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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) Cross-section of the commercial grapefruit fiber; (b) Schematic of the designed EC-GF-based SPR sensor.
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sensors-15-17106-f001: (a) Cross-section of the commercial grapefruit fiber; (b) Schematic of the designed EC-GF-based SPR sensor.

Mentions: The cross-section of commercial grapefruit fiber is shown in Figure 1a. The schematic of the designed EC-GF-based SPR sensor is shown in Figure 1b. The thickness of the core struts are c = 2 μm. The diameters of the core and the air holes are dc = 20 μm and d = 80 μm, respectively. The exposed section of the fiber is coated with a 40 nm silver layer. Coating of the metal layers can be performed either with a chemical vapor deposition technique [11] or a wet chemistry deposition technique [12], which is much easier than inside coating of the fiber holes in operation. The refractive index of the EC-GF material is assumed to be 1.45 (fused silica), and the refractive index of the silver is given by the Handbook of Optics [13].


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

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

(a) Cross-section of the commercial grapefruit fiber; (b) Schematic of the designed EC-GF-based SPR sensor.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17106-f001: (a) Cross-section of the commercial grapefruit fiber; (b) Schematic of the designed EC-GF-based SPR sensor.
Mentions: The cross-section of commercial grapefruit fiber is shown in Figure 1a. The schematic of the designed EC-GF-based SPR sensor is shown in Figure 1b. The thickness of the core struts are c = 2 μm. The diameters of the core and the air holes are dc = 20 μm and d = 80 μm, respectively. The exposed section of the fiber is coated with a 40 nm silver layer. Coating of the metal layers can be performed either with a chemical vapor deposition technique [11] or a wet chemistry deposition technique [12], which is much easier than inside coating of the fiber holes in operation. The refractive index of the EC-GF material is assumed to be 1.45 (fused silica), and the refractive index of the silver is given by the Handbook of Optics [13].

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.