磷烯π型结构中等离激元诱导透明现象

Plasmon-induced transparency inπ-cascade structure of phosphorene

磷烯因其层数可调的带隙、高的载流子迁移率及面内各向异性等优点为构建基于二维材料的光电子器件提供了新的选择。用时域有限差分法数值模拟了磷烯π型级联和紧凑结构中的等离激元诱导透明现象,通过改变结构分布及磷烯的费米能级等参数,实现了中红外到远红外的宽范围可调谐等离激元诱导透明。其中,透明窗口数目、强度以及位置均实现了灵活调制。此外,研究了诱导透明窗口对偏振角敏感的特性。所得结果为开发基于磷烯等离激元的生物传感器、光电探测器及光开关等提供了参考。

Phosphorene provides a new choice for the construction of optoelectronic devices based on two-dimensional materials because of its adjustable band gap,high carrier mobility and in-plane anisotropy.Plasmon-induced transparen‐cy in theπ-cascade and compact structure of phosphorene was numerically simulated by the finite difference time do‐main method.By changing the structure distribution and Fermi energy level of phosphorene and other parameters,a wide range of tunable plasmon-induced transparency from mid-infrared to far-infrared was realized.Among them,the number,intensity and position of transparent windows are flexibly modulated.In addition,the sensitivity of induced transparent window to the angle of polarization is studied.The results provide a reference for the development of biosen‐sors,photo-detectors and optical switches based on the surface plasmon of phosphorene.