论文标题
带有元原子的悬浮光学机械
Levitated Optomechanics with Meta-Atoms
论文作者
论文摘要
我们建议通过捕获元原子，即支持MIE共振的元波长度和高渗透性介电粒子来引入额外的控制。特别地，我们从理论上证明了真空中硅纳米颗粒的光悬浮和质量中心地面冷却不仅在实验上是可行的，而且就陷阱频率和陷阱深度而言，它在广泛使用的硅胶颗粒上提供了增强的性能。此外，我们表明，通过调整诱捕激光器相对于粒子的共振的失沟，极化性的符号变为负面，从而在激光强度的最小值中实现了悬浮。在常驻波的节点上。后者打开了将纳米颗粒捕获在光学近场中的纳米颗粒的门，以红色和蓝色的频率相结合，类似于两级原子，这对于与光子纳米结构和短距离力传感产生了强耦合非常有意义。
We propose to introduce additional control in levitated optomechanics by trapping a meta-atom, i.e. a subwavelength and high-permittivity dielectric particle supporting Mie resonances. In particular, we theoretically demonstrate that optical levitation and center-of-mass ground-state cooling of silicon nanoparticles in vacuum is not only experimentally feasible but it offers enhanced performance over widely used silica particles, in terms of both trap frequency and trap depth. Moreover, we show that, by adjusting the detuning of the trapping laser with respect to the particle's resonance, the sign of the polarizability becomes negative, enabling levitation in the minimum of laser intensity e.g. at the nodes of a standing wave. The latter opens the door to trapping nanoparticles in the optical near-field combining red and blue-detuned frequencies, in analogy to two-level atoms, which is of interest for generating strong coupling to photonic nanostructures and short-distance force sensing.
