Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China.
Molecules. 2018 May 31;23(6):1323. doi: 10.3390/molecules23061323.
To study the potential application of metasurfaces in lens technology, we propose a dendritic meta-molecule surface (also referred to as a dendritic metasurface) and realize the focusing effect in the visible spectrum through simulations and experiments. Using asymmetric dendritic structures, this metasurface can achieve distinct broadband anomalous reflection and refraction. When the metasurface is rotated by 180° around the axis, anomalous reflection and refraction in vertically incident optical waves are in opposite directions. Considering this feature, a metasurface is designed to achieve a prominent plate-focusing effect. Samples with a transmission peak of green light at 555 nm, yellow light at 580 nm, and red light at 650 nm were prepared using bottom-up electrochemical deposition, and the focus intensity of approximately 10% and focal length of almost 600 µm were experimentally demonstrated.
为了研究超表面在透镜技术中的潜在应用，我们提出了一种树枝状亚分子表面（也称为树枝状超表面），并通过模拟和实验实现了可见光波段的聚焦效果。利用非对称的树枝状结构，这种超表面可以实现明显的宽带异常反射和折射。当超表面绕 轴旋转 180°时，垂直入射光的异常反射和折射方向相反。考虑到这一特点，设计了一种超表面来实现显著的平板聚焦效果。通过自下而上的电化学沉积制备了具有绿光（555nm）、黄光（580nm）和红光（650nm）透射峰的样品，实验证明其聚焦强度约为 10%，焦距约为 600µm。
