Simin Yu, Ruixin Zhou, Guangcanlan Yang, Qiang Zhang, Huizong Zhu, Yuanhao Yang, Xin‐Biao Xu, Baile Chen, Chang‐Ling Zou, Juanjuan Lu
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On‐Chip Brillouin Amplifier in Suspended Lithium Niobate Nanowaveguides
Thin film lithium niobate (TFLN) has emerged as a leading material platform for integrated nonlinear photonics, enabling transformative applications such as broadband Kerr soliton microcomb and high‐speed electro‐optic modulation. While stimulated Brillouin scattering has been numerically proposed in TFLN, achieving sufficient gain remains challenging due to the requirement for the simultaneous low optical and mechanical losses of the device. In this work, the angle‐dependence of Brillouin gain coefficients in x‐cut membrane‐suspended TFLN nanowaveguides is systematically characterized, taking into account the anisotropy of the photoelastic coefficients in lithium niobate. A Brillouin gain coefficient of 129.5 is reported and the Brillouin frequency tuning is further demonstrated through variations in either pump frequency or chip operating temperature. Based on the suspended TFLN nanowaveguide, by optimizing the confinement of both photonic and phononic modes, a Brillouin amplifier with a record‐high gain of 8.5 dB is achieved. This result not only validates the feasibility of strong guided Brillouin interaction using suspended TFLN nanowaveguides, but also paves the way for novel on‐chip sensing and signal processing applications.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.