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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) X- and y-polarized peak losses with analyte RI changes from 1.33 to 1.42; (b) Wavelength sensitivity of x- and y-polarized peaks with analyte RI changes from 1.33 to 1.42.
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sensors-15-17106-f004: (a) X- and y-polarized peak losses with analyte RI changes from 1.33 to 1.42; (b) Wavelength sensitivity of x- and y-polarized peaks with analyte RI changes from 1.33 to 1.42.

Mentions: With the analyte RI increasing, as shown in Figure 4a, x- and y-polarized peak losses all increases, but the x-polarized peak loss increases much more quickly than the y-polarized, resulting in the gap between the x-polarized peak loss and the y-polarized getting larger and larger. From Figure 4b we can see that both the x- and y-polarized peaks show higher sensitivity for the high analyte RI change than the low. For example, the x-polarized wavelength sensitivity is 13,500 nm/RIU when analyte RI changes from 1.41 to 1.42, which is much higher than 2000 nm/RIU when analyte RI changes from 1.33 to 1.34. The reason is that when the analyte RI increasing from 1.33 to 1.42, the effective RI of the plasmonic mode is getting more and more close to the effective RI of the core-guided mode (1.45), then the mode coupling will be enhanced, leading to a larger peak loss and higher sensitivity. Considering the wavelength sensitivity and the loss peak amplitude, the x-polarized resonance peak is more suitable for RI sensing. The detailed wavelength sensitivities of x-polarized peaks when analyte RI increasing from 1.33 to 1.42 is 2000 nm/RIU, 2400 nm/RIU, 2800 nm/RIU, 3300 nm/RIU, 4100 nm/RIU, 5200 nm/RIU, 6700 nm/RIU, 9100 nm/RIU, and 13,500 nm/RIU, respectively. The highest wavelength sensitivity is 13,500 nm/RIU and the minimum resolution is 7.41 × 10−5 RIU when the spectrograph resolution is 1 nm, which is higher than other exposed-core fiber based SPR sensors [9,10].


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

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

(a) X- and y-polarized peak losses with analyte RI changes from 1.33 to 1.42; (b) Wavelength sensitivity of x- and y-polarized peaks with analyte RI changes from 1.33 to 1.42.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17106-f004: (a) X- and y-polarized peak losses with analyte RI changes from 1.33 to 1.42; (b) Wavelength sensitivity of x- and y-polarized peaks with analyte RI changes from 1.33 to 1.42.
Mentions: With the analyte RI increasing, as shown in Figure 4a, x- and y-polarized peak losses all increases, but the x-polarized peak loss increases much more quickly than the y-polarized, resulting in the gap between the x-polarized peak loss and the y-polarized getting larger and larger. From Figure 4b we can see that both the x- and y-polarized peaks show higher sensitivity for the high analyte RI change than the low. For example, the x-polarized wavelength sensitivity is 13,500 nm/RIU when analyte RI changes from 1.41 to 1.42, which is much higher than 2000 nm/RIU when analyte RI changes from 1.33 to 1.34. The reason is that when the analyte RI increasing from 1.33 to 1.42, the effective RI of the plasmonic mode is getting more and more close to the effective RI of the core-guided mode (1.45), then the mode coupling will be enhanced, leading to a larger peak loss and higher sensitivity. Considering the wavelength sensitivity and the loss peak amplitude, the x-polarized resonance peak is more suitable for RI sensing. The detailed wavelength sensitivities of x-polarized peaks when analyte RI increasing from 1.33 to 1.42 is 2000 nm/RIU, 2400 nm/RIU, 2800 nm/RIU, 3300 nm/RIU, 4100 nm/RIU, 5200 nm/RIU, 6700 nm/RIU, 9100 nm/RIU, and 13,500 nm/RIU, respectively. The highest wavelength sensitivity is 13,500 nm/RIU and the minimum resolution is 7.41 × 10−5 RIU when the spectrograph resolution is 1 nm, which is higher than other exposed-core fiber based SPR sensors [9,10].

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.