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An Exposed-Core Grapefruit Fibers Based Surface Plasmon Resonance Sensor.

Yang X, Lu Y, Wang M, Yao J - Sensors (Basel) (2015)

Bottom Line: The asymmetrically coated fiber can support two separate resonance peaks (x- and y-polarized peaks) with orthogonal polarizations and x-polarized peak, providing a much higher peak loss than y-polarized, also the x-polarized peak has higher wavelength and amplitude sensitivities.A large analyte refractive index (RI) range from 1.33 to 1.42 is calculated to investigate the sensing performance of the sensor, and an extremely high wavelength sensitivity of 13,500 nm/refractive index unit (RIU) is obtained.The silver layer thickness, which may affect the sensing performance, is also discussed.

View Article: PubMed Central - PubMed

Affiliation: College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China. yangxianchao@tju.edu.cn.

ABSTRACT
To solve the problem of air hole coating and analyte filling in microstructured optical fiber-based surface plasmon resonance (SPR) sensors, we designed an exposed-core grapefruit fiber (EC-GFs)-based SPR sensor. The exposed section of the EC-GF is coated with a SPR, supporting thin silver film, which can sense the analyte in the external environment. The asymmetrically coated fiber can support two separate resonance peaks (x- and y-polarized peaks) with orthogonal polarizations and x-polarized peak, providing a much higher peak loss than y-polarized, also the x-polarized peak has higher wavelength and amplitude sensitivities. A large analyte refractive index (RI) range from 1.33 to 1.42 is calculated to investigate the sensing performance of the sensor, and an extremely high wavelength sensitivity of 13,500 nm/refractive index unit (RIU) is obtained. The silver layer thickness, which may affect the sensing performance, is also discussed. This work can provide a reference for developing a high sensitivity, real-time, fast-response, and distributed SPR RI sensor.

No MeSH data available.


(a) Loss spectra of x- and y-polarized peaks with silver layer thicknesses 30 nm, 40 nm and 50 nm when analyte RI is 1.33; (b) x- and y-polarized peak losses with silver layer thicknesses changes from 30 nm to 80 nm when analyte RI is 1.33.
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sensors-15-17106-f005: (a) Loss spectra of x- and y-polarized peaks with silver layer thicknesses 30 nm, 40 nm and 50 nm when analyte RI is 1.33; (b) x- and y-polarized peak losses with silver layer thicknesses changes from 30 nm to 80 nm when analyte RI is 1.33.

Mentions: Surface plasmonic waves are very sensitive to the thickness of the silver layer. As shown in Figure 5a, the loss spectra of the x- and y-polarized peaks vary considerably with the silver layer thickness changes from 30 nm to 50 nm when analyte RI is 1.33. Generally, x- and y-polarized peaks all shift to the longer wavelength as the silver layer becomes thicker and the peak losses decrease gradually. As the silver layer thickness continues to increase, from Figure 5b we can see that the decrease of x- and y-polarized peak losses become slower. Thus, when performing experiments, we can tune the peak loss to a desired value by adjusting the silver layer thickness.


An Exposed-Core Grapefruit Fibers Based Surface Plasmon Resonance Sensor.

Yang X, Lu Y, Wang M, Yao J - Sensors (Basel) (2015)

(a) Loss spectra of x- and y-polarized peaks with silver layer thicknesses 30 nm, 40 nm and 50 nm when analyte RI is 1.33; (b) x- and y-polarized peak losses with silver layer thicknesses changes from 30 nm to 80 nm when analyte RI is 1.33.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541925&req=5

sensors-15-17106-f005: (a) Loss spectra of x- and y-polarized peaks with silver layer thicknesses 30 nm, 40 nm and 50 nm when analyte RI is 1.33; (b) x- and y-polarized peak losses with silver layer thicknesses changes from 30 nm to 80 nm when analyte RI is 1.33.
Mentions: Surface plasmonic waves are very sensitive to the thickness of the silver layer. As shown in Figure 5a, the loss spectra of the x- and y-polarized peaks vary considerably with the silver layer thickness changes from 30 nm to 50 nm when analyte RI is 1.33. Generally, x- and y-polarized peaks all shift to the longer wavelength as the silver layer becomes thicker and the peak losses decrease gradually. As the silver layer thickness continues to increase, from Figure 5b we can see that the decrease of x- and y-polarized peak losses become slower. Thus, when performing experiments, we can tune the peak loss to a desired value by adjusting the silver layer thickness.

Bottom Line: The asymmetrically coated fiber can support two separate resonance peaks (x- and y-polarized peaks) with orthogonal polarizations and x-polarized peak, providing a much higher peak loss than y-polarized, also the x-polarized peak has higher wavelength and amplitude sensitivities.A large analyte refractive index (RI) range from 1.33 to 1.42 is calculated to investigate the sensing performance of the sensor, and an extremely high wavelength sensitivity of 13,500 nm/refractive index unit (RIU) is obtained.The silver layer thickness, which may affect the sensing performance, is also discussed.

View Article: PubMed Central - PubMed

Affiliation: College of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China. yangxianchao@tju.edu.cn.

ABSTRACT
To solve the problem of air hole coating and analyte filling in microstructured optical fiber-based surface plasmon resonance (SPR) sensors, we designed an exposed-core grapefruit fiber (EC-GFs)-based SPR sensor. The exposed section of the EC-GF is coated with a SPR, supporting thin silver film, which can sense the analyte in the external environment. The asymmetrically coated fiber can support two separate resonance peaks (x- and y-polarized peaks) with orthogonal polarizations and x-polarized peak, providing a much higher peak loss than y-polarized, also the x-polarized peak has higher wavelength and amplitude sensitivities. A large analyte refractive index (RI) range from 1.33 to 1.42 is calculated to investigate the sensing performance of the sensor, and an extremely high wavelength sensitivity of 13,500 nm/refractive index unit (RIU) is obtained. The silver layer thickness, which may affect the sensing performance, is also discussed. This work can provide a reference for developing a high sensitivity, real-time, fast-response, and distributed SPR RI sensor.

No MeSH data available.