Anisotropic plasmon induced transparency in black phosphorus nanostrip trimer

We numerically investigate plasmon-induced transparency (PIT) featuring anisotropic high-Q resonance in monolayer black phosphorus (BP) nanostrip trimer. Transparent windows can be observed in both armchair and zigzag directions due to the coupling between the constituent nanostrip elements. By dynamically adjusting the Fermi level (E-F) of BP. we show that the anisotropic and wide-range tuned PIT can be achieved. The strong polarization dependence of BP nanostrip triter has also been studied. Furthermore, we explore the number of induced transparent windows through varying the E-F of left nanostrip in the two parallel strips. The results can be applied to optical filters as well as photonic devices for sensing and communication at mid-infrared region. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement