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High-Performance Bimetallic SPR Sensor Based on Periodic-Multilayer-Waveguides

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3 Author(s)
Triranjita Srivastava ; Dept. of Appl. Phys., Delhi Technol. Univ., Delhi, India ; Rajan Jha ; Ritwick Das

We propose a high-performance bimetallic surface plasmon resonance (SPR) sensor based on periodic-multilayer waveguide and analyze its performance with respect to SPR active metals, such as gold (Au) and aluminum (Al). We found that an ultra thin (~ 3 nm) layer of gold (Au) over aluminum (Al) protects aluminum (Al) from oxidation and exhibits better sensor performance. Using couple-mode theory, we show that the sensitivity and detection accuracy could be appropriately tailored for bimetallic (Au+Al) configuration.

Published in:

IEEE Photonics Technology Letters  (Volume:23 ,  Issue: 20 )