Terahertz bound-to-continuum quantum-cascade lasers based on optical-phonon scattering extraction
Terahertz bound-to-continuum quantum-cascade lasers based on optical-phonon scattering extraction
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DOI：
10.1109/cleoe.2005.1567878
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发表时间：
2005-04
期刊：
影响因子：
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通讯作者：
G. Scalari;N. Hoyler;M. Giovannini;J. Faist
中科院分区：
文献类型：
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作者：
G. Scalari;N. Hoyler;M. Giovannini;J. Faist
在本文中，我们提出了一种新的QC太赫兹激光器的设计，结合了绑定到连续的方法的优点，一起使用的LO声子共振，使快速散射的载波出较低的迷你带。与之前的束缚连续谱设计相比，大的能量分离通过允许来自具有非常小的面内动能的电子的光学声子散射来显着降低较低态的寿命，并减少较低态的热回填。已经使用单等离子体激元和双金属波导进行了设备的处理。激光发射发生在能量为14.9毫电子伏的阈值后，在良好的协议与设计的光子能量。在1.5 mm长的晶体管中，可以观察到高达116 K的低温下的脉冲操作。110 /spl mu/m宽激光脊，HR背面涂层。CW操作是可能的，因为由双金属波导和最高工作温度上升到53 K，在0.75毫米长，70 /spl μ/m宽的激光脊提供的高横向模式限制在窄条。
In this paper we present a new QC THz laser with a design that combines the advantages of the bound-to-continuum approach together with the use of an LO phonon resonance to enable fast scattering of the carriers out of the lower miniband. As compared to the previous bound-to-continuum design the large energy separation significantly reduces the lower state lifetime by allowing optical phonon scattering from electrons with very small in-plane kinetic energy and reduces the thermal backfilling of the lower state. Processing of the devices has been performed using both single plasmon and double metal waveguides. Laser emission takes place at an energy of 14.9 meV just after threshold, in good agreement with the designed photon energy. Pulsed operation could be observed up to an heatsink temperature of 116 K in a 1.5 mm-long. 110 /spl mu/m wide laser ridge with HR backfacet coating. CW operation is possible in narrow stripes because of the high lateral mode confinement provided by the double-metal waveguide and maximum operating temperature rises up to 53 K in a 0.75 mm-long, 70 /spl mu/m wide laser ridge.