Title :
High-Performance Bimetallic SPR Sensor Based on Periodic-Multilayer-Waveguides
Author :
Srivastava, T. ; Jha, R. ; Das, Ratan
Author_Institution :
Dept. of Appl. Phys., Delhi Technol. Univ., Delhi, India
Abstract :
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.
Keywords :
aluminium; coupled mode analysis; gold; optical films; optical multilayers; optical sensors; optical waveguides; oxidation; surface plasmon resonance; Au-Al; bimetallic configuration; couple-mode theory; high-performance bimetallic SPR sensor; high-performance bimetallic surface plasmon resonance sensor; oxidation protection; periodic-multilayer-waveguides; ultrathin layer; Gold; Optical surface waves; Optical waveguides; Plasmons; Substrates; Tin; Photonic bandgap; plasmonics; sensor;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2162828
