Design of Bragg Grating and Sub-Wavelength Grating Slot Photonic Devices in Silicon-on-Insulator Platforms

  • Krishna Sundar Twayana

Student thesis: Master's Thesis


Silicon photonics is one of the most promising research fields to meet the continuously increasing demand for low-power high-bandwidth datacom components and systems. The compatibility of silicon photonics with standard complementary metal-oxidesemiconductor (CMOS) foundry processes has enabled the rapid progress of this technology over the past decades. The work presented in this thesis focuses on a novel set of silicon photonic devices based on sub-wavelength grating slot (SWGS) waveguides. This waveguide configuration is a combination of sub-wavelength grating waveguides with slot waveguides. In particular, the thesis explores SWGS microring resonators that are suitable for optical sensing. The low-index material is air, which can be easily filled with the analyte to be monitored. The SWGS-based microrings offer improved light confinement in the low-index region, leading to higher sensitivities when compared to other ring resonator configurations. The maximum calculated sensitivity and quality factor of the SWGS resonators are 500 nm/RIU and 3200, respectively. Numerous waveguide geometries are demonstrated through simulations and optical measurements. In addition to the SWGS designs, a comparative study of the spectral response of normal and phase shifted Bragg grating waveguides has also been investigated. Band structure analysis of the strip waveguide Bragg grating is presented in order to quickly assess and compare the performance for the various design parameters.
Date of AwardMay 2017
Original languageAmerican English


  • Silicon Photonics
  • Complementary Metal-Oxide Semiconductor (CMOS)
  • Sub-wavelength Grating Slot (SWGS)
  • Bragg Grating
  • Electronic-Photonic Integrated Circuits (EPIC)
  • waveguides.

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