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- W4381729992 abstract "Thin-film lithium niobate (TFLN) has been considered as one of the most important platforms for constructing high-performance photonic integrated devices such as electro-optic modulators, frequency combs, classical/quantum light sources, and large-scale photonic integrated circuits, benefiting from its excellent optical properties of TFLN. The fabrication quality of TFLN photonic integrated devices plays an important role in the performance and the integration scale of these devices. As one of the element photonic structures, the state-of-the-art TFLN microrings reach an intrinsic Q factor higher than 10^7 with ultra-smooth sidewalls, fabricated by photolithography assisted chemo-mechanical etching (PLACE). However, it is isolated on the chip surface and a tapered fiber is required to couple the light into and out of the resonator. Furthermore, it is difficult to maintain such high-Q factors when the microrings are monolithically integrated with bus waveguides by PLACE, resulted from large coupling loss with biggish coupling gap. Here, a relatively narrow gap of an ultra-high Q microring monolithically integrated with the bus-waveguide is achieved with 3.8 um by optimizing PLACE process, and a high temperature annealing is carried out to improve the loaded (intrinsic) Q factor with 4.29 X 10^6 (4.04 X 10^7), leading an ultra-low propagation loss of less than 1 dB/m, which is approximately 3 times better than the best values previously reported in ion-slicing TFLN platform." @default.
- W4381729992 created "2023-06-24" @default.
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- W4381729992 date "2023-06-18" @default.
- W4381729992 modified "2023-10-14" @default.
- W4381729992 title "Ultra-high Q lithium niobate microring monolithically fabricated by photolithography assisted chemo-mechanical etching" @default.
- W4381729992 doi "https://doi.org/10.48550/arxiv.2306.10504" @default.
- W4381729992 hasPublicationYear "2023" @default.
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