Graded photonic crystal terahertz quantum cascade lasers
Graded photonic crystal terahertz quantum cascade lasers
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DOI：
10.1063/1.3273056
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发表时间：
2010-01-18
影响因子：
4
通讯作者：
Davies, A. G.
中科院分区：
文献类型：
--
作者：
Chassagneux, Y.;Colombelli, R.;Davies, A. G.
使用集成光子结构来调整光的行为对于优化性能和将先进功能引入光电器件是非常有前途的。我们展示了一个强大的方法，光子带工程的基础上，允许优化的谐振器的带边光子晶体状态上工作的设备的品质因数。我们还表明，精心设计的π位移在二维光子谐振器提供增强的光束特性。将这些通用技术应用于太赫兹量子级联激光器产生改进的最大操作温度，以及近似12度x8度的角度窄的单瓣表面发射。器件工作频率约为2.8/2.9THz，峰值输出功率为5 mW（78 K）。
The use of integrated photonic structures to tailor the behavior of light is extremely promising for optimizing performance and for introducing advanced functionalities into optoelectronic devices. We demonstrate a powerful method based on photonic-band engineering which allows the optimization of the resonator quality factors of devices operating on band-edge photonic-crystal states. We also show that carefully designed pi-shifts in two-dimensional photonic-resonators give enhanced beam properties. The application of these general techniques to terahertz quantum cascade lasers yields improved maximum operating temperatures, and angularly narrow, single-lobed surface emission of approximate to 12 degrees x8 degrees. The devices operate at approximate to 2.8/2.9 THz, with peak output powers of 5 mW at 78 K.