2-Dimensional Microlens Based on Uniformed Plasmonic Pyramid Arrays

As a crucial optical element, many different kinds of microlens have been proposed and studied. In this paper, a 2-dimensional microlens has been achieved based on direct bending of wavefront. With only 25 elements, the microlens can achieve subwavelength imaging in a 2-dimensional case. Focusing pattern and sensitivity of object movement have been studied. The physical picture for focusing and imaging has been explained by the help of a Gauss dipole model. Current study can broaden the basic understanding on light-matter interaction and optical element design.