sensitivity ◽  
Xrd Analysis ◽  
Refractive Index Sensor ◽  
Compact Structure ◽  
Fluid Analysis

The optical fiber temperature and refractive index sensor combined with the hollow needle structure for medical treatment can promote the standardization of traditional acupuncture techniques and improve the accuracy of body fluid analysis. A double-parameter sensor based on fiber Bragg grating (FBG) is developed in this paper. The sensor materials are selected through X-ray diffraction (XRD) analysis, and the sensor sensing principle is theoretically analyzed and simulated. Through femtosecond laser writing pure silica fiber, a high temperature resistant wavelength type FBG temperature sensor is obtained, and the FBG is corroded by hydrofluoric acid (HF) to realize a high-sensitivity intensity-type refractive index sensor. Because the light has dual characteristics of energy and wavelength, the sensor can realize simultaneous dual-parameter sensing. The light from the lead-in optical fiber is transmitted to the sensor and affected by temperature and refractive-index; then, the reflection peak is reflected back to the lead-out fiber by the FBG. The high temperature response and the refractive index response of the sensor were measured in the laboratory, and the high temperature characteristics of the sensor were verified in the accredited institute. It is demonstrated that the proposed sensor can achieve temperature sensing up to 1150 °C with the sensitivity of 0.0134 nm/°C, and refractive sensing over a refractive range of 1.333 to 1.4027 with the sensitivity of −49.044 dBm/RIU. The sensor features the advantages of two-parameter measurement, compact structure, and wide temperature range, and it exhibits great potential in acupuncture treatment.

High sensitivity fiber refractive index sensor using tapered 4-core fiber

2021 ◽  
Author(s):  
Zhen Tian ◽  
Lina Suo ◽  
Nan-Kuang Chen ◽  
Yicun Yao ◽  
Liqiang Zhang ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Core Fiber
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