Tunable beam splitter based on hybrid graphene plasmonic waveguide with sub-wavelength grating

• Main Authors: Te-Chia Sun, 孫德嘉
• Other Authors: 黃家健
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/kv98hr

碩士 === 國立中興大學 === 物理學系所 === 106 === In this study we design two kinds of graphene beam splitters that can be regulated with voltage by using multi-mode interference, hybrid waveguide and sub-wavelength grating.The first one is a multi-mode beam splitter that uses multi-modal interference to control the direction of the light field. By configuring the number of graphene layers, hybrid waveguides and sub-wavelength gratings, we shorten the structure from 1200 nm to 620 nm, and the energy output ratio increased from 0.27 to 0.58. The second type is a directional coupler, which uses the coupling length to control the light field direction. By the configuration of the number of graphene layers and the hybrid waveguide, we shorten the structure from 2600 nm to 325 nm, and the energy output ratio increased from 0.07 to 0.46.