In a prism coupler, a surface plasmonic wave excitation mechanism, the propagating efficiency can be enhanced by employing the grating structure on the thin metal film portion. This study suggests a systematic design approach for the grating structure design using numerical optimization techniques such as the parameter and topology optimization method. The wave propagation model was solved by the finite element analysis, and the design process has been proceeded by the gradient based optimal design method. It is found that the plasmonic wave propagation efficiency is improved by adopting the irregular grating structure obtained from the suggested process.
Bibliographical noteFunding Information:
This work was supported by Mid-career Researcher Program through NRF grant funded by the MEST (No. 2010-0000366).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Electrical and Electronic Engineering