Hyperbolic Phonon Polaritons in Suspended Hexagonal Boron Nitride
Hyperbolic Phonon Polaritons in Suspended Hexagonal Boron Nitride
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DOI：
10.1021/acs.nanolett.8b04242
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发表时间：
2019-02-01
期刊：
影响因子：
10.8
通讯作者：
Alu, Andrea
中科院分区：
文献类型：
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作者：
Dai, Siyuan;Quan, Jiamin;Alu, Andrea
六方氮化硼中的高限制和低损耗双曲声子极化激元具有类似于表面等离子体激元的性质，但具有增强的限制和较低的损耗。到目前为止，它们的性质主要是在介电衬底上研究的，介电衬底为极化激元传播提供了不对称的环境，并增加了阻尼。在这项工作中，我们研究了双曲声子极化激元悬浮六方氮化硼，表现出显着的性能，包括延长极化激元波长和降低阻尼，高达18%的低相比，介电背衬样品。我们使用六方氮化硼中的极化激元的实空间纳米成像来演示和可视化这些效应。我们的研究结果表明，悬浮氮化硼提供了更好的品质因数极化激元传输，这是可推广到其他极化激元材料，他们可以探索先进的纳米光子应用的异质结构。
Highly confined and low-loss hyperbolic phonon polaritons in hexagonal boron nitride possess properties analogous to surface plasmon polaritons, but with enhanced confinement and lower loss. Their properties have been so far mostly studied on dielectric substrates, which provide an asymmetric environment for polariton propagation, and add to damping. In this work, we investigate hyperbolic phonon polaritons over suspended hexagonal boron nitride, showing remarkable properties, including elongated polariton wavelength and reduced damping, up to 18% lower compared to dielectric-backed samples. We use real-space nanoimaging of the polaritons in hexagonal boron nitride to demonstrate and visualize these effects. Our results indicate that suspended boron nitride offers better figures of merit for polariton transport, which are generalizable to other polaritonic materials, and they may be explored in heterostructures for advanced nanophotonic applications.