Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, 78712, USA.
Adv Mater. 2018 Apr;30(16):e1706358. doi: 10.1002/adma.201706358. Epub 2018 Mar 13.
Hexagonal boron nitride (hBN) is a natural hyperbolic material that supports both volume-confined hyperbolic polaritons and sidewall-confined hyperbolic surface polaritons (HSPs). In this work, efficient excitation, control, and steering of HSPs are demonstrated in hBN through engineering the geometry and orientation of hBN sidewalls. By combining infrared nanoimaging and numerical simulations, the reflection, transmission, and scattering of HSPs are investigated at the hBN corners with various apex angles. It is also shown that the sidewall-confined nature of HSPs enables a high degree of control over their propagation by designing the geometry of hBN nanostructures.
六方氮化硼（hBN）是一种天然的双曲材料，它支持体相受限的双曲极化激元和侧壁受限的双曲表面极化激元（HSPs）。在这项工作中，通过工程化设计 hBN 侧壁的几何形状和取向，在 hBN 中实现了 HSPs 的高效激发、控制和转向。通过结合红外纳米成像和数值模拟，研究了具有不同顶角的 hBN 角处 HSPs 的反射、透射和散射。研究还表明，通过设计 hBN 纳米结构的几何形状，可以高度控制 HSPs 的传播，这是由于 HSPs 的侧壁受限特性所致。
