ANALOGY OF GOLD, SILVER, COPPER AND ALUMINIUM BASED ULTRA SENSITIVE SURFACE PLASMON RESONANCE PHOTONIC CRYSTAL FIBRE BIOSENSORS

Abstract

Biosensors have become increasingly utilised in the medical and pharmaceutical fields in recent years. Surface Plasmon Resonance is one of the most often exploited phenomenon for the development of biosensors. Typically, optical fibres are used to create biosensors. However, the sensing properties are much improved when photonic crystal fibres are used in place of optical fibres. In these sensors, an air-holed surface is encircled by a thin nano film of plasmonic metals, including gold, silver, copper, and aluminium, as well as the plasmonic metal alloy gold-tin, which is filled with an appropriate analyte. Designing an internal type PCF sensor with analyte and several micrometer-sized holes in the centre is the main goal of this paper. One by one, the properties of the various plasmonic materials are examined. Each plasmonic material's amplitude and wavelength sensitivity are calculated. Copper, silver, gold, and aluminium all have wavelength sensitivities of 1799nmRIU-1 , 1830.76nmRIU-1 , 1732nmRIU-1 , and 1652nm/RIU, respectively. The predicted wavelength sensitivity for the Gold-Tin alloy is 1532.2nmRIU-1 .The characteristics of these various sensors are then contrasted. The best results are seen for gold with the same set of settings, but the thickness of the gold layer cannot be decreased to a few nanometers. Thus, silver has been found to be the best suitable metal in terms of stability and a wide variety of criteria.