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An efficient orthogonal coupler for silicon photonics with the degenerate plasmonic modes
1Department of Optics and Photonics, National Central University, No. 300 Zhongda Rd., Zhongli Dis., Taoyuan City 320317, Taiwan, Republic of China.
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An orthogonal coupling structure is proposed to collect the near-infrared lightwaves into a SiO2/Si/SiO2slab waveguide, which is mainly based on the generation of degenerate plasmonic longitudinal modes in an Ag/SiO2/Ag V groove. The coupling efficiency of the proposed plasmonic coupler is higher than 50% in the wavelength range from 1300 nm to 1748 nm. Besides, the highest coupling efficiency (lowest coupling loss) is 87.2% (0.60 dB) atλ0= 1531 nm. The proposed plasmonic structure on top of the silicon-on-insulator substrate can facilitate the development of co-packaged optics.
