Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators
Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators
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DOI：
10.1063/1.1855394
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发表时间：
2005-03-01
影响因子：
3.2
通讯作者：
Hu, Q
中科院分区：
文献类型：
--
作者：
Kohen, S;Williams, BS;Hu, Q
对用于太赫兹量子级联激光器的电磁波导谐振腔进行了有限元数值模拟和分析。研究了金属-金属和半绝缘(SI)表面等离子体脊波导几何结构。对两种类型的波导进行了模拟和分析：二维波导(本征模计算)，以及二维和三维谐振腔(分别计算无限宽和有限宽波导的小面反射率)。波导模拟将以前的横向一维分析扩展到二维(对于横向和横向维度)，并量化了随着脊线宽度的减小一维近似的崩溃。给出了谐振器的二维和三维模拟，并用于获得小面反射率和输出辐射方向图。对于金属-金属波导结构，这些谐振腔模拟定量地显示了太赫兹小面反射率与有效折射率法预测值的强烈偏差。然而，计算反射率的有效折射率方法仍然适用于SI表面等离子体波导管。(C)2005年美国物理研究所。
Finite-element numerical modeling and analysis of electromagnetic waveguides and resonators used in terahertz quantum cascade lasers are presented. Both metal-metal and semi-insulating (SI) surface-plasmon ridge waveguide geometries were investigated. Simulations and analysis of two types were performed: two-dimensional waveguides (eigenmode calculation), and two- and three-dimensional resonators (facet reflectivity calculation for infinite width and finite width waveguides, respectively). Waveguide simulations extend previous transverse one-dimensional analyses to two dimensions (for the lateral and transverse dimensions), and quantify the breakdown of the one-dimensional approximation as the ridge width is reduced. Resonator simulations in two and three dimensions are presented and are used to obtain facet reflectivities and output radiation patterns. For the metal-metal waveguide structures, these resonator simulations quantitatively show strong deviations for terahertz facet reflectivities from those predicted by the effective index method. However, the effective index method for calculating reflectivities is shown to still be valid for SI surface-plasmon waveguides. (C) 2005 American Institute of Physics.