Exploiting a strong coupling regime of organic pentamer surface plasmon resonance based on the Otto configuration for creatinine detection

Journal: Optics Express (click here for full paper)

Authors: Muhammad Asif Ahmad Khushaini, Nur Hidayah Azeman, Muhamad Mat Salleh, Tg Hasnan Tg Abdul Aziz, Ahmad Ashrif A Bakar, Richard M. De La Rue, Ahmad Rifqi Md Zain

Contact details for further info: rifqi@ukm.edu.my

Summary:

The sandwiched material-analyte layer in the surface plasmon resonance (SPR)-Otto configuration emulates an optical cavity and, coupled with large optical nonlinearity material, the rate of light escaping from the system is reduced, allowing the formation of a strong coupling regime. Here, we report an organic pentamer SPR sensor using the Otto configuration to induce a strong coupling regime for creatinine detection. Prior to that, the SPR sensor chip was modified with an organic pentamer, 1,4-bis[2-(5-thiophene-2-yl)-1-benzothiopene]-2,5-dioctyloxybenzene (BOBzBT₂). To improve the experimental calibration curve, a normalisation approach based on the strong coupling-induced second dip was also developed. By using this procedure, the performance of the sensor improved to 0.11 mg/dL and 0.36 mg/dL for the detection and quantification limits, respectively.