Journal
PLASMONICS
Volume 11, Issue 4, Pages 1119-1128Publisher
SPRINGER
DOI: 10.1007/s11468-015-0150-9
Keywords
Surface plasmon resonance; Bimetallic chip; Noise reduction; Electric field intensity enhancement; Cadmiumion detection
Funding
- National Natural Science Foundation of China (NSFC) [61036012, 21277118]
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We demonstrate that a designed bimetallic chip is capable of improving the performance of a surface plasmon resonance (SPR) sensor based on angular interrogation. Through a numerical simulation and a refractometry experiment, we prove that this bimetallic chip can effectively reduce the noise level by about a factor of 2 compared to the traditional SPR sensors that only use a single gold film. The bimetallic chip presents a lower refractive index resolution of 5.3 x 10(-7) refractive index units. In addition, the enhancement of the electric field intensity at the surface of the configuration by a factor of 2 makes it possible to have a high sensitivity in a larger region, which promotes the biosensing applications of the chip. Through a simple and novel method for the detection of cadmium ions (Cd2+) based on the bimetallic configuration, a detection level for Cd2+ (0.01 mu M or 1.12 ppb) can be realized, which compares favorably with similar studies.
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