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. 2013 Jan 15;13(1):956-65.
doi: 10.3390/s130100956.

Surface plasmon resonance sensor based on polymer photonic crystal fibers with metal nanolayers

Ying Lu  1 , Cong-Jing Hao, Bao-Qun Wu, Mayilamu Musideke, Liang-Cheng Duan, Wu-Qi Wen, Jian-Quan Yao
Affiliations

Surface plasmon resonance sensor based on polymer photonic crystal fibers with metal nanolayers

Ying Lu et al. Sensors (Basel). .

Abstract

A large-mode-area polymer photonic crystal fiber made of polymethyl methacrylate with the cladding having only one layer of air holes near the edge of the fiber is designed and proposed to be used in surface plasmon resonance sensors. In such sensor, a nanoscale metal film and analyte can be deposited on the outer side of the fiber instead of coating or filling in the holes of the conventional PCF, which make the real time detection with high sensitivity easily to realize. Moreover, it is relatively stable to changes of the amount and the diameter of air holes, which is very beneficial for sensor fabrication and sensing applications. Numerical simulation results show that under the conditions of the similar spectral and intensity sensitivity of 8.3 × 10(-5)-9.4 × 10(-5) RIU, the confinement loss can be increased dramatically.

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Figures

Figure 1.
Figure 1.
(a) Structure diagram of the large-mode-area plastic photonic crystal fiber; (b) Optical field distribution of the fundamental mode.
Figure 2.
Figure 2.
(a) Relationship between wavelength and attenuation constant of the fundamental mode of the hollow-core large-mode-area PCF. The black and red curves represent the refractive indices of the samples are 1.33 and 1.335 (Δλpeak ≈ 6 nm), respectively; (b) Intensity detection sensitivity curve.
Figure 3.
Figure 3.
Structure diagram of the improved large-mode-area plastic PCF with 125 μm diameter and seven air holes.
Figure 4.
Figure 4.
(a) Relationship between wavelength and attenuation constant of the fundamental mode of the PMMA PCF. The red and blue curves represent the refractive indices of the samples are 1.33 and 1.335 (Δλpeak ≈ 6 nm), respectively; (b) Intensity detection sensitivity curve.
Figure 5.
Figure 5.
(a) the improved structure diagram of the large-mode-area plastic PCF with 125 μm diameter and more air holes; (b) Optical field distribution of the fundamental mode.
Figure 6.
Figure 6.
(a) Relationship between wavelength and attenuation constant of the fundamental mode of the PMMA PCF. The black and red curves represent the refractive indices of the samples are 1.33 and 1.335 (Δλpeak ≈ 6nm), respectively; (b) Intensity detection sensitivity curve.
Figure 7.
Figure 7.
(a) The comparison of attenuation constant of the fundamental mode of different diameters of the air holes (b) The comparison of intensity detection sensitivity curves.
Figure 8.
Figure 8.
Loss spectra of the structure of Figure 5(a) at different silver layer thickness (tAg = 30 nm, 40 nm, 50 nm). Analyte refractive index (na = 1.33).
See this image and copyright information in PMC

References

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