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Two-Dimensional Multimode Terahertz Random Lasing with Metal Pillars
ACS Photonics ( IF 6.5 ) Pub Date : 2018-06-13 00:00:00 , DOI: 10.1021/acsphotonics.8b00260 Yongquan Zeng 1 , Guozhen Liang 1 , Bo Qiang 1 , Kedi Wu 1 , Jing Tao 1 , Xiaonan Hu 1 , Lianhe Li 2 , Alexander Giles Davies 2 , Edmund Harold Linfield 2 , Hou Kun Liang 3 , Ying Zhang 3 , Yidong Chong 4 , Qi Jie Wang 1, 4
ACS Photonics ( IF 6.5 ) Pub Date : 2018-06-13 00:00:00 , DOI: 10.1021/acsphotonics.8b00260 Yongquan Zeng 1 , Guozhen Liang 1 , Bo Qiang 1 , Kedi Wu 1 , Jing Tao 1 , Xiaonan Hu 1 , Lianhe Li 2 , Alexander Giles Davies 2 , Edmund Harold Linfield 2 , Hou Kun Liang 3 , Ying Zhang 3 , Yidong Chong 4 , Qi Jie Wang 1, 4
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Random lasers employing multiple scattering and interference processes in highly disordered media have been studied for several decades. However, it remains a challenge to achieve a broadband multimode random laser with high scattering efficiency, particularly at long wavelengths. Here, we develop a new class of strongly multimode random lasers in the terahertz (THz) frequency range in which optical feedback is provided by multiple scattering from metal pillars embedded in a quantum cascade (QC) gain medium. Compared with the dielectric pillars or air hole approaches used in previous random lasers, metal pillars provide high scattering efficiency over a broader range of frequencies and with low ohmic losses. Complex emission spectra are observed with over 25 emission peaks across a 0.4 THz frequency range, limited primarily by the gain bandwidth of the QC wafer employed. The experimental results are corroborated by numerical simulations that show the lasing modes are strongly localized.
中文翻译：
带有金属支柱的二维多模太赫兹随机激光
在高度无序的介质中采用多次散射和干涉过程的随机激光器已经研究了数十年。然而，实现具有高散射效率，特别是在长波长下具有高散射效率的宽带多模随机激光器仍然是一个挑战。在这里，我们开发了一种新型的强太模随机激光器，其频率范围为太赫兹（THz），其中通过嵌入量子级联（QC）增益介质中的金属柱的多次散射提供光反馈。与以前的随机激光器中使用的电介质柱或气孔方法相比，金属柱可在更宽的频率范围内提供高散射效率，并且欧姆损耗低。观察到复杂的发射光谱，在0.4 THz频率范围内有超过25个发射峰，主要受所用QC晶片的增益带宽限制。通过数值模拟证实了实验结果，该数值模拟表明激光模式被强烈地局域化。
更新日期：2018-06-13
中文翻译：
带有金属支柱的二维多模太赫兹随机激光
在高度无序的介质中采用多次散射和干涉过程的随机激光器已经研究了数十年。然而，实现具有高散射效率，特别是在长波长下具有高散射效率的宽带多模随机激光器仍然是一个挑战。在这里，我们开发了一种新型的强太模随机激光器，其频率范围为太赫兹（THz），其中通过嵌入量子级联（QC）增益介质中的金属柱的多次散射提供光反馈。与以前的随机激光器中使用的电介质柱或气孔方法相比，金属柱可在更宽的频率范围内提供高散射效率，并且欧姆损耗低。观察到复杂的发射光谱，在0.4 THz频率范围内有超过25个发射峰，主要受所用QC晶片的增益带宽限制。通过数值模拟证实了实验结果，该数值模拟表明激光模式被强烈地局域化。
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