Visible light focusing flat lenses based on hybrid dielectric-metal metasurface reflector-arrays

被引：49
作者：
Fan, Qingbin [1 ,2 ]
Huo, Pengcheng [1 ,2 ]
Wang, Daopeng [1 ,2 ]
Liang, Yuzhang [1 ,2 ]
Yan, Feng [3 ]
Xu, Ting [1 ,2 ]
机构：
[1] Nanjing Univ, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, 22 Hankou Rd, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, 22 Hankou Rd, Nanjing 210093, Peoples R China
[3] Nanjing Univ, Sch Elect Sci & Engn, 22 Hankou Rd, Nanjing 210093, Peoples R China
来源：
SCIENTIFIC REPORTS | 2017年 / 7卷
基金：
中国国家自然科学基金;
关键词：
BROAD-BAND;
D O I：
10.1038/srep45044
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Conventional metasurface reflector-arrays based on metallic resonant nanoantenna to control the wavefront of light for focusing always suffer from strong ohmic loss at optical frequencies. Here, we overcome this challenge by constructing a non-resonant, hybrid dielectric-metal configuration consisting of TiO2 nanofins associated with an Ag reflector substrate that provides a broadband response and high polarization conversion efficiency in the visible range. A reflective flat lens based on this configuration shows an excellent focusing performance with the spot size close to the diffraction limit. Furthermore, by employing the superimposed phase distribution design to manipulate the wavefront of the reflected light, various functionalities, such as multifocal and achromatic focusing, are demonstrated for the flat lenses. Such a reflective flat lens will find various applications in visible light imaging and sensing systems.
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页数：9
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