Qin Qing, Zhang Ji-Zhe, Yang Yuan-Hao, Xu Xin-Biao, Zeng Yu, Wang Jia-Qi, Zou Chang-Ling, Guo Guang-Can, Lin Xiu-Min, Ye Ming-Yong
Appl Opt. 2024 Mar 1;63(7):1719-1726. doi: 10.1364/AO.516362.
On-chip acousto-optic modulators that operate at an optical wavelength of 780 nm and a microwave frequency of 6.835 GHz are proposed. The modulators are based on a lithium-niobate-on-sapphire platform and efficiently excite surface acoustic waves and exhibit strong interactions with tightly confined optical modes in waveguides. In particular, a high-efficiency phase modulator and single-sideband mode converter are designed. We found that for both microwave and optical wavelengths below 1 µm, the interactions at the cross-sections of photonic waveguides are sensitive to the waveguide width and are significantly different from those in previous studies. Our designed devices have small footprints and high efficiencies, making them suitable for controlling rubidium atoms and realizing hybrid photonic-atomic chips. Furthermore, our devices have the potential to extend the acousto-optic modulators to other visible wavelengths for other atom transitions and for visible light applications, including imaging and sensing.
本文提出了一种工作在780纳米光波长和6.835吉赫兹微波频率的片上声光调制器。这些调制器基于蓝宝石上铌酸锂平台，能有效激发表面声波，并与波导中紧密受限的光学模式表现出强烈相互作用。特别地，设计了一种高效相位调制器和单边带模式转换器。我们发现，对于微波和光波长均低于1微米的情况，光子波导横截面处的相互作用对波导宽度敏感，且与先前研究中的情况显著不同。我们设计的器件占地面积小、效率高，适用于控制铷原子并实现混合光子 - 原子芯片。此外，我们的器件有潜力将声光调制器扩展到其他可见光波长，用于其他原子跃迁以及可见光应用，包括成像和传感。
