Optically Pumped Two-Dimensional MoS2 Lasers Operating at Room-Temperature
Optically Pumped Two-Dimensional MoS2 Lasers Operating at Room-Temperature
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DOI：
10.1021/acs.nanolett.5b01665
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发表时间：
2015-08-01
期刊：
影响因子：
10.8
通讯作者：
Mi, Zetian
中科院分区：
文献类型：
--
作者：
Salehzadeh, Omid;Djavid, Mehrdad;Mi, Zetian
直接带隙半导体二维（2D）过渡金属二硫化物（TMDC）的发现开启了柔性光电器件的新纪元。这一发展的关键是使用新兴的 2D TMDC 实现半导体激光器。在这里，通过在独立式微盘和微球之间的界面嵌入 2D MoS2，我们首次证明了 2D TMDC 的室温激光发射。该器件在类似于 600 至 800 nm 的波长范围内表现出多个激光峰值。在室温下连续波操作下测得阈值与 5 μW 相似。对于比阈值大 2 个数量级以上的泵浦功率，未测量到输出功率饱和。优异的性能归因于2D TMDC的大增益以及2D MoS2增益介质和独特光腔中光模式之间的强耦合。
The discovery of direct bandgap semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDCs) has opened a new era in flexible optoelectronic devices. Critical to this development is the realization of a semiconductor laser using the emerging 2D TMDCs. Here, by embedding 2D MoS2 at the interface between a free-standing microdisk and microsphere, we have demonstrated, for the first time, room-temperature lasing from 2D TMDCs. The devices exhibit multiple lasing peaks in the wavelength range of similar to 600 to 800 nm. The threshold is measured to be similar to 5 mu W under continuous wave operation at room temperature. No saturation in the output power is measured for pump powers more than 2 orders of magnitude larger than the threshold. The superior performance is attributed to the large gain of 2D TMDCs and the strong coupling between the 2D MoS2 gain medium and optical modes in the unique optical cavity.