Highly sensitive surface plasmon resonance sensor utilizing a long period grating with photosensitive cladding

作者：Li, Zhihong; Chen, Tao; Zhang, Zhaogang; Zhou, Yanming; Li, Dan; Xie, Zhong^*

来源：Applied Optics, 2016, 55(6): 1470-1480.

DOI：10.1364/AO.55.001470

• OPTICAL WAVE-GUIDES
• PERFECTLY MATCHED LAYER
• COUPLED-MODE THEORY
• FIBER GRATINGS
• SPR SENSORS
• DESIGN
• PERFORMANCE
• PARAMETERS
• BIOSENSORS

In this study, we propose and investigate a novel grating-assisted surface plasmon resonance (SPR) platform based on a silver coated long period fiber grating having a photosensitive cladding (C-LPFG). We show that the SPR mode is transited from the higher EH mode with an effective refractive index (ERI) close to that of the surrounding refractive index (SRI) and is highly sensitive to a change in the SRI. Compared with a conventional SPR sensor, a much higher sensitivity is obtained for the novel C-LPFG-based SPR sensor. The sensitivity can be further improved by reducing the fiber diameter. The numerical results show that the highest local sensitivity, which can be as high as similar to 4900 nm/RIU, and the corresponding resolution of similar to 2.04 x 10(-6) RIU are achieved for the reduced silver coated C-LPFG sensor. Moreover, the Q-factor and the figure of merit exhibit better characteristics than those of the conventional LPFG-based SPR sensor. Our findings provide insight into the C-LPFG-based SPR platform being a potentially important area to explore for biochemical sensing.

• 出版日期2016-2-20
• 单位湖南大学; 宜春学院