Plasmonic Nanosensor for Cancer Cell Detection with Multi Fano Resonance

In the field of biosensing, plasmonics has gained momentum recently as it enables plasmon based circuits to merge two fields of photonics and electronics at nanoscale and also provides the advantage of label-free detection. A Metal Insulator Metal based plasmonic refractive index sensor is conceptualised on panda ring design. Finite Difference Time Domain method is employed to study the transmittance characteristics of the sensor. The transmittance curve exhibits triple Fano Resonances resulting in high sensitivities of 922 nm/RIU, 1730 nm/RIU and 2092.3 nm/RIU for the fano dips at 0.949 mu m, 1.728 mu m and 2.103 mu m respectively. Further investigation is also done with respect to fabrication complexities which may arise using a square slit and its consequent effect on the efficiency of the sensor. The sensor performance is also investigated based on figure of merit which is obtained at a high value of 46.18 RIU-1. The proposed sensor is investigated further for probable detection of cancerous cells namely Jurkat, PC-12, MDA-MB-231, MCF-7 and Basal Cell.