论文标题
氮化硼的图像极化剂，用于极度损失的极端极化限制
Image polaritons in boron nitride for extreme polariton confinement with low losses
论文作者
论文摘要
二维材料中的极化子提供了极端的光限制，金属等离子体学很难实现。但是，这种紧密的限制不可避免地通过各种阻尼通道增加了光损失。在这里，我们证明了六角形氮化硼中的双曲线声子北极子可以克服这一基本权衡。在两个观察到的偏光子模式中，具有对称和反对称电荷分布，后者表现出较低的光损失和更严格的极化剂限制。通过我们的谐振设计，可以通过虚拟极性模式使用我们配音图像极性的图像电荷来提高耦合效率的远场激发和检测这种高摩托马模式。使用这些图像极化子，我们在实验上观察到了高达132的创纪录的高效指数，质量因素高达501。此外，我们的现象学理论表明，双曲线表面散射在双曲线声子极化子的阻尼过程中的重要作用。
Polaritons in two-dimensional materials provide extreme light confinement that is difficult to achieve with metal plasmonics. However, such tight confinement inevitably increases optical losses through various damping channels. Here we demonstrate that hyperbolic phonon polaritons in hexagonal boron nitride can overcome this fundamental trade-off. Among two observed polariton modes, featuring a symmetric and antisymmetric charge distribution, the latter exhibits lower optical losses and tighter polariton confinement. Far-field excitation and detection of this high-momenta mode becomes possible with our resonator design that can boost the coupling efficiency via virtual polariton modes with image charges that we dub image polaritons. Using these image polaritons, we experimentally observe a record-high effective index of up to 132 and quality factors as high as 501. Further, our phenomenological theory suggests an important role of hyperbolic surface scattering in the damping process of hyperbolic phonon polaritons.
