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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) Wavelength sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm; (b) Amplitude sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm
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sensors-15-17106-f006: (a) Wavelength sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm; (b) Amplitude sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm

Mentions: Figure 6a shows the wavelength sensitivity of the x- and y-polarized peaks with different silver layer thicknesses when analyte RI is 1.33. When the silver layer thickness changes from 30 nm to 80 nm, the wavelength sensitivity of x- and y-polarized peaks all go through a circle of rise and fall, which increase with the increases of silver layer thickness at first. When the silver layer is 70 nm, the sensor has the maximum wavelength sensitivity of 2200 nm/RIU and then it tends to decrease with the continued increase. The x-polarized peak always has a higher wavelength sensitivity than the y-polarized when the silver layer thickness is below 70 nm, but then they have the same wavelength sensitivity when the thickness is more than 70 nm. Contrary to the wavelength sensitivity, the amplitude sensitivity of the x- and y-polarized peaks will always reduce with the silver layer thickness increase, as shown in Figure 6b, and the reduction rate is approximately linear.


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

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

(a) Wavelength sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm; (b) Amplitude sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17106-f006: (a) Wavelength sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm; (b) Amplitude sensitivity of x- and y-polarized peaks with silver layer thicknesses change from 30 nm to 80 nm
Mentions: Figure 6a shows the wavelength sensitivity of the x- and y-polarized peaks with different silver layer thicknesses when analyte RI is 1.33. When the silver layer thickness changes from 30 nm to 80 nm, the wavelength sensitivity of x- and y-polarized peaks all go through a circle of rise and fall, which increase with the increases of silver layer thickness at first. When the silver layer is 70 nm, the sensor has the maximum wavelength sensitivity of 2200 nm/RIU and then it tends to decrease with the continued increase. The x-polarized peak always has a higher wavelength sensitivity than the y-polarized when the silver layer thickness is below 70 nm, but then they have the same wavelength sensitivity when the thickness is more than 70 nm. Contrary to the wavelength sensitivity, the amplitude sensitivity of the x- and y-polarized peaks will always reduce with the silver layer thickness increase, as shown in Figure 6b, and the reduction rate is approximately linear.

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.