@article {Yang2018-gn,
	title = {Bridging ultrahigh-Q devices and photonic circuits},
	journal = {Nature Photonics},
	volume = {12},
	number = {5},
	year = {2018},
	pages = {297{\textendash}302},
	publisher = {Springer Science and Business Media LLC},
	abstract = {Optical microresonators are essential to a broad range of technologies and scientific disciplines. However, many of their applications rely on discrete devices to attain challenging combinations of ultra-low-loss performance (ultrahigh Q) and resonator design requirements. This prevents access to scalable fabrication methods for photonic integration and lithographic feature control. Indeed, finding a microfabrication bridge that connects ultrahigh-Q device functions with photonic circuits is a priority of the microcavity field. Here, an integrated resonator having a record Q factor over 200 million is presented. Its ultra-low-loss and flexible cavity design brings performance to integrated systems that has been the exclusive domain of discrete silica and crystalline microcavity devices. Two distinctly different devices are demonstrated: soliton sources with electronic repetition rates and high-coherence/low-threshold Brillouin lasers. This multi-device capability and performance from a single integrated cavity platform represents a critical advance for future photonic circuits and systems.Using silicon nitride waveguides processed by plasma-enhanced chemical vapour deposition, full integration of ultrahigh-Q resonators with other photonic devices is now possible, representing a critical advance for future photonic circuits and systems.},
	url = {https://www.nature.com/articles/s41566-018-0132-5},
	author = {Yang, Ki Youl and Oh, Dong Yoon and Lee, Seung Hoon and Yang, Qi-Fan and Yi, Xu and Shen, Boqiang and Wang, Heming and Vahala, Kerry}
}
