Calculation of spectra and plasmon wave distribution in one dimensional periodic structure Alvin Fariz (1), Rahmat Hidayat (1*)
1) Institut Teknologi Bandung, Physics of Magnetism and Photonics Research Division, Physics Program Study, Faculty of Mathematics and Natural Sciences,
Jl. Ganesha 10, Bandung, West Java, 40132, Indonesia
*Corresponding author: rahmat[at]fi.itb.ac.id
Abstract
Surface Plasmon Resonance (SPR) is a resonance phenomenon between electromagnetic waves and electrons, which is formed on the interface between metal and dielectric surface. SPR waves can be generated by using a coupler element, such as prisms and gratings. In this study, we analyze the effect of groove filling in nanograting structure using computation work based on Rigorous Coupled Wave Analysis (RCWA) method. The structure periodicity is 700 nm with the groove depth of around 350 nm. The reflectance spectra calculation by RCWA method produces the appearance of SPR dip for empty groove (with air inside the groove) at around 550 nm - 650 nm and near infra red region. The dip wavelength varies on the incident angles from 30 up to 60 degree. In addition, the shifting of those dips are also predicted form the calculation results when the groove is filled by a medium with refractive index of 1.5, which can be the basis of its utilization as optical sensing element.
