Diffraction-Limited Imaging with a Graphene Metalens

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（10）
• 所属期刊栏目: CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES
• 页码范围: 54-60
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/10/106801

摘要

Planar graphene metalens has demonstrated advantages of ultrathin thickness (200 nm),high focusing resolution(343 nm) and efficiency (＞32％) and robust mechanical strength and flexibility.However,diffraction-limited imaging with such a graphene metalens has not been realized,which holds the key to designing practical integrated imaging systems.In this work,the imaging rule for graphene metalenses is first derived and theoretically verified by using the Rayleigh-Sommerfeld diffraction theory to simulate the imaging performance of the 200 nm ultrathin graphene metalens.The imaging rule is applicable to graphene metalenses in different immersion media,including water or oil.Based on the theoretical prediction,high-resolution imaging using the graphene metalens with diffraction-limited resolution (500nm) is demonstrated for the first time.This work opens the possibility for graphene metalenses to be applied in particle tracking,microfluidic chips and biomedical devices.