Cylindrical Fresnel lenses based on carbon nanotube forests

被引：25

作者：

Butt, Haider ^{[1
]}

Rajesekharan, Ranjith ^{[2
]}

Dai, Qing ^{[1
]}

Sarfraz, Sohab ^{[3
]}

Kumar, R. Vasant ^{[3
]}

Amaratunga, Gehan A. J. ^{[1
,4
]}

Wilkinson, Timothy D. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Engn, Elect Engn Div, Cambridge CB3 0FA, England

[2] Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia

[3] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[4] EPZ, Sri Lanka Inst Nanotechnol SLINTEC, Biyagama, Sri Lanka

来源：

APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 24期

关键词：

METAMATERIALS; ARRAYS;

D O I：

10.1063/1.4772002

中图分类号：

O59 [应用物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The forests of carbon nanotubes have been termed as the darkest man-made materials. Such materials exhibit near-perfect optical absorption (reflectance similar to 0.045%) due to low reflectance and nanoscale surface roughness. We have demonstrated the utilization of these perfectly absorbing forests to produce binary amplitude cylindrical Fresnel lenses. The opaque Fresnel zones are defined by the dark nanotube forests and these lenses display efficient focusing performance at optical wavelengths. Lensing performance was analyzed both computationally and experimentally with good agreement. Such nanostructure based lenses have many potential applications in devices like photovoltaic solar cells. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772002]

引用

页数：4

共 23 条

[1]

FRESNEL LENSES [J].