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Shao, Linbo

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Shao

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Linbo

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Shao, Linbo
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    On-chip electro-optic frequency shifters and beam splitters
    (Springer Science and Business Media LLC, 2021-11-24) Hu, Yaowen; Yu, Mengjie; Shams Ansari, Amirhassan; Sinclair, Neil; Holzgrafe, Jeffrey; Puma, Eric; Zhang, Mian; Shao, Linbo; Loncar, Marko
    Efficient frequency shifting and beam splitting is important for a wide range of applications, including atomic physics1,2, microwave photonics3–6, optical communication7,8, and photonic quantum computing9–14. However, realizing gigahertz-scale frequency shifts with high efficiency, low loss, and tunability, in particular using a miniature and scalable device, is challenging since it requires efficient and controllable nonlinear processes. Existing approaches based on acousto-optics6,15–17, all-optical wave mixing10,13,18–22, and electro-optics23–27 are either limited to low efficiencies or frequencies, or are bulky. Furthermore, most approaches are not bi-directional, which renders them unsuitable for frequency beam splitters. Here we demonstrate electro-optic frequency shifters that are controlled using only continuous and single-tone microwaves. This is accomplished by engineering the density of states of, and coupling between, optical modes in ultra-low loss waveguides and resonators in lithium niobate nanophotonics28. Our devices, consisting of two coupled-ring-resonators, provide frequency shifts as high as 28 GHz with an ~90% on-chip conversion efficiency. Importantly, the devices can be reconfigured as tunable frequency-domain beam splitters. Using the device, we also demonstrate a non-blocking and efficient swap of information between two frequency channels. Finally, we propose and demonstrate a scheme for cascaded frequency shifting that allows shifts of ~120 GHz using a ~30 GHz continuous and single-tone microwave signal. Our devices could become building-blocks for future high-speed and large-scale classical information processors7,29 as well as emerging frequency-domain photonic quantum computers9,11,14.
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    Non-reciprocal transmission of microwave acoustic waves in nonlinear parity–time symmetric resonators
    (Springer Science and Business Media LLC, 2020-05-18) Shao, Linbo; Mao, Wenbo; Maity, Smarak; Sinclair, Neil; Hu, Yaowen; Yang, Lan; Lončar, Marko
    Taking advantage of the piezoelectricity of lithium niobate, we achieve nonreciprocal transmission of 10 decibels for a 200-MHz surface acoustic wave using parity-time- symmetric resonators and demonstrate one-way circulation of acoustic waves.