Monolithic 4H-SiC Strip-loaded Waveguide and Optical Fiber Alignment Methods for Improved Future Optical EIT Control

Beltman, Rick (2023) Monolithic 4H-SiC Strip-loaded Waveguide and Optical Fiber Alignment Methods for Improved Future Optical EIT Control. Master's Thesis / Essay, Physics.

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Abstract

The phenomenon of electromagnetically induced transparency (EIT) with divacancies in silicon carbide (SiC), is a suitable candidate to provide optical control for a quantum memory in quantum repeaters. The maturity of the SiC industry allows for the construction of complex electronic and photonic circuits, which can be used to improve EIT performance. Previous research focused on the application of a monolithic SiC slab waveguide, for increased optical confinement. This thesis is a continuation, where monolithic 4H-SiC strip-loaded waveguides are considered for a future platform for improved EIT measurements, due to the ability of confining light in two dimensions instead of one. To create a contrast in the index of refraction we used doping. However, the contrast that was realized was too low, resulting in a low confinement along the horizontal direction. The coupling of light into the waveguide was done using an optical fiber cable. Therefore, several optical fiber alignment methods were created, in order to increase the coupling efficiency. In addition, this allows for future attachment of the optical fiber to the waveguide, such that during EIT measurements no further alignment has to be performed. These alignment methods can be completed in minutes and allow for micrometer separation between the optical fiber and waveguide. For future research, monolithic 4H-SiC rib waveguides are proposed for their increased horizontal confinement.

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Wal, C.H. van der and Mostovoy, M.V.
Degree programme:	Physics
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	12 Jul 2023 10:03
Last Modified:	12 Jul 2023 10:03
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/30568

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