Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST), Seoul 02792, South Korea.
Nanomaterials Science and Engineering, Korea University of Science and Technology, Daejeon 34113, South Korea.
Sci Rep. 2017 Feb 27;7:43371. doi: 10.1038/srep43371.
The outstanding electronic and optical properties of black phosphorus (BP) in a two-dimensional (2D) but unique single-layer puckered structure have opened intense research interest ranging from fundamental physics to nanoscale applications covering the electronic and optical domains. The direct and controllable electronic bandgap facilitating wide range of tunable optical response coupled with high anisotropic in-plane properties made BP a promising nonlinear optical material for broadband optical applications. Here, we investigate ultrafast optical switching relying on the optical nonlinearity of BP. Wavelength conversion for modulated signals whose frequency reaches up to 20 GHz is realized by four-wave-mixing (FWM) with BP-deposited D-shaped fiber. In the successful demonstration of the FWM based wavelength conversion, performance parameter has been increased up to ~33% after employing BP in the device. It verifies that BP is able to perform efficient optical switching in the evanescent field interaction regime at very high speed. Our results might suggest that BP-based ultra-fast photonics devices could be potentially developed for broadband applications.
黑磷（BP）在二维（2D）但独特的单层褶皱结构中表现出出色的电子和光学性能，从基础物理到涵盖电子和光学领域的纳米尺度应用，激发了广泛的研究兴趣。直接且可控制的电子带隙促进了广泛的可调谐光学响应，加上高各向异性的面内性质，使 BP 成为宽带光应用中很有前途的非线性光学材料。在这里，我们研究了基于 BP 的光学非线性的超快光学开关。通过在 D 形光纤上沉积 BP 来实现四波混频（FWM），实现了调制信号的波长转换，其频率高达 20GHz。在成功演示基于 FWM 的波长转换中，在器件中使用 BP 后，性能参数提高了约 33%。这证明了 BP 能够在非常高的速度下在消逝场相互作用模式下进行有效的光学开关。我们的结果可能表明，基于 BP 的超快光子学器件可潜在地用于宽带应用。
