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Permanent link (DOI): https://doi.org/10.7939/R3ST1N
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Light Propagation and Photothermal Nonlinearity in Graphene-Si Waveguides Open Access
- Other title
- Type of item
- Degree grantor
University of Alberta
- Author or creator
Horvath, Cameron S.
- Supervisor and department
Van, Vien (Electrical and Computer Engineering)
- Examining committee member and department
Thundat, Thomas (Chemical and Materials Engineering)
Jacob, Zubin (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Photonics and Plasmas
- Date accepted
- Graduation date
Master of Science
- Degree level
This thesis involves the study of light propagation and photothermal nonlinearity in graphene-silicon waveguides. Graphene, a two-dimensional monolayer of carbon atoms, is attracting a significant amount of interest due to its unique optical properties and its ability to be integrated with existing waveguiding materials such as silicon. Useful graphene photonic devices such as polarizers, modulators and couplers have been demonstrated in literature so far.
Photolithographic patterning techniques that allow for graphene patterning to occur on photonic devices before and after their on-chip realization were developed. Numerical simulations were performed that model the propagation loss and ohmic self-heating in graphene-silicon waveguides. A graphene-silicon waveguide was realized by transferring graphene onto a pre-existing silicon Fabry-Perot waveguide resonator. The linear propagation loss and photothermal nonlinearity of the material system was investigated and compared to a bare silicon waveguide. An 8.8-fold enhancement in the effective thermal nonlinear index was observed.
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