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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 analyte RI 1.33 and 1.34; (b) Amplitude sensitivity of x- and y-polarized core modes with analyte RI changes from 1.33 to 1.34.
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sensors-15-17106-f003: (a) Loss spectra of x- and y-polarized peaks with analyte RI 1.33 and 1.34; (b) Amplitude sensitivity of x- and y-polarized core modes with analyte RI changes from 1.33 to 1.34.

Mentions: To investigate the sensing performance of the sensor, a large analyte RI range from 1.33 to 1.42 is calculated. Figure 3a shows the loss spectra of the x- and y-polarized peaks with analyte RI 1.33 and 1.34. The confinement loss is defined as:(1)αloss(dB/m)=8.686⋅k0Im[neff]where is the wavenumber with λ in meters and Im(neff) is the imaginary part of the mode effective RI. We can see that the x-polarized resonance peak presents a much higher peak loss than y-polarized, as the x-polarized resonance peak has a higher coupling efficiency. When the analyte RI changes from 1.33 to 1.34, both the x- and y-polarized peaks all shift to the longer wavelength, but the x-polarized resonance peak has a larger shift (20 nm) than the y-polarized (19 nm). The wavelength sensitivity is defined as:(2)Sλ(nm/RIU)=∂λpeak∂nawhere λpeak is the resonance wavelength and na is the analyte RI. Then the x-polarized resonance peak has a higher wavelength sensitivity (2000 nm/RIU) than y-polarized (1900 nm/R). If the spectral variation of 1 nm can be accurately detected by the spectrograph, then the sensor’s detection resolution is R = 1/Sλ. The resolution of x- and y-polarized peaks are 5 × 10−4 RIU and 5.26 × 10−4 RIU, respectively.


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 analyte RI 1.33 and 1.34; (b) Amplitude sensitivity of x- and y-polarized core modes with analyte RI changes from 1.33 to 1.34.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17106-f003: (a) Loss spectra of x- and y-polarized peaks with analyte RI 1.33 and 1.34; (b) Amplitude sensitivity of x- and y-polarized core modes with analyte RI changes from 1.33 to 1.34.
Mentions: To investigate the sensing performance of the sensor, a large analyte RI range from 1.33 to 1.42 is calculated. Figure 3a shows the loss spectra of the x- and y-polarized peaks with analyte RI 1.33 and 1.34. The confinement loss is defined as:(1)αloss(dB/m)=8.686⋅k0Im[neff]where is the wavenumber with λ in meters and Im(neff) is the imaginary part of the mode effective RI. We can see that the x-polarized resonance peak presents a much higher peak loss than y-polarized, as the x-polarized resonance peak has a higher coupling efficiency. When the analyte RI changes from 1.33 to 1.34, both the x- and y-polarized peaks all shift to the longer wavelength, but the x-polarized resonance peak has a larger shift (20 nm) than the y-polarized (19 nm). The wavelength sensitivity is defined as:(2)Sλ(nm/RIU)=∂λpeak∂nawhere λpeak is the resonance wavelength and na is the analyte RI. Then the x-polarized resonance peak has a higher wavelength sensitivity (2000 nm/RIU) than y-polarized (1900 nm/R). If the spectral variation of 1 nm can be accurately detected by the spectrograph, then the sensor’s detection resolution is R = 1/Sλ. The resolution of x- and y-polarized peaks are 5 × 10−4 RIU and 5.26 × 10−4 RIU, respectively.

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.