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arXiv 2103.17016physics.optics
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等离子体天线对α- MoO3中面内双曲声子极化激元的控制和聚焦

Controlling and focusing of in-plane hyperbolic phonon polaritons in α-MoO3 with plasmonic antenna

Zebo Zheng, Jingyao Jiang, Ningsheng Xu, Ximiao Wang, Wuchao Huang, Yanlin Ke, Huanjun Chen, Shaozhi Deng

摘要:

范德华材料中的双曲声子极化激元(HPhPs)具有将长波电磁场限制到深亚波长尺度的能力。与单轴vdW双曲材料如六方氮化硼(h-BN)形成鲜明对比的是,最近出现的双轴双曲材料如α-MoO 3和α-V2 O 5由于其独特的面内双曲色散,进一步在平坦区控制光方面带来了新的自由度。然而,这种平面内HPhPs的控制和聚焦迄今为止仍然是难以捉摸的。在这里,我们提出了一个通用的技术发射,控制和聚焦的平面HPhPs在α-MoO 3与几何设计的等离子体天线。利用高分辨率近场光学成像技术,我们直接激发并映射了真实空间中的HPhPs波前。我们发现亚波长操纵和聚焦行为强烈依赖于天线末端的曲率。该策略在宽带光谱区域中有效地操作。这些发现不仅可以为双轴双曲晶体在纳米尺度上对光的操纵提供基本的见解,而且还为平面纳米光子应用开辟了新的机会。

英文摘要:

Hyperbolic phonon polaritons (HPhPs) sustained in van der Waals (vdW) materials exhibit extraordinary capabilities of confining long-wave electromagnetic fields to the deep subwavelength scale. In stark contrast to the uniaxial vdW hyperbolic materials such as hexagonal boron nitride (h-BN), the recently emerging biaxial hyperbolic materials such as α-MoO3 and α-V2O5 further bring new degree of freedoms in controlling light at the flatland, due to their distinctive in-plane hyperbolic dispersion. However, the controlling and focusing of such in-plane HPhPs are to date remain elusive. Here, we propose a versatile technique for launching, controlling and focusing of in-plane HPhPs in α-MoO3 with geometrically designed plasmonic antennas. By utilizing high resolution near-field optical imaging technique, we directly excited and mapped the HPhPs wavefronts in real space. We find that subwavelength manipulating and focusing behavior are strongly dependent on the curvature of antenna extremity. This strategy operates effectively in a broadband spectral region. These findings can not only provide fundamental insights into manipulation of light by biaxial hyperbolic crystals at nanoscale, but also open up new opportunities for planar nanophotonic applications.

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