光学精密工程2018，Vol.26Issue(12)：2917-2922,6.DOI:10.3788/OPE.20182612.2917
应用于微型成像的氮化镓超透镜设计
GaN based metalens for micro imaging
摘要
Abstract
A metalens consisting of GaN nanopillars as basic cells was designed for subwavelength focusing at visible wavelengths, which provided an improvement over bulky and low-efficiency conventional imaging systems, and the possibility of its application to micro imaging.The metalens is composed of a GaN nanopillar array, which maintains the same height but gradually varying width.An analysis of the capacity and reasons for GaN nanopillars controlling the phase of incoming light was performed.In addition, based on FDTD methods, a simulation of 460 nm wavelength focusing in the transmission mode was performed.Subsequently, full width at half maximum (FWHM) are shown when the sizes of metalens are 3.75μm×3.75 m, 6.75μm×6.75 m, 8.75μm×8.75 m, and 10.75μm×10.75 m, and the results are 1, 0.8, 0.5, and 0.3 m, respectively.The other focusing results, such as intensity distribution and focus spots, were also discussed.As a result, there are differences between designed focal length and simulated focal length, which changes under the different sizes ofmetalens.In conclusion, the designed GaN based metalens can focus in micron dimension effectively, which reduces the complexity of traditional imaging systems.关键词
超透镜/亚波长聚焦/GaN/时域有限差分仿真Key words
metalens/subwavelength focusing/GaN/finite-difference time-domain simulation分类
数理科学引用本文复制引用
金鑫,王淼,周桃飞,曹冰,张桂菊..应用于微型成像的氮化镓超透镜设计[J].光学精密工程,2018,26(12):2917-2922,6.基金项目
国家重点研发计划资助项目(No.2017YFB0403002) （No.2017YFB0403002）
江苏省自然科学基金资助项目(No.BK20150308) （No.BK20150308）
江苏高校优势学科建设工程资助项目 （）
国家自然科学基金资助项目(No.61574097) （No.61574097）
