Development Of Plasmonic Thin Film For Biosensor

Abstract

Biosensor is one of the analytical devices that can detect chemical substance which contain biological component with a physicochemical detector. Optical biosensors are powerful alternative to conventional analytical techniques. Plasmonic biosensors are relying under optical biosensor categories. Previously, biosensor are normally use the tags and label-based detection and it will condition unbinding antigen towards the antibody such an example label is conjugated with one of the bio reactants, labeling can alter the biding properties. Plasmonic biosensor is a biosensor that uses Surface Plasmon Resonance (SPR) theory for its operation. Normally this biosensor is contains from a few components such as light source, prism, metal film, and detector. The metal film part is going to be discussed in this study where the SPR phenomenon will experienced. Gold nanoparticle is being used as the main material to fabricate the substrate and forming the thin film. Stated also gold have good chemical and mechanical stability which will affected the immobilization activity. For the exciting method use for surface plasmon, Krestchmann Configuration is being the most selected one. This obviously will produce a different kind of light reflection and dielectric properties. For the development of this plasmonic thin film the method is going to use is DC magnetron sputtering method and will be test on the rotational angle stage in order to get the optimum energy absorption that produce dark band as the intensity of light being absorb at certain angle. On the same time, simulation for SPR phenomenon oh this thin film was develop and resulting on produce graphical result on light refractive index.