Chen Runkun, Li Peining
Opt Express. 2023 Dec 18;31(26):42995-43003. doi: 10.1364/OE.502399.
Polaritons in reduced-dimensional materials, such as nanowire, nanoribbon and rolled nanotube, usually provide novel avenues for manipulating electromagnetic fields at the nanoscale. Here, we theoretically propose and study hyperbolic phonon polaritons (HPhPs) with rolled one-dimensional molybdenum trioxide (MoO) nanotube structure. We find that the HPhPs in rolled MoO nanotubes exhibit low propagation losses and tunable electromagnetic confinement along the rolled direction. By rolling the twisted bilayer MoO, we successfully achieve a canalized phonon polaritons mode in the rolled nanotube, enabling their propagation in a spiraling manner along the nanotube. Our findings demonstrate the considerable potential of the rolled MoO nanotubes as promising platforms for various applications in light manipulation and nanophotonics circuits, including negative refraction, waveguiding and routing at the ultimate scale.
诸如纳米线、纳米带和卷绕纳米管等低维材料中的极化激元，通常为在纳米尺度上操纵电磁场提供新途径。在此，我们从理论上提出并研究具有卷绕一维三氧化钼（MoO）纳米管结构的双曲线型声子极化激元（HPhPs）。我们发现，卷绕的MoO纳米管中的HPhPs表现出低传播损耗以及沿卷绕方向的可调谐电磁约束。通过卷绕扭曲的双层MoO，我们在卷绕纳米管中成功实现了一种通道化的声子极化激元模式，使其能够沿纳米管呈螺旋状传播。我们的研究结果表明，卷绕的MoO纳米管作为用于光操纵和纳米光子学电路中各种应用（包括负折射、终极尺度下的波导和路由）的有前景平台，具有巨大潜力。
