Numerical Investigation on High-Performance Cu-Based Surface Plasmon Resonance Sensor for Biosensing Application.

This numerical research presents a simple hybrid structure comprised of TiO-Cu-BaTiO for a modified Kretschmann configuration that exhibits high sensitivity and high resolution for biosensing applications through an angular interrogation method. Recently, copper (Cu) emerged as an exceptional choice as a plasmonic metal for developing surface plasmon sensors (SPR) with high resolution as it yields finer, thinner SPR curves than Ag and Au. As copper is prone to oxidation, especially in ambient conditions, the proposed structure involves the utilization of barium titanate (BaTiO) film as a protection layer that not only preserves Cu film from oxidizing but enhances the performance of the sensor to a great extent.