2D-Broadband Metasurface Unicells Dataset for Predicting Optimum Structures for Tandem Solar Cells

2D images of metasurface unit cell shapes and their design parameters. The geometry of the resonator was cross, square, L-shaped, window-shaped polygon and their inverted version. The shapes were chosen because of the ease of fabrication by the lithography technique. The 2D-array images of these metasurfaces were generated in MATLAB. The mesh step size of 100nm was maintained in all three dimensions. Periodic boundary conditions were applied in x and y dimensions while PML condition was applied on the z-axis to absorb/ transmit maximum light with minimum reflection. Each shape was converted into a greyscale 40 x 40 x 1-pixel image. Each pixel contains the minimum feature size of 80nm which lies within the fabrication range.

本数据集包含超表面(metasurface)单元胞结构的二维图像及其对应的设计参数。该数据集所涉及的谐振器几何构型包括十字形、正方形、L形、窗形多边形及其反向结构。选择此类结构的初衷在于其可通过光刻工艺便捷实现加工制备。上述超表面的二维阵列图像均通过MATLAB软件生成。所有三维方向均采用100nm的网格步长。x、y维度采用周期性边界条件，z轴则应用完美匹配层(PML)条件，以在最小反射的前提下实现最大程度的光吸收与透射。每种结构均被转换为尺寸为40×40×1像素的灰度图像。每个像素对应的最小特征尺寸为80nm，该尺寸处于当前可实现的加工工艺范围之内。