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

页码：139 / 146

页数：8

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