期刊
NEW JOURNAL OF PHYSICS
卷 22, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab97ea
关键词
photonic molecules; strong coupling; Rabi-splitting; four-wave mixing
资金
- National Key R&D Program of China [2019YFA0705000, 2018YFB2200400]
- National Natural Science Foundation of China [11822410, 11874154, 11874375, 11734009, 61761136006, 11674340, 61675220, 61590934]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB16030300]
- Key Project of the Shanghai Science and Technology Committee [18DZ1112700, 17JC1400400]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- Shanghai Pujiang Program [18PJ1403300]
- Shanghai Rising-Star Program [17QA1404600]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDJ-SSW-SLH010]
- Fundamental Research Funds for the Central Universities [2018FZA5004]
High-quality lithium niobate (LN) thin-film microresonators provide an ideal platform for on-chip nonlinear optical applications. The strict phase-matching condition should be satisfied for an efficient nonlinear optical process, which requires dispersion engineering with an LN microresonator. However, this is challenging in single microresonator, resulting from the fabrication error. Here, we demonstrate strong nonlinear effects in a photonic molecule (PM) structure composed of two strongly coupled lithium niobate microdisks. The size mismatch of the microdisks enables phase matching by employing coupling-induced frequency splitting to compensate for the material and geometric dispersion. With a continuous wave excitation, rich nonlinear optical phenomena including cascaded four-wave mixing and stimulated Raman scattering were observed around the second harmonic signal. Meanwhile, an ultra-high four-wave mixing absolute conversion efficiency of 14% as obtained when the second harmonic signal power is at microwatts level. The LN PM is of great potential for applications in nonlinear integrated photonics.
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