应用于微型成像的氮化镓超透镜设计

金鑫; 王淼; 周桃飞; 曹冰

doi:10.3788/OPE.20182612.2917

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应用于微型成像的氮化镓超透镜设计

现代应用光学 | 更新时间：2020-07-05

- 应用于微型成像的氮化镓超透镜设计
- GaN based metalens for micro imaging
- 光学精密工程 2018年26卷第12期页码：2917-2922
- 作者机构：
  
  1.苏州大学光电科学与工程学院, 江苏苏州 215006
  2.中国科学院苏州纳米技术与纳米仿生研究所, 江苏苏州 215215
- 作者简介：
  
  [ "金鑫(1994-), 男, 江苏盐城人, 硕士研究生, 2016年于苏州大学获得学士学位, 主要从事微纳结构的研究。E-mail:1207990662@qq.com" ]
- 基金信息：
  
  国家重点研发计划资助项目(2017YFB0403002);江苏省自然科学基金资助项目(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(61574097)
- DOI：10.3788/OPE.20182612.2917
  中图分类号： O436.1;TH74
- 收稿日期：2018-06-21，
  
  录用日期：2018-7-25，
  
  纸质出版日期：2018-12-25
- 稿件说明：
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金鑫, 王淼, 周桃飞, 等. 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.

Xin JIN, Miao WANG, Tao-fei ZHOU, et al. GaN based metalens for micro imaging[J]. Optics and precision engineering, 2018, 26(12): 2917-2922.
金鑫, 王淼, 周桃飞, 等. 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. DOI： 10.3788/OPE.20182612.2917.

Xin JIN, Miao WANG, Tao-fei ZHOU, et al. GaN based metalens for micro imaging[J]. Optics and precision engineering, 2018, 26(12): 2917-2922. DOI： 10.3788/OPE.20182612.2917.

摘要

为了实现可见光入射时亚波长尺度内的聚焦，设计了以氮化镓（GaN）纳米柱为基本晶胞的超透镜，该透镜能够改进传统成像系统的笨重低效，可应用于微型成像系统。超透镜表面由宽度渐变高度不变的GaN纳米柱阵列构成，分析GaN在亚波长尺度内对相位的调控能力和机理，并基于时域有限差分法模拟仿真了在蓝光波长为460 nm入射时透射场的高效率聚焦，对比超透镜尺寸为3.75

m×3.75

m、6.75

m×6.75

m、8.75

m×8.75

m、10.75

m×10.75

m时超透镜的聚焦能力，得出聚焦后透射场焦点处的半峰全宽分别为1，0.8，0.5，0.3

m，给出了强度分布、聚焦光斑等仿真模拟结果，发现实际焦距与设计值存在偏差，且随超透镜尺寸的变化而变化。文中所设计的超透镜能够在微米级别实现聚焦，有效降低了传统成像系统的复杂度。

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 3.75

m×3.75 m

6.75

m×6.75 m

8.75

m×8.75 m

and 10.75

m×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 of metalens. In conclusion

the designed GaN based metalens can focus in micron dimension effectively

which reduces the complexity of traditional imaging systems.

关键词

Keywords

references

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