Vertical strip metal-insulator-metal waveguide based on a silicon-on-insulator platform

Subject Areas : Electronic Engineering

Vahid  Sadeghzadeh Maraghi ¹ (Department of Electrical Engineering, College of Engineering, Islamic Azad University, West Tehran Branch, Tehran, Iran)
Mahmoud  Nikoufard ² (Department of Electronics, Faculty of Electrical and Computer Engineering, University of Kashan, Kashan, Iran)
Mahdi  Eslami ³ (Department of Electrical Engineering, College of Engineering, Islamic Azad University, West Tehran Branch, Tehran, Iran)
Seyyed Hossein  Pishgar Komleh ⁴ (Department of Electrical Engineering, College of Engineering, Islamic Azad University, West Tehran Branch, Tehran, Iran)

Received: 2022-11-08 Accepted : 2023-01-28 Published : 2023-08-23

Keywords: Silicon-on-insulator (SOI), Strip metal-insulator-metal waveguide, Propagation properties, Plasmonic, Nanofocusing, photonic integrated circuits,

Abstract :

This paper proposes a new ultra-compact strip metal-insulator-metal (MIM) plasmonic waveguide on a silicon-on-insulator (SOI) platform. The waveguide structure can efficiently propagate surface plasmon polaritons (SPPs) within a thin low-index SiO2 layer at an optical wavelength window of 1550 nm. The main parameters of effective refractive index, propagation length, confinement factor, and effective mode area were determined for the proposed waveguide with different waveguide widths. The simulation results were comparable with the in-plane MIM plasmonic waveguide. The proposed layer stack could be monolithically integrated with conventional and hybrid plasmonic SOI-based devices and has the potential of focusing light to nanoscale dimensions.

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