Engineering the Losses and Beam Divergence in Arrays of Patch Antenna Microcavities for Terahertz Sources
Engineering the Losses and Beam Divergence in Arrays of Patch Antenna Microcavities for Terahertz Sources
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DOI：
10.1007/s10762-017-0418-6
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
J. Madéo;J. Pérez-Urquizo;Y. Todorov;C. Sirtori;K. Dani
中科院分区：
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作者：
J. Madéo;J. Pérez-Urquizo;Y. Todorov;C. Sirtori;K. Dani
我们进行了全面的研究，从有限阵列的贴片天线微腔设计的太赫兹范围内，通过使用有限元方法的发射。的发射特性，包括品质因数，远场图案，和光子提取效率的蚀刻和非蚀刻的结构作为谐振器的数量的函数，介质层的厚度，和阵列的周期进行了研究。此外，模拟实现了有损耗和完美的金属和介电层，允许提取的辐射和非辐射的贡献阵列的总品质因数。我们的研究表明，这种结构可以优化，以获得低光束发散度（半高宽<10°）和光子提取效率>50%，同时保持强局域模式。这些结果表明，使用这些微腔将导致具有低发散垂直发射和工程损耗的高效太赫兹发射器。
We perform a comprehensive study on the emission from finite arrays of patch antenna microcavities designed for the terahertz range by using a finite element method. The emission properties including quality factors, far-field pattern, and photon extraction efficiency are investigated for etched and non-etched structures as a function of the number of resonators, the dielectric layer thickness, and period of the array. In addition, the simulations are achieved for lossy and perfect metals and dielectric layers, allowing to extract the radiative and non-radiative contributions to the total quality factors of the arrays. Our study shows that this structure can be optimized to obtain low beam divergence (FWHM <10°) and photon extraction efficiencies >50% while keeping a strongly localized mode. These results show that the use of these microcavities would lead to efficient terahertz emitters with a low divergence vertical emission and engineered losses.