囚禁于双色光学镊中的两个纳米球之间的库仑耦合
Coulomb coupling between two nanospheres trapped in a bichromatic optical tweezer
AI总结：
本文利用1064 nm与976 nm双色激光构建相距约9微米的双光学镊，通过纳米球表面电荷的库仑力实现两球轴向运动强耦合，并由简正模避免交叉加以验证。
摘要：
悬浮光力学正进入多粒子阶段，为利用强耦合大质量振子阵列探索复杂相互作用量子系统铺平道路。在此，我们展示了在双光学镊中囚禁两个纳米球；该双光学镊由工作于不同波长（1064 nm和976 nm）的两束同向传播激光产生。由于光学镊元件的色差，形成了相距约9微米的两个焦点，每个焦点都充当一个二氧化硅纳米粒子的光学阱。在这一距离下，纳米球上的表面电荷产生库仑力，使它们沿光学镊轴的运动发生耦合。所观测到的简正模频率避免交叉证明，系统达到了强耦合区。这些结果凸显了我们的实验方案在未来研究强耦合振子系统方面的潜力，包括在经典和量子区域中将其集成到光学腔中。
英文摘要：
Levitated optomechanics is entering the multiparticle regime, paving the way for the use of arrays of strongly coupled massive oscillators to explore complex interacting quantum systems. Here, we demonstrate the trapping of two nanospheres inside a dual optical tweezer generated by two copropagating lasers operating at different wavelengths (1064 nm and 976 nm). Due to the chromatic aberration of the tweezer optics, two focal points are created approximately 9 microns apart, each one acting as an optical trap for a silica nanoparticle. At this distance, the surface charges on the nanospheres produce a Coulomb force that couples their motion along the tweezer axis. The strong coupling regime is achieved, as evidenced by the observed avoided crossing of the normal-mode frequencies. These results highlight the potential of our experimental scheme for future studies on systems of strongly coupled oscillators, including their implementation in optical cavities, both in the classical and in quantum regime.
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