Amplitude and Phase Control of Guided Modes Excitation from a Single Dipole Source: Engineering Far‐ and Near‐Field Directionality,Laser & Photonics Reviews

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Amplitude and Phase Control of Guided Modes Excitation from a Single Dipole Source: Engineering Far‐ and Near‐Field Directionality
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2019-11-13 , DOI: 10.1002/lpor.201900250
Michela F. Picardi ₁ , Anatoly V. Zayats ₁ , Francisco J. Rodríguez‐Fortuño ₁

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The design of far‐field radiation diagrams from combined electric and magnetic dipolar sources has recently found applications in nanophotonic metasurfaces that realize tailored reflection and refraction. Such dipolar sources also exhibit important near‐field evanescent coupling properties with applications in polarimetry and quantum optics. Here, a rigorous theoretical framework is introduced for engineering the angular spectra encompassing both far‐ and near‐fields of electric and magnetic sources and a unified description of both free space and guided mode directional radiation is developed. The approach uses the full parametric space of six complex‐valued components of magnetic and electric dipoles in order to engineer constructive or destructive near‐field interference. Such dipolar sources can be realized with dielectric or plasmonic nanoparticles. It is shown how a single dipolar source can be designed to achieve the selective coupling to multiple waveguide modes and far‐field simultaneously with a desired amplitude, phase, and direction.

中文翻译：

单个偶极子源引导模式激励的幅度和相位控制：工程远场和近场方向性

由电和磁偶极子源组合而成的远场辐射图的设计最近在纳米光子超表面中得到了应用，这些表面实现了量身定制的反射和折射。此类偶极辐射源还表现出重要的近场e逝耦合特性，并在偏振计和量子光学中得到应用。在这里，引入了严格的理论框架来工程化涵盖电和磁源的远场和近场的角谱，并开发了自由空间和导模定向辐射的统一描述。该方法使用了磁偶极子和电偶极子的六个复数值分量的完整参数空间，以设计相长或相消近场干扰。这样的偶极源可以用介电或等离子体纳米颗粒来实现。它显示了如何设计单个偶极子源，以实现具有所需幅度，相位和方向的同时耦合到多个波导模式和远场的选择性耦合。

更新日期：2019-11-13

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