Double Polarization Peak Shift Sensitivity (DPPSS): An interrogation technique for a PCF SPR sensor

This research article provides a comprehensive analysis of a localized surface plasmon resonance (LSPR) based sensor, which operates in the visible to near-infrared region and uses a distinctive combination of two metals, ITO and Au as the plasmonic layers to achieve exceptional sensitivity. The wavelength spectrum that this sensor can now measure has been extended by combining these two materials in the RI region of 1.30 to 1.41, allowing the sensor to function in diverse fields such as bioimaging, biosensing, photocatalysis etc. A distinct and novel characteristic of the sensor which is termed as double polarization peak shift sensitivity (DPPSS) is proposed in this manuscript indicating the detection of resonance peak shift in both x-pol and y-pol simultaneously. DPPSS serves as the evaluative parameter for assessing the performance of the sensor. After optimizing all the structural parameters of the proposed sensor on the basis of DPPSS, it is found that the ultimate DPPSS value is 19560 nm/RIU and the maximum wavelength sensitivity is 19630 nm/RIU. Along with having a great sensitivity, the suggested sensor is fabrication friendly. The proposed research serves as a foundation for a thorough exploration of the LSPR phenomena for PCF in double metal scenario. © 2024 Elsevier GmbH