Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 28, Issue 6, Pages 649-652Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2015.2503801
Keywords
Exposed-core grapefruit fiber; bimetallic structure; surface plasmon resonance; x- and y-polarized peaks; central air hole
Funding
- National Basic Research Program of China (973 Program) [2010CB327801]
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A liquid refractive index (RI) sensor based on an exposed-core grapefruit fiber with a bimetallic structure and a central air hole using surface plasmon resonance (SPR) is presented. The asymmetrically SPR region leading to strong birefringence with x-polarized peak provides much higher peak loss and sensitivity than y-polarized. To match with the plasmon and enhance the mode coupling, we introduce a central air hole to lower the effective RI of the core guided mode. We numerically investigate the effects of the central air hole size, silver layer and gold layer thicknesses on the sensor's performance using wavelength, and amplitude interrogations. A large analyte RI range from 1.33 to 1.42 is evaluated, and the results show that the sensor has a higher sensitivity for high analyte RI change than the low. The extremely high wavelength sensitivity 16 400 nm/RIU at 1.42 is obtained. This letter can provide a reference for developing a high sensitivity, real-time, and distributed SPR sensor.
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