Research on symmetrical optical waveguide based surface plasmon resonance sensing with spectral interrogation

• Published in: Guang pu xue yu guang pu fen xi Vol. 35; no. 2; p. 289
• Main Authors: Zhang, Yi-long, Liu, Le, Guo, Jun, Zhang, Peng-fei, Guo, Ji-hua, Ma, Hui, He, Yong-hong
• Format: Journal Article
• Language: Chinese
• Published: China 01-02-2015
• Subjects: Glucose - analysis; Remote Sensing Technology; Spectrum Analysis; Surface Plasmon Resonance
• ISSN: 1000-0593
• DOI: 10.3964/j.issn.1000-0593(2015)02-0289-04

Surface plasmon resonance (SPR) sensors with spectral interrogation can adopt fiber to transmit light signals, thus leaving the sensing part separated, which is very convenient for miniaturization, remote-sensing and on-site analysis. Symmetrical optical waveguide (SOW) SPR has the same refractive index of the-two buffer media layers adjacent to the metal film, resulting in longer propagation distance, deeper penetration depth and better performance compared to conventional SPR In the present paper, we developed a symmetrical optical, waveguide (SOW) SPR sensor with wavelength interrogation. In the system, MgF2-Au-MgF2 film was used as SOW module for glucose sensing, and a fiber based light source and detection was used in the spectral interrogation. In the experiment, a refractive index resolution of 2.8 x 10(-7) RIU in fluid protocol was acquired. This technique provides advantages of high resolution and could have potential use in compact design, on-site analysis and remote sensing.