论文标题
通过A-MOO3薄片中的正交内部声子通过无光刻的IR极化转换器
Lithography-free IR polarization converters via orthogonal in-plane phonons in a-MoO3 flakes
论文作者
论文摘要
在天然VDW材料中利用极地元素已经成功地实现了极端的光线限制和低损坏的光学设备，并可以实现简化的设备集成。最近，据报道，A-MOO3是一种半导体的双轴VDW材料，能够维持IR中天然正交的平面声子极化模式。在这项研究中，我们研究了使用A-MOO3形成的腔体的极化依赖性光学特性，以扩大利用该材料平面内各向异性的IR光子成分设计中的自由度。据报道，在具有A-MOO3的多层Fabry-Perot结构中，依赖于极化的吸收超过80％，而无需在A-MOO3上进行纳米级制造。我们观察到A-MOO3光学声子与Fabry-Perot腔共振之间的耦合。使用交叉极化反射率光谱，我们表明，强烈的双折射导致相对于入射波转化为正交极化的总功率的15％。这些发现可以打开新的途径，以寻求极化过滤器和低损坏，集成的平面IR光子学并指示极化控制。
Exploiting polaritons in natural vdW materials has been successful in achieving extreme light confinement and low-loss optical devices and enabling simplified device integration. Recently, a-MoO3 has been reported as a semiconducting biaxial vdW material capable of sustaining naturally orthogonal in-plane phonon polariton modes in IR. In this study, we investigate the polarization-dependent optical characteristics of cavities formed using a-MoO3 to extend the degrees of freedom in the design of IR photonic components exploiting the in-plane anisotropy of this material. Polarization-dependent absorption over 80% in a multilayer Fabry-Perot structure with a-MoO3 is reported without the need for nanoscale fabrication on the a-MoO3. We observe coupling between the a-MoO3 optical phonons and the Fabry-Perot cavity resonances. Using cross-polarized reflectance spectroscopy we show that the strong birefringence results in 15% of the total power converted into the orthogonal polarization with respect to incident wave. These findings can open new avenues in the quest for polarization filters and low-loss, integrated planar IR photonics and in dictating polarization control.
