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Title: The study of surface SHG and polygonal microcavity design for nonlinear applications on LiNbO3
Author: Sono, Tleyane J.
ISNI:       0000 0004 2668 7402
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2009
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A z-cut congruent lithium niobate crystal (LiNbO3) has been used in this thesis, as a platform for the surface second harmonic generation (SHG) studies and for the designs of polygonal microcavities for nonlinear applications. Reflection second harmonic generation (RSHG) experiments were performed on LiNbO3 to reveal the interfacial layer symmetry as the crystal is rotated around the z axis. RSHG was also used, unsuccessfully as a non-destructive tool to map the domain-inverted area in the poled LiNbO3 crystals. But nevertheless, the polarity of the direction of the y-axis of the crystal was determined from RSHG data and the data shows that this direction also inverts, during domain inversion. RSHG was used unsuccessfully to monitor the relaxation of the internal field within the domain inverted area of the poled LiNbO3. A general operational principle of optical microcavities was discussed, in which a detailed theory governing the operational modes of a resonating hexagonal microcavity, made from bulk LiNbO3 crystal was reviewed for nonlinear device applications. A model for a total internal reflection (TIR) technique for the QPM method in a double-resonating hexagonal mi- crocavity was formulated. The TIR-QPM model was based on finding a suitable hexagonal dimension in which, both the fundamental and SHG signal resonate simultaneously while at the same time allowing QPM to occur via TIR. The TIR-QPM model and the FDTD simulation were used to demonstrate the potential capability of the double-resonating hexagonal microcavity for efficient SHG. The model to achieve a nonlinear microcavity by periodically poling ring/disk resonator Ti:LiNbO3 ridge waveguide was introduced.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics ; TK Electrical engineering. Electronics Nuclear engineering