MoS2 for Ultrafast All‐Optical Switching and Modulation of THz Fano Metaphotonic Devices,Advanced Optical Materials

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MoS2 for Ultrafast All‐Optical Switching and Modulation of THz Fano Metaphotonic Devices
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2017-10-23 , DOI: 10.1002/adom.201700762
Yogesh Kumar Srivastava _{1,

2} , Apoorva Chaturvedi ₃ , Manukumara Manjappa _{1,

2} , Abhishek Kumar _{1,

2} , Govind Dayal _{1,

2} , Christian Kloc ₃ , Ranjan Singh _{1,

2}

Affiliation

In recent years, the stunning performance of transition metal dichalcogenides (TMDCs) has been utilized in the area of field effect transistors, integrated circuits, photodetectors, light generation and harvesting, valleytronics, and van der Waals (vdW) heterostructures. However, the optoelectronic application of TMDCs in realizing efficient, ultrafast metaphotonic devices in the terahertz part of the electromagnetic spectrum has remained unexplored. The most studied member of the TMDC family, i.e., MoS₂, shows an ultrafast carrier relaxation after photoexcitation with near‐infrared femtosecond pulse of energy above the bandgap. Here, this study investigates the photoactive properties of MoS₂ to demonstrate an ultrasensitive active switching and modulation of the sharp Fano resonances in MoS₂‐coated metamaterials consisting of asymmetric split ring resonator arrays. The results show that all‐optical switching and modulation of micrometer scale subwavelength Fano resonators can be achieved on a timescale of hundred picoseconds at moderate excitation pump fluences. The precise and active control of the MoS₂‐based hybrid metaphotonic devices open up opportunities for the real‐world technologies and realization of ultrafast switchable sensors, modulators, filters, and nonlinear devices.

中文翻译：

MoS2用于THz Fano超光子器件的超快全光切换和调制

近年来，过渡金属二硫化碳（TMDC）的惊人性能已用于场效应晶体管，集成电路，光电探测器，光产生和收集，山谷电子学和范德华（vdW）异质结构领域。然而，TMDC在光电频谱的太赫兹部分中实现高效，超快的超光子器件的光电应用尚待探索。对TMDC系列的研究最多的成员，即MoS ₂，在光激发后以带隙以上的近红外飞秒能量脉冲显示出超快的载流子弛豫。在这里，这项研究调查了MoS ₂的光活性演示了由不对称裂环谐振器阵列组成的MoS ₂涂层超材料中尖锐的Fano共振的超灵敏有源开关和调制。结果表明，在中等激励泵通量的情况下，可以在几百皮秒的时间范围内实现微米级亚波长Fano谐振器的全光切换和调制。基于MoS ₂的混合超光子器件的精确和主动控制为现实世界技术以及超快可切换传感器，调制器，滤波器和非线性器件的实现打开了机遇。

更新日期：2017-10-23

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