Influence of the Sub-peak of Secondary Surface Plasmon Resonance onto the Sensing Performance of a D-shaped Photonic Crystal Fibre Sensor

Abstract Nowadays, plasmonic sensor based on photonic crystal fiber (PCF) attracted a great deal of attention in field of optical sensing. An opening up dual-core photonic crystal fiber based on surface plasmon resonance (SPR) are numerically demonstrated and analyzed for detecting wide refractive index (RI) range by Finite-Difference Time-Domain method (FDTD). The wavelength and amplitude integration methods, as well as figure of merit are used to investigate the sensor performance. For improving sensing performance, it is introduced a large hole between two cores in opening up section. The opening up section as a sensing channel is coated with gold film and a thin titanium dioxide (\({TiO}_{2}\)) layer. By surface engineering including imposing of grating on the gold film, specification of optimized values of different layers located near the surface, sensing performance are investigated. Next, the effect of the fiber structural parameters is analyzed to enhancing of SPR and fundamental core mode coupling. The proposed sensor revealed maximum wavelength and amplitude sensitivities of 15167 \(\left(\frac{nm}{RIU}\right)\) and 207.19 \(\left({RIU}^{-1}\right)\), respectively. Due to ease of infiltering analyte and gold coating and tanks to high wavelength and amplitude sensitivity, the sensors can be promising candidate of physical and chemical sensing.

Download Full-text

Surface Plasmon Resonance-Based Temperature Sensor with Outer Surface Metal Coating on Multi-Core Photonic Crystal Fibre

Surfaces ◽

10.3390/surfaces3030025 ◽

2020 ◽

Vol 3 (3) ◽

pp. 337-351

Author(s):

Samuel Osifeso ◽

Suoda Chu ◽

Ashwini Prasad ◽

K. Nakkeeran

Keyword(s):

Surface Plasmon Resonance ◽

Photonic Crystal ◽

Surface Plasmon ◽

Outer Surface ◽

Plasmon Resonance ◽

Temperature Sensor ◽

Metal Coating ◽

Temperature Sensitive ◽

Photonic Crystal Fibre ◽

Surface Metal

We report an innovative design of a multi-core photonic crystal fibre-based surface plasmon resonance temperature sensor using ethanol and benzene as temperature-sensitive materials with a segmented outer-surface metal coating scheme. A stable sensing performance for a detection range of 10–80 ∘ C was found while using ethanol as the temperature-sensitive material; while using benzene both blue and red frequency shifts were observed. The maximum temperature sensitivities obtained from this proposed temperature sensor were 360 pm/ ∘ C and 23.3 nm/ ∘ C with resolutions of 2.78 × 10 − 1 ∘ C and 4.29 × 10 − 3 ∘ C, respectively, when using ethanol or benzene as the sensing medium.

Download Full-text

Statistical Modelling of Photonic Crystal Fibre Based Surface Plasmon Resonance Sensors Resonant Peak Wavelength for Tolerance Studies

Sensors ◽

10.3390/s21196603 ◽

2021 ◽

Vol 21 (19) ◽

pp. 6603

Author(s):

Samuel Osifeso ◽

Suoda Chu ◽

K. Nakkeeran

Keyword(s):

Surface Plasmon Resonance ◽

Photonic Crystal ◽

Surface Plasmon ◽

Structural Parameters ◽

Resonant Peak ◽

Peak Wavelength ◽

Core Diameter ◽

Photonic Crystal Fibre ◽

Gold Layer Thickness ◽

Sensing Performance

We report a statistical approach to model the resonant peak wavelength (RPW) equation(s) of a photonic crystal fibre (PCF)-based surface plasmon resonance (SPR) sensors in terms of the PCF structural parameters (air-hole diameter, pitch, core diameter and gold layer thickness) at various tolerance levels. Design of experiments (statistical tool) is used to investigate the role played by the PCF structural parameters for sensing performance evaluation—RPW, across three tolerance levels (±2%, ±5% and ±10%). Pitch of the hollow-core PCF was discovered to be the major influencing parameter for the sensing performance (RPW) of the PCF-based SPR sensor while the inner metal (gold) layer thickness and core diameter are the least contributing parameters. This novel statistical method to derive the sensing performance parameter(s) of the PCF-based SPR sensors can be applied effectively and efficiently in the designing, characterisation, tolerance analysis not only at the research level, but also in optical fibre sensor fabrication industry to improve efficiency and lower cost.

Download Full-text