THE NUMERICAL STUDY OF SURFACE PLASMON POLARITON AT THE SINGLE INTERFACE BETWEEN METAL AND VEGETABLE OILS DIELECTRICS

Abstract

We report the numerical studies of the properties of surface plasmon polaritons which are generated at the single interface between metal and dielectric. In this numerical work, we used parameters representing natural dielectrics. Using Maxwell equations and also the continuity of the fields at the interface between metal and dielectrics, the dispersion relation of the surface plasmon polaritons were derived. The dispersion relations were solved by taking parameters for metal appropriate for gold. For natural dielectric, we used parameters which are correspond to castor oil, coconut oil and sun flower oil with the range of dielectric constants were from tens to sixties. The results showed that the lower part of dispersion curves of surface plasmon polaritons approach SPP frequencies. We found that the highest surface plasmon frequency was resulted by using crude palm oil (CPO) as liquid dielectric. The usage of sunflower oil as dielectric lead to the lowest surface plasmon polaritons frequency.