Mode Sensitivity Analysis of Subwavelength Grating Slot Waveguides
Journal article, 2019

In this paper, we investigate the mode sensitivity (S-mode) of subwavelength grating slot (SWGS) waveguides. S-mode is an important parameter in various waveguide-based photonic circuits such as sensors, modulators, and thermally-controlled devices. It is a measure of the sensitivity of the waveguide effective index towards the refractive index perturbations in the cladding medium. The SWGS waveguide exhibits high mode sensitivity, as it combines sensitivity enhancement features of both slot and subwavelength grating waveguides. Finite-difference time-domain simulations are performed for the analysis, design, and optimization of the hybrid structure. The SWGS waveguide is incorporated into a Mach-Zehnder interferometer and fabricated on a silicon-on-insulator platform for the experimental estimation of S-mode. The measured S-mode value of 79% is consistent with the theoretical prediction of 83%.

slot waveguide


integrated optics


Subwavelength grating


Mutasem Odeh

Khalifa University

University of California at Berkeley

Krishna Sundar Twayana

Khalifa University

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Karen Sloyan

Khalifa University

Juan E. Villegas

Khalifa University

New York University Abu Dhabi

Sujith Chandran

Khalifa University

Marcus S. Dahlem

Interuniv Microelect Ctr

Khalifa University

IEEE Photonics Journal

1943-0655 (ISSN) 1943-0647 (eISSN)

Vol. 11 5 2700210

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering



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