Plasmonic Wave Validation via Finite Element Modeling and Opto-plasmonic System for Biosensor

Plasmonic is light and free electrons interaction in metal nanostructures.Free electrons are oscillated and known as plasmon when light hits the metal.Matched plasmon/ light at respective frequency/ momentum generates a resonance at maximum excitation of plasmonic energy.A resonance shift indicates significant molecular binding for biological matters.Plasmonic biosensors experience unpredictable outcomes without a theoretical agreement.finite element modeling (FEM) could investigate effects, factors and scenarios for a real-time solution.Opto-plasmonic compares FEM to optimize parameters for generating the plasmonic energy.The objective is to perform and validate FEM with an Opto-plasmonic system according to Brewster, critical and resonance angles.A 2D geometries of BK7(1000um)-Au(50nm)-Air(1000nm) were modelled in the Electromagnetic Frequency Domain with Floquet's periodic boundary condition.The Opto-plasmonic consists of 1-Optics (650nm laser, prism, slit, polarizer, photodiode), 2-Mechanical (Bipolar stepper motors, gears, stages) and 3-Electronics (PIC18F4550, LCD and drivers).The P-polarized beam was reflected via a prism and read by a photodiode at 0.045 and 0.1125, respectively.Experimental to FEM accuracy indicates percentage differences for c, r, r, FWHM, and Rmin at 3.72%, 0.2%, 3.37%, 4.64% and 0%, respectively.Excellence validation was successfully achieved between FEM and Optoplasmonic.In conclusion, the opto-plasmonic system can generate plasmonic energy for a biosensor application.