腔基太赫兹光导天线的扩展光谱响应与量子级联激光器的相干探测

IF 6.6 2区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Anna De Vetter, James Normansell, José Palomo, Martin Mičica, Li Chen, Juliette Mangeney, Jerome Tignon, Lianhe H. Li, Alexander Giles Davies, Edmund H. Linfield, Joshua R. Freeman, Sukhdeep S. Dhillon
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引用次数: 0

摘要

相干超快探测已经成为研究太赫兹(THz)量子级联激光器(qcl)时间响应的重要方法,可以深入了解这些复杂结构中模型锁定和频率梳操作的动力学。相干检测通常是基于非线性晶体和电光采样的使用,这对在高太赫兹频率下工作的qcl不太敏感。这是因为由于相位匹配条件,它们的响应随频率迅速下降。在这里,我们开发了基于垂直四分之一波长腔中太赫兹光导天线的相干检测,在那里我们可以自由地设计光谱响应,以增强频率大于2太赫兹的太赫兹检测。我们开发了厚的低温生长GaAs,将其转移到聚合物和金属涂层基板上,以创建具有超过非腔探测器响应的太赫兹响应的腔。这种垂直太赫兹腔也允许独立设计平面电极几何形状。事实上,我们表明太赫兹腔可以与大表面积的单接触电极结合,以进一步提高光谱响应。虽然这种原理验证相干探测没有完全优化,但它被用于相干地解析工作在3thz的双金属太赫兹QCL的时间响应。这种方法为调整太赫兹光导天线的响应并在所需频率上增强其频谱响应开辟了前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Extended spectral response of cavity-based terahertz photoconductive antennas and coherent detection of quantum cascade lasers
Coherent ultrafast detection has become an important method to study the temporal response of terahertz (THz) quantum cascade lasers (QCLs), bringing insights into the dynamics of modelocking and frequency comb operation in these complex structures. Coherent detection has been typically based on the use of nonlinear crystals and electro-optic sampling, which are less sensitive to QCLs operating at high THz frequencies. This is because their response drops rapidly with frequency owing to phase matching conditions. Here, we develop coherent detection based on THz photoconductive antennas in vertical quarter-wavelength cavities, where we can freely engineer the spectral response to enhance the THz detection at frequencies greater than 2 THz. We develop thick low temperature grown GaAs that is transferred onto polymer and metal coated substrates to create a cavity with an THz response that exceeds the response of non-cavity detectors. This vertical THz cavity also permits the planar electrode geometry to be designed independently. Indeed, we show that the THz cavity can be combined with large surface area single contact electrodes to further enhance the spectral response. Although this proof-of-principle coherent detection is not fully optimised, it is used to coherently resolve the temporal response of a double-metal THz QCL operating at 3 THz. This approach opens up perspectives to tune the response of THz photoconductive antennas and enhance their spectral response at a desired frequency.
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来源期刊
Nanophotonics
Nanophotonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
13.50
自引率
6.70%
发文量
358
审稿时长
7 weeks
期刊介绍: Nanophotonics, published in collaboration with Sciencewise, is a prestigious journal that showcases recent international research results, notable advancements in the field, and innovative applications. It is regarded as one of the leading publications in the realm of nanophotonics and encompasses a range of article types including research articles, selectively invited reviews, letters, and perspectives. The journal specifically delves into the study of photon interaction with nano-structures, such as carbon nano-tubes, nano metal particles, nano crystals, semiconductor nano dots, photonic crystals, tissue, and DNA. It offers comprehensive coverage of the most up-to-date discoveries, making it an essential resource for physicists, engineers, and material scientists.
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