Journal
OPTICS EXPRESS
Volume 30, Issue 12, Pages 20839-20846Publisher
Optica Publishing Group
DOI: 10.1364/OE.459315
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Funding
- National Major Research and Development Program [2019YFB2203603]
- National Natural Science Foundation of China [61922070, 6213000026]
- Fundamental Research Funds for the Central Universities
- Pioneer and Leading Goose R&D Program of Zhejiang [2022C01103]
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Researchers have designed a photonic crystal nanobeam cavity on an etchless LiNbO3-On-Insulator platform, utilizing photonic bound states in the continuum to achieve a high Q factor. This opens up possibilities for manufacturing high-efficiency electro-optic modulators.
Photonic crystal (PhC) cavities with high Q factor and low volume have been applied in nonlinear, electro-optic and acoustic-optic devices due to the enhancement of the light-matter interactions. However, there are few devices and research on LiNbO3 (LN) PhC cavities due to the difficulty in making hyperfine structures on LN platform. In this work, we propose a PhC nanobeam cavity on the etchless x-cut LiNbO3-On-Insulator (LNOI). The fabrication-friendly device has been designed based on photonic bound states in the continuum (BICs) exhibiting a high Q factor of over 10,000 with the device length of only about 100 mu m. Utilizing the electro-optical effect gamma(13 )of LN, we demonstrate an ultra-compact electro-optic modulator based on the PhC nanobeam cavities, which has the modulation efficiency of 1.5 pm/V and the 3 dB bandwidth of 28 GHz. (C) 2022 Optics Publishing Group under the terms of the Optica Open Access Publishing Agreement
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