A low-cost liquid refractive index sensor based on plastic optical fibre and CCD array

Abstract A waveguide coupled surface plasmon sensor for detection of liquid with high refractive index (RI) is designed based on polymer materials. The effects of variation of the thickness of the Au film, polymethyl methacrylate (PMMA) buffer, and waveguide layer on the sensing performance of the waveguide are comprehensively investigated by using the finite difference method. Numerical simulations show that a thinner gold film gives rise to a more sensitive structure, while the variation of the thickness of the PMMA buffer and waveguide layer has a little effect on the sensitivity. For liquid with high RI, the sensitivity of the sensor increases significantly. When RI of liquid to be measured increases from 1.45 to 1.52, the sensitivity is as high as 4518.14nm/RIU, and a high figure of merit of 114.07 is obtained. The waveguide coupled surface plasmon RI sensor shows potential applications in the fields of environment, industry, and agriculture sensing with the merits of compact size, low cost, and high integration density.

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Dual-Core Polymer Optical Fibre Refractive Index Sensor

Photonics and Fiber Technology 2016 (ACOFT, BGPP, NP) ◽

10.1364/acoft.2016.jm6a.4 ◽

2016 ◽

Author(s):

S. Shashidharan ◽

G. E. Town

Keyword(s):

Refractive Index ◽

Optical Fibre ◽

Refractive Index Sensor ◽

Dual Core ◽

Core Polymer

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Monochromatic excitation of surface plasmon resonance in an optical-fibre refractive-index sensor

Sensors and Actuators A Physical ◽

10.1016/s0924-4247(97)80020-9 ◽

1996 ◽

Vol 54 (1-3) ◽

pp. 589-593 ◽

Cited By ~ 51

Author(s):

C Ronot-Trioli ◽

A Trouillet ◽

C Veillas ◽

H Gagnaire

Keyword(s):

Refractive Index ◽

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Optical Fibre ◽

Plasmon Resonance ◽

Refractive Index Sensor

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Graded-lattice AAO photonic crystal heterostructure for high Q refractive index sensing

RSC Advances ◽

10.1039/c5ra15890g ◽

2015 ◽

Vol 5 (88) ◽

pp. 71770-71777 ◽

Cited By ~ 19

Author(s):

Jungmin Lee ◽

Kyuyoung Bae ◽

Gumin Kang ◽

Minjung Choi ◽

Seunghwa Baek ◽

...

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Anodic Aluminum Oxide ◽

Low Cost ◽

Refractive Index Sensor ◽

High Q ◽

Refractive Index Sensing ◽

Anodic Aluminum ◽

Graded Lattice ◽

Photonic Crystal Heterostructure

We present a low-cost and versatile high Q colorimetric refractive index sensor based on anodic aluminum oxide (AAO) graded-lattice photonic crystal heterostructure (PCH) template controlled by voltage pulse and electrolyte temperature.

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Highly Sensitive Plasmonic Refractive Index Sensor Based on Dual D-Shaped Photonic Crystal Fiber with Aluminum Nitride-Silver Films

10.21203/rs.3.rs-1077705/v1 ◽

2021 ◽

Author(s):

Sanfeng Gu ◽

Wei Sun ◽

Meng Li ◽

Ming Deng

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Aluminum Nitride ◽

Photonic Crystal Fiber ◽

Low Cost ◽

Optical Loss ◽

High Sensitivity ◽

Resonance Wavelength ◽

Refractive Index Sensor ◽

Crystal Fiber

Abstract A dual-core and dual D-shaped photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor with silver and Aluminum Nitride (AlN) films is designed. The distribution characteristics of the electromagnetic fields of core and plasmon modes, as well as the sensing properties are numerically studied by finite element method (FEM). The structure parameters of the designed sensor are optimized by the optical loss spectrum. The results show the resonance wavelength variation of 489 nm for the refractive index (RI) range of 1.36~1.42. In addition, a maximum wavelength sensitivity of 13400 nm/RIU with the corresponding RI resolution of 7.46×10-6 RIU is obtained in the RI range of 1.41~1.42. The proposed sensor with the merits of high sensitivity, low cost and simple structure has a wide application in the fields of RI sensing, such as hazardous gas detection, environmental monitoring and biochemical analysis.

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Refractive Index Sensor Based on Twisted Tapered Plastic Optical Fibers

Photonics ◽

10.3390/photonics6020040 ◽

2019 ◽

Vol 6 (2) ◽

pp. 40 ◽

Cited By ~ 9

Author(s):

Teng ◽

Deng ◽

Liu ◽

Yang ◽

Yuan ◽

...

Keyword(s):

Refractive Index ◽

Optical Fibers ◽

Simple Structure ◽

External Medium ◽

Low Cost ◽

The Other ◽

Refractive Index Sensor ◽

Coupling Ratio ◽

Plastic Optical Fibers ◽

Drawing Method

We proposed a refractive index (RI) sensor employing two twisted tapered plastic optical fibers (POFs). The tapered POFs were fabricated by a heating and drawing method and were twisted around each other to form a coupled structure. The sensor consisted of two input ports, a twisted region, and two output ports. The tapered POF could make the light couple from one POF to the other easily. The twisted tapered POFs could constitute a self-referencing sensor, and by monitoring the changes of the coupling ratio, the variations of the external medium RIs could be measured. The RI sensing performances for the sensors with different fiber diameters and twisted region lengths were studied. The sensitivities of 1700%/RIU and −3496%/RIU in the RI ranges of 1.37–1.41 and 1.41–1.44 were obtained, respectively. The sensor is a low-cost solution for liquid RI measurement, which has the features of simple structure and easy fabrication.

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Refractive Index Sensor Based on Double Side-Polished U-Shaped Plastic Optical Fiber

Sensors ◽

10.3390/s20185253 ◽

2020 ◽

Vol 20 (18) ◽

pp. 5253

Author(s):

Shumin Wang ◽

Daming Zhang ◽

Yan Xu ◽

Siwen Sun ◽

Xiaoqiang Sun

Keyword(s):

Refractive Index ◽

Optical Fiber ◽

Evanescent Wave ◽

Low Cost ◽

Temperature Characteristic ◽

Processing Parameters ◽

Refractive Index Sensor ◽

Plastic Optical Fiber ◽

Favorable Temperature ◽

Index Unit

A U-shaped double-side polished plastic optical fiber (POF) is demonstrated as a liquid refractive index (RI) sensor. The refractive index of glycerinum solutions is identified by the intensity detection on the bending and evanescent wave loss change. Heat treatment and mechanical polishing are adopted to form the symmetrical side-polished POF probe. The processing parameters are experimentally optimized on the power transmittance. The sensitivity of 1541%/RIU (Refractive Index Unit) can be obtained with a resolution of 5.35 × 10−4 in the scope of 1.33–1.39. The favorable temperature characteristic is proved to offer stable RI sensing from 20 to 50 °C. This simple POF sensor has potentials in low-cost visible light intensity RI detection.

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