Subwavelength focusing by optical surface transformation

被引：6
|
作者：
Sun, Fei [1 ,2 ,3 ]
He, Sailing [1 ,2 ,3 ,4 ]
机构：
[1] Zhejiang Univ, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, JORCEP, Hangzhou 310058, Zhejiang, Peoples R China
[2] Zhejiang Univ, Natl Engn Res Ctr Opt Instrumentat, Hangzhou 310058, Zhejiang, Peoples R China
[3] Zhejiang Univ, Zhejiang Prov Key Lab Sensing Technol, Hangzhou 310058, Zhejiang, Peoples R China
[4] Royal Inst Technol KTH, Sch Elect Engn, Dept Electromagnet Engn, S-10044 Stockholm, Sweden
来源：
OPTICS COMMUNICATIONS | 2018年 / 427卷
基金：
中国国家自然科学基金;
关键词：
Optical surface transformation; Sub-wavelength focusing; Optic-null medium; NULL MEDIUM; EXTRAORDINARY TRANSMISSION; NEGATIVE-INDEX; LIGHT; CONCENTRATORS; METAMATERIAL; DIFFRACTION; REALIZATION; PLASMONICS; DESIGN;
D O I：
10.1016/j.optcom.2018.06.029
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose a novel beam-compression device to achieve sub-wavelength focusing (SF) by optical surface transformation (a new theoretical branch derived from transformation optics). When a Gaussian beam is incident on the input surface of our device, we can obtain a sub-wavelength focused spot at the output surface of the compression device. The focused mode can still propagate to the far-field and keep very good directivity as incident Gaussian beam. The size of the sub-wavelength beam can be tuned by changing the size of the output surface. We only need one kind of homogeneous anisotropic medium, the optic-null medium (ONM), to realize the proposed beam-compression device. After some simplifications, we design a layered structure of two isotropic homogeneous media to realize the device. Numerical simulations verify the performance of our beam-compression device.
引用
收藏
页码：139 / 146
页数：8
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