2017/09/06 by S. Dai, M. Tymchenko, Y. Yang +8 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1002/adma.201706358
published as Advanced Materials 30, 1706358 (2018) · 16 pages, 4 figures
arxiv created 2017/09/06 · arxiv updated 2018/05/08
Hexagonal boron nitride (hBN) is a natural hyperbolic material that supports both volume-confined hyperbolic polaritons (HPs) and sidewall-confined hyperbolic surface polaritons (HSPs). In this work, we demonstrate effective excitation, control and steering of HSPs in hBN through engineering the geometry and orientation of hBN sidewalls. By combining infrared (IR) nano-imaging and numerical simulations, we investigate the reflection, transmission and scattering of HSPs at the hBN corners with various apex angles. We show that the sidewall-confined nature of HSPs enables a high degree of control over their propagation by designing the geometry of hBN nanostructures.