薄膜铌酸锂上表面声波介导的布里渊温度传感器

中文摘要 AI 辅助

薄膜铌酸锂（TFLN）的出现为在铌酸锂平台上实现强布里渊相互作用铺平了道路，为集成光子学带来了新的机遇。然而，充分利用TFLN中的受激布里渊散射（SBS）以服务于众多布里渊应用仍是一个令人兴奋的研究领域，具有进一步探索和技术进步的巨大潜力。在此，我们首次对TFLN-on-insulator芯片上的表面声波（SAW）介导的布里渊温度传感器进行了全面的实验和数值研究。所提出的技术通过SAW直接感知周围环境，提供了一个与现有集成光子架构兼容的光功率高效平台。利用x-cut TFLN波导中强的模态间布里渊相互作用，我们报告了高达24.8±1.3 m⁻¹W⁻¹的布里渊增益和-0.73±0.02 MHz/°C的温度系数。考虑到铌酸锂的各向异性，我们研究了相对于晶体y轴传播方向为0°、10°、20°、30°时布里渊频率的温度依赖性。

英文摘要

The emergence of thin-film lithium niobate (TFLN) has paved the way for realizing strong Brillouin interactions in lithium niobate platforms, enabling new opportunities in integrated photonics. However, fully harnessing stimulated Brillouin scattering (SBS) in TFLN for the plethora of Brillouin applications remains an exciting area of research, with significant opportunities for further exploration and technological advancement. Here, we present the first comprehensive experimental and numerical study of the surface acoustic wave (SAW)-mediated Brillouin temperature sensor on a TFLN-on-insulator chip. The proposed technique directly senses the surrounding environment via SAWs, providing an optical-power-efficient platform compatible with existing integrated photonic architectures. Exploiting the strong intermodal Brillouin interactions in x-cut TFLN waveguides, we report a high Brillouin gain of 24.8$ \pm $1.3\, m$^{-1}$W$^{-1}$ and a temperature coefficient of $-0.73$ $\pm$ 0.02\,MHz/$^\circ$C. Considering the anisotropic nature of lithium niobate, we investigate the temperature dependence of the Brillouin frequency for the propagation directions 0$^\circ$, 10$^\circ$, 20$^\circ$, 30$^\circ$ relative to the crystallographic y-axis.

发表机构

• Leibniz University Hannover（汉诺威莱布尼茨大学）
• Cluster of Excellence PhoenixD, Leibniz University Hannover（汉诺威莱布尼茨大学光子学、电子学和计算建模卓越集群）
• Max Planck Institute for the Science of Light（马克斯·普朗克光科学研究所）
• Paderborn University（帕德博恩大学）

机构由 AI 辅助整理，请以论文原文为准。

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8 pages, 4 figures