Ultrafast All‐Optical Switching of Germanium‐Based Flexible Metaphotonic Devices,Advanced Materials

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Ultrafast All‐Optical Switching of Germanium‐Based Flexible Metaphotonic Devices
Advanced Materials ( IF 27.4 ) Pub Date : 2018-01-12 , DOI: 10.1002/adma.201705331
Wen Xiang Lim _{1,

2} , Manukumara Manjappa _{1,

2} , Yogesh Kumar Srivastava _{1,

2} , Longqing Cong _{1,

2} , Abhishek Kumar _{1,

2} , Kevin F. MacDonald ₃ , Ranjan Singh _{1,

2}

Affiliation

Incorporating semiconductors as active media into metamaterials offers opportunities for a wide range of dynamically switchable/tunable, technologically relevant optical functionalities enabled by strong, resonant light–matter interactions within the semiconductor. Here, a germanium‐thin‐film‐based flexible metaphotonic device for ultrafast optical switching of terahertz radiation is experimentally demonstrated. A resonant transmission modulation depth of 90% is achieved, with an ultrafast full recovery time of 17 ps. An observed sub‐picosecond decay constant of 670 fs is attributed to the presence of trap‐assisted recombination sites in the thermally evaporated germanium film.

中文翻译：

基于锗的柔性超光子器件的超快全光交换

通过将半导体作为活性介质整合到超材料中，可以通过半导体内部强大的，共振的光-物质相互作用实现各种动态可切换/可调谐的，与技术相关的光学功能。在此，通过实验证明了基于锗薄膜的柔性亚光子器件，可实现太赫兹辐射的超快光开关。实现了90％的谐振传输调制深度，超快的全恢复时间为17 ps。皮秒观察到的670 fs的衰减常数归因于在热蒸发的锗膜中存在陷阱辅助的复合位点。

更新日期：2018-01-12

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