Abstract:
Efficient coupling of light between the dielectric waveguide and plasmonic waveg- uide has been investigated theoretically in three dimensions. An air gap based nanoplasmonic semi-elliptical structure of Silicon (Si) is used as a coupler which connects these waveguides. Finite Integration Technique (FIT) has been deployed for this investigation. Theoretical coupling efficiency of ∼ 85% at optical commu- nication wavelength (1.55 µm) has been achieved through numerical simulations. The dependency of coupling efficiency has been investigated by varying the curva- ture of the semi-elliptical coupler, the air gap width between the two waveguides and the plasmonic width of the Ag-Air-Ag waveguide, and an optimal dimension of the proposed structure has been obtained. Different performance parameters like coupling efficiency, reflection coefficient, Voltage Standing Wave Ratio (VSWR), and return loss have been analyzed with the obtained optimal dimensions. Broad range of operating frequency, tolerance to angular and air gap misalignment and excellent agreement to a demonstrated experimental coupler has made the proposed coupler distinctive.
Description:
Supervised by Dr. Rakibul Hasan Sagor, Assistant Professor,
Department of Electrical and Electronic Engineering, Islamic University of Technology (IUT),
Boardbazar, Gazipur - 1704.
