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- W4384261768 abstract "The actual techniques allowing the fabrication of waveguides in lithium niobate are not able to satisfy one of the demands of modern integrated photonics namely well-controlled tunability of index contrast over a large range of values from high-index contrast to low index contrast. This paper presents a simple and reliable method allowing well-controlled index contrast tunability while benefiting from optical nonlinearity of LiNbO$_3$ waveguides fabricated using HiVac-VPE technique. The study involves LiNbO$_3$ planar waveguides subjected to an annealing process for 1 to 5.5 hours. The waveguides are characterized before and after the thermal treatment, in order to determine the index contrast and to analyze the changes of index profile shapes. Furthermore, it is found that the index profile after annealing is fitted by an exponential function different from Gaussian fit found in APE technique. Additionally, index contrast dependence of the annealing time is also fitted by an exponential function. Our findings allow for well-controlled index contrast tunability, between high-index contrast ($Delta n_e=0.1$) and low-index contrast ($Delta n_e=0.035$), of LiNbO$_3$ waveguides offering the opportunity for customization and enhancement of non-linear optical devices and photonics applications." @default.
- W4384261768 created "2023-07-14" @default.
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- W4384261768 date "2023-07-10" @default.
- W4384261768 modified "2023-10-17" @default.
- W4384261768 title "Index contrast tunability of LiNbO$_3$ waveguides obtained by thermal treatment" @default.
- W4384261768 doi "https://doi.org/10.48550/arxiv.2307.05572" @default.
- W4384261768 hasPublicationYear "2023" @default.
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