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首页> 外文期刊>Journal of Applied Physics >Modal characteristics of terahertz surface-emitting distributed-feedback lasers with a second-order concentric-circular metal grating
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Modal characteristics of terahertz surface-emitting distributed-feedback lasers with a second-order concentric-circular metal grating

机译：具有二阶同心圆金属光栅的太赫兹面发射分布式反馈激光器的模态特性

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摘要

A theoretical model is developed to study the modal characteristics of a second-order concentric-circular metal grating surface-emitting distributed-feedback (DFB) laser operating at terahertz regime. A series of high-order diffracted fields, which can be expressed as a Floquet-Bloch expansion of Hankel functions, is assumed to be generated from the concentric-circular metal grating. The resonant frequencies and transverse profiles of all the diffracted fields can be deduced from the related eigenequations established through the boundary conditions of the interfaces of the metal-dielectric-metal waveguide. The results show that the interference of the diffracted cylindrical waves can form two types of resonant modes, namely, quasisymmetric and quasiantisymmetric modes. Surface radiation is excited mainly by the influence of quasisymmetric modes, which exhibit constructive interference with the grating geometry. Furthermore, the resultant intensities of the diffracted waves decay exponentially from the center of the circular grating, indicating that the proposed grating geometry has the potential to realize surface terahertz radiation with excellent beam quality. The influence of grating duty cycle on the resonant conditions and transverse distributions of the diffracted fields are also investigated.
机译：建立了理论模型来研究以太赫兹频率工作的二阶同心圆金属光栅表面发射分布式反馈（DFB）激光器的模态特性。假设从同心圆金属光栅产生一系列高阶衍射场，可以表示为汉克尔函数的Floquet-Bloch展开。可以从通过金属-电介质-金属波导的界面的边界条件建立的相关本征方程推导出所有衍射场的谐振频率和横向轮廓。结果表明，绕射的圆柱波的干涉可以形成两种类型的共振模式，即准对称模式和准反对称模式。表面辐射主要是由准对称模式的影响激发的，准对称模式对光栅的几何形状表现出相长干涉。此外，衍射波的合成强度从圆形光栅的中心呈指数衰减，这表明所提出的光栅几何形状具有实现具有优异光束质量的表面太赫兹辐射的潜力。还研究了光栅占空比对共振条件和衍射场横向分布的影响。

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  • 来源
    《Journal of Applied Physics》 |2009年第5期|053103.1-053103.11|共11页
  • 作者

    X. F. Li; S. F. Yu;

  • 作者单位

    School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;

    School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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