Flat metasurfaces to focus electromagnetic waves in reflection geometry

被引：281

作者：

Li, Xin ^{[1
,2
]}

Xiao, Shiyi ^{[1
,2
]}

Cai, Bengeng ^{[3
,4
]}

He, Qiong ^{[1
,2
]}

Cui, Tie Jun ^{[3
,4
]}

Zhou, Lei ^{[1
,2
]}

机构：

[1] Fudan Univ, Minist Educ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[2] Fudan Univ, Minist Educ, Key Lab Micro & Nano Photon Struct, Shanghai 200433, Peoples R China

[3] Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Jiangsu, Peoples R China

[4] Southeast Univ, Inst Target Characterist & Identificat, Nanjing 210096, Jiangsu, Peoples R China

来源：

OPTICS LETTERS | 2012年 / 37卷 / 23期

关键词：

NEGATIVE INDEX; SURFACES; LENS;

D O I：

10.1364/OL.37.004940

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We show that a flat metasurface with a parabolic reflection-phase distribution can focus an impinging plane wave to a point image in reflection geometry. Our system is much thinner than conventional geometric-optics devices and does not suffer the energy-loss issues encountered by many metamaterial devices working in transmission geometry. We designed realistic microwave samples and performed near-field scanning experiments to verify the focusing effect. Experimental results are in good agreement with full wave simulations, model calculations, and theoretical analyses. (C) 2012 Optical Society of America

引用

页码：4940 / 4942

页数：3

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