Design of random and sparse metalens with matrix pencil method

作者：Li, Mengmeng; Li, Shuaishuai; Yu, Yefeng; Ni, Xingjie; Chen, Rushan^*

来源：Optics Express, 2018, 26(19): 24702-24711.

DOI：10.1364/OE.26.024702

• CHARACTERISTIC MODE ANALYSIS
• BAND ACHROMATIC METALENS
• DIELECTRIC METASURFACE
• VISIBLE WAVELENGTHS
• HIGH-TRANSMISSION
• LIGHT
• PHASE
• METAMATERIALS
• EFFICIENCY
• RESOLUTION

We propose a matrix pencil method for designing one- or two- dimensional (1D or 2D) metalenses with randomly distributed meta-atoms. In contrast to the standard random synthesis algorithm that only randomizes the position of the meta-atoms, the proposed method designs both the position and phase of each meta-atom rigorously. Several all-dielectric random metalenses, in both 1D and 2D operating at 220 GHz, are presented by using our proposed algorithm. Minimum reduction of focusing efficiency can be achieved with respect to a standard metalens with periodically arranged meta-atoms. In contrast to previously reported random metalenses, our random metalenses achieve much higher efficiency, while staying polarization-independent. This synthesis method will pave a way for future random-metasurface-based device designs, which could have more degrees of freedom to information multiplexing.

• 出版日期2018-9-17
• 单位南京理工大学