Optical Refractive Index Sensors with Plasmonic and Photonic Structures: Promising and Inconvenient Truth

This study is intended to develop long period fibre grating sensors for potential applications in environmental and durability monitoring of coastal structures. High-quality helical long period fibre gratings (HLPFGs) are inscribed in different types of small-core single mode fibre (SMF) by use of hydrogen-oxygen flame heating technique. A detailed investigation of the effect of core diameter on their transmission spectrum and optimum length of the HLPFG has been pursued. A longer length is required to achieve the same coupling attenuation in a smaller-core SMF than that of a larger-core fibre. The strain, torsion and refractive index (RI) properties of the HLPFG is investigated experimentally to develop a high-sensitivity sensor. The experimental results show that the strain sensitivity could be enhanced by means of employing a larger-core diameter SMF. Moreover, the HLFPGs are also sensitive to the torsion and external RI. Hence, such HLFPGs have great potential for sensing applications.

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Overview of refractive index sensors comprising photonic crystal fibers based on the surface plasmon resonance effect [Invited]

Chinese Optics Letters ◽

10.3788/col202119.102202 ◽

2021 ◽

Vol 19 (10) ◽

pp. 102202

Author(s):

Chao Liu ◽

Jingwei Lü ◽

Wei Liu ◽

Famei Wang ◽

Paul K. Chu

Keyword(s):

Refractive Index ◽

Surface Plasmon Resonance ◽

Photonic Crystal ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Photonic Crystal Fibers ◽

Resonance Effect ◽

Surface Plasmon Resonance Effect ◽

Refractive Index Sensors ◽

Crystal Fibers

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High contrast and sensitive near-infrared refractive index sensors based on metal-dielectric-metal plasmonic metasurfaces

Physica B Condensed Matter ◽

10.1016/j.physb.2021.413469 ◽

2021 ◽

pp. 413469

Author(s):

Thu Trang Hoang ◽

Thanh Son Pham ◽

Xuan Bach Nguyen ◽

Huu Tu Nguyen ◽

Khai Q. Le ◽

...

Keyword(s):

Refractive Index ◽

Near Infrared ◽

High Contrast ◽

Refractive Index Sensors

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High-sensitivity refractive index sensors based on Fano resonance in the plasmonic system of splitting ring cavity-coupled MIM waveguide with tooth cavity

Applied Physics A ◽

10.1007/s00339-018-2283-0 ◽

2018 ◽

Vol 125 (1) ◽

Cited By ~ 21

Author(s):

Yanjun Zhang ◽

Yiqin Kuang ◽

Zhidong Zhang ◽

Yue Tang ◽

Jianqiang Han ◽

...

Keyword(s):

Refractive Index ◽

Fano Resonance ◽

Ring Cavity ◽

High Sensitivity ◽

Refractive Index Sensors ◽

Mim Waveguide

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Extraordinarily high spectral sensitivity in refractive index sensors using multiple optical modes

Optics Express ◽

10.1364/oe.19.010029 ◽

2011 ◽

Vol 19 (11) ◽

pp. 10029 ◽

Cited By ~ 52

Author(s):

Zongfu Yu ◽

Shanhui Fan

Keyword(s):

Refractive Index ◽

Spectral Sensitivity ◽

Optical Modes ◽

Refractive Index Sensors

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Refractive index evaluation of porous silicon using Bragg reflectors

Revista Mexicana de Física ◽

10.31349/revmexfis.64.72 ◽

2018 ◽

Vol 64 (1) ◽

pp. 72 ◽

Cited By ~ 4

Author(s):

D. Estrada-Wiese ◽

J.A. Del Río

Keyword(s):

Refractive Index ◽

Porous Silicon ◽

Simple Procedure ◽

Merit Function ◽

Refractive Indices ◽

Bragg Reflectors ◽

Photonic Bandgaps ◽

Photonic Structures ◽

Index Evaluation

There are two main physical properties needed to fabricate 1D photonic structures and form perfect photonic bandgaps: the quality of thethickness periodicity and the refractive index of their components. Porous silicon (PS) is a nano-structured material widely used to prepare 1Dphotonic crystals due to the ease of tuning its porosity and its refractive index by changing the fabrication conditions. Since the morphologyof PS changes with porosity, the determination of PS’s refractive index is no easy task. To find the optical properties of PS we can usedifferent effective medium approximations (EMA). In this work we propose a method to evaluate the performance of the refractive index ofPS layers to build photonic Bragg reflectors. Through a quality factor we measure the agreement between theory and experiment and thereinpropose a simple procedure to determine the usability of the refractive indices. We test the obtained refractive indices in more complicatedstructures, such as a broadband Vis-NIR mirror, and by means of a Merit function we find a good agreement between theory and experiment.With this study we have proposed quantitative parameters to evaluate the refractive index for PS Bragg reflectors. This procedure could havean impact on the design and fabrication of 1D photonic structures for different applications.

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