Design of a dual arrow shaped and dual plasmonic material compatible SPR PCF sensor

In this work, the light trapping prowess of photonic crystal fiber (PCF) is used to propose an overly sensitive dual arrow shaped and dual plasmonic material compatible (DPMC) surface plasmon resonance (SPR) sensor. We have used gold (Au) and titanium nitride (TiN) as the plasmonic material on different occasions to proceed during the investigation. The finite element method is utilized to investigate the performance of the surface plasmons with the aid of the COMSOL 5.3 software, having a circular, perfectly matched layer. Maximum sensitivities for wavelength (WS) and amplitude (AS) were obtained about 31,000 nm/RIU and 3629 RIU-1, respectively, having a sensor resolution of 3.23 x 10-6 RIU with a maximum FOM of 1033 for Au. TiN shows a maximum AS of 591 RIU-1, a maximum WS of 67,000 nm/RIU with a resolution of 1.50 x 10-6 RIU and a maximum FOM of 593. The refractive index (RI) range for the target analytes is observed between 1.35 and 1.42. By carefully selecting the plasmonic material, both the advantages of higher AS and WS can be obtained by the same design. According to our knowledge, this paper is the first one where analysis were performed on the same model using two plasmonic materials yielding a very high WS of 67,000 nm/RIU and AS of 3629 RIU-1. With its simplistic construction and appropriate sensitivity, the proposed DPMC-SPR-PCF sensor has potential applications in detecting biomolecules, chemical, and biological analytes.