Blue and black phosphorus are the most stable allotropes of phosphorus family. As a new potential semiconductor material, blue phosphorene shows the advantage of its wide indirect bandgap. We investigate fundamental optical properties and tunability of the bandgap of monolayer blue phosphorene based on density functional theory. Our comparative analysis reveals the bandgap adjustability of blue P along the polarization direction and that the plasmons resonance mode of blue phosphorene in different polarization directions. Besides, we report a unique 2D rectangular semiconductor-metal hybrid nanostructures, the monolayer rectangle blue phosphorene inserted into the Au nanowires. Owing to surface plasmon polaritons (SPPs), the absorption spectra of blue phosphorene is broadened and shifted to the infrared region, in which strong characteristic peaks appear and the existence of the coupling of single electron motion and coherent vibration is proved. The results provide the novle principle for optical modulation of blue phosphorene and possible applications in nanoscale plasma devices.

蓝磷和黑磷是磷家族中最稳定的同素异形体。作为一种潜在的新型半导体材料，蓝色磷光体具有其间接带隙宽的优势。我们基于密度泛函理论研究了单层蓝色磷光体的基本光学性质和带隙的可调谐性。我们的比较分析揭示了蓝色P沿极化方向的带隙可调节性，以及蓝色磷光体在不同极化方向上的等离振子共振模式。此外，我们报告了一种独特的二维矩形半导体-金属杂化纳米结构，即单层矩形蓝色磷光体插入到Au纳米线中。由于表面等离振子极化子（SPPs），蓝色磷光体的吸收光谱变宽并移至红外区域，其中出现了很强的特征峰，并证明了单电子运动与相干振动耦合的存在。结果为蓝色磷光的光学调制提供了新颖的原理，并为纳米级等离子体设备提供了可能的应用。