We propose two types of intelligent reflecting systems based on programmable metasurfaces and mirrors to focus the incident optical power towards a visible light communication receiver. We derive the required phase gradients for the metasurface array reflector and the required orientations of each mirror in the mirrors array reflector to achieve power focusing. Based on which, we derive the irradiance expressions for the two systems in the detector plane to characterize their performance in terms of aiming and focusing capabilities. We show analytically that the number of reflecting elements along with the relative source - reflector dimensions determine the system power focusing capability. Moreover, we quantify analytically the received power gain compared with reflector-free systems. In addition, we introduce a new simple metric to assess the relative reflectors’ performance for a given source, detector, reflector layout. Finally, we verify the analytical findings regarding absolute and relative reflectors’ performance via numerical simulations.

中文翻译：

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通过智能反射表面的可见光通信：超表面与反射镜阵列

我们提出了两种基于可编程超表面和反射镜的智能反射系统，以将入射光功率聚焦到可见光通信接收器上。我们导出超颖表面阵列反射器所需的相位梯度以及反射镜阵列反射器中每个反射镜的所需方向，以实现功率聚焦。基于此，我们得出两个系统在探测器平面上的辐照度表达式，以根据瞄准和聚焦能力来表征其性能。我们通过分析表明，反射元件的数量以及相对的源-反射器尺寸决定了系统功率聚焦能力。此外，与无反射器的系统相比，我们可以分析地量化接收到的功率增益。此外，我们引入了一个新的简单度量来评估给定源，探测器，反射器布局的相对反射器性能。最后，我们通过数值模拟验证了有关绝对和相对反射器性能的分析结果。