Lithography-free IR polarization converters via orthogonal in-plane phonons in α-MoO(3) flakes.
Lithography-free IR polarization converters via orthogonal in-plane phonons in α-MoO(3) flakes.
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DOI：
10.1038/s41467-020-19499-x
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发表时间：
2020-11-13
影响因子：
16.6
通讯作者：
Aydin K
中科院分区：
文献类型：
--
作者：
Abedini Dereshgi S;Folland TG;Murthy AA;Song X;Tanriover I;Dravid VP;Caldwell JD;Aydin K
利用天然vdW材料中的极性已经成功地实现了极端光约束和低损耗光学器件，并实现了简化的器件集成。最近，α-MoO3被报道为一种半导体双轴vdW材料，能够在红外中保持自然正交的平面内声子极化子模式。在本研究中，我们研究了用α-MoO3形成的空腔的偏振相关光学特性，以扩展利用该材料的面内各向异性设计红外光子元件的自由度。在α-MoO3的多层Fabry-Perot结构中，α-MoO3的偏振依赖性吸收超过80%，而无需在α-MoO3上进行纳米级制备。我们观察到α-MoO3光学声子与法布里-珀罗腔共振之间的耦合。利用交叉偏振反射光谱，我们发现强双折射导致15%的总功率转化为相对于入射波的正交偏振。这些发现可以为探索偏振滤光器和低损耗集成平面红外光子学以及指示偏振控制开辟新的途径。在这里，作者研究了用α-MoO3形成的空腔的偏振相关光学特性，以扩展利用该材料的面内各向异性设计红外光子元件的自由度。据报道，在不需要纳米级制造的情况下，吸收超过80%和偏振转换。
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, α-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 α-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 α-MoO3 is reported without the need for nanoscale fabrication on the α-MoO3. We observe coupling between the α-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. Here, the authors investigate the polarization-dependent optical characteristics of cavities formed using α-MoO3 to extend the degrees of freedom in the design of IR photonic components exploiting the in-plane anisotropy of this material. Absorption over 80% and polarization conversion is reported without the need for nanoscale fabrication.
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