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首页> 外文会议>2017 Conference on Lasers and Electro-Optics Europe amp; European Quantum Electronics Conference >Phase-front shaping of extended beams in waveguide arrays
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Phase-front shaping of extended beams in waveguide arrays

机译：波导阵列中扩展光束的相前整形

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Summary form only given. Coupled waveguide arrays lend themselves very well to photonic engineering through tailoring of the propagation and coupling constants [1]. Especially interesting is the manipulation of collective Floquet Bloch waves (extended beams see Figure 1 top, a and d) that propagate over several waveguides through evanescent coupling and their manipulation for classical and quantum data processing. Phase-front shaping of these waves is crucial for compact imaging and photonic circuitry in the classical and quantum regime up to multiqbit architectures where phase-shifters are instrumental [2]. Segmentation of a waveguide enables a change of its propagation constant [3] and thus segmentation patterns can shape the phase front of a beam. Image reconstruction has indeed been demonstrated using π shifts [4]. We demonstrate here complete phase-front shaping in waveguide arrays by means of more general segmented patterns for a novel imaging approach. We implement three emblematic functions related to three phase profiles in III-V waveguide arrays: beam steering (linear wedge-profile), focusing and defocusing (quadratic lens-like profile) and diffraction (cosine profile). We evaluate the operation of those patterns by measuring maps of the output intensity profile as a function of the position of injection (xinjection=0 corresponds to the center of the patterns). The experimental maps clearly exhibit the desired effects (see Figure 1 for steering and focusing). The excellent agreement between the simulation and the experiment validates the concept of extensive phase front shaping via segmentation patterns, the fabrication and our capacity to design and fabricate more complex functions.
机译：仅提供摘要表格。耦合波导阵列通过调整传播常数和耦合常数，非常适合光子工程[1]。特别有趣的是通过瞬逝耦合在多个波导上传播的集体Floquet Bloch波（扩展光束，见图1顶部，a和d）的操纵及其对经典和量子数据处理的操纵。这些波的相位前整形对于经典的和量子状态下的紧凑型成像和光子电路以及使用移相器的多qbit架构至关重要[2]。波导的分段可以改变其传播常数[3]，因此分段图案可以使光束的相位前锋成形。确实已经使用π位移证明了图像重建[4]。我们在这里通过更一般的分段图案展示一种新颖的成像方法，从而在波导阵列中完成了完整的相前整形。我们实现了与III-V波导阵列中的三个相位轮廓相关的三个标志性功能：光束转向（线性楔形轮廓），聚焦和散焦（二次透镜状轮廓）和衍射（余弦轮廓）。我们通过测量输出强度分布图作为注入位置的函数来评估这些模式的操作（x injection = 0对应于模式的中心）。实验图清楚地显示了所需的效果（有关转向和聚焦，请参见图1）。仿真与实验之间的出色一致性验证了通过分割图案，制造以及我们设计和制造更复杂功能的能力进行广泛的相前整形的概念。

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