Efficient Coupling in Transverse Strip Metal-Insulator-Metal Structure on Silicon-on-Insulator Layer Stack

• Published in: SILICON Vol. 14; no. 6; pp. 2921 - 2929
• Main Authors: Sadeghzadeh Maraghi, Vahid, Eslami, Mahdi, Nikoufard, Mahmoud
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.04.2022; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Computer engineering; Coupling; Environmental Chemistry; Inorganic Chemistry; Insulators; Integrated circuits; Lasers; Materials Science; Optical Devices; Optics; Original Paper; Photonics; Polymer Sciences; Propagation; Semiconductors; Silicon; SOI (semiconductors); Strip; Waveguides; Plasmonic waveguide; Transverse strip metal-insulator-metal; Photonic integrated circuits; Silicon-on-insulator
• ISSN: 1876-990X; 1876-9918
• DOI: 10.1007/s12633-021-01094-4

This article presents a new directional coupling between two transverse strip metal-insulator-metal (TS-MIM) waveguides on silicon-on-insulator (SOI) platform at 1.55 μm wavelength. The directional coupling between two TS-MIM waveguides shows a coupling length of less than 2 μm for a ridge width and gap width of 150 nm and 50 nm, respectively. Meanwhile, a direct coupling between a hybrid plasmonic (HP) waveguide and a TS-MIM waveguide was also investigated. The maximum optical power transmission from the HP-waveguide to the TS-MIM waveguide will occur at 1.3 μm long TS-MIM waveguide. An HP-waveguide coupled to the TS-MIM waveguide with a tapered tip is incredibly beneficial in nanofocusing applications.