Plasmonic array nanoantennas on layered substrates: modeling and radiation characteristics

被引：20

作者：

Ghadarghadr, Shabnam ^{[1
]}

Hao, Zhengwei ^{[1
]}

Mosallaei, Hossein ^{[1
]}

机构：

[1] Northeastern Univ, Electromagnet & Opt Devices Lab, ECE Dept, Boston, MA 02115 USA

来源：

OPTICS EXPRESS | 2009年 / 17卷 / 21期

基金：

美国国家科学基金会;

关键词：

EXCITATION;

D O I：

10.1364/OE.17.018556

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, we theoretically characterize the performance of array of plasmonic core-shell nano-radiators located over layered substrates. Engineered substrates are investigated to manipulate the radiation performance of nanoantennas. A rigorous analytical approach for the problem in hand is developed by applying Green's function analysis of dipoles located above layered materials. It is illustrated that around the electric scattering resonances of the subwavelength spherical particles, each particle can be viewed as an induced electric dipole which is related to the total electric field upon that particle by a polarizability factor. Utilizing this, we can effectively study the physical performance of such structures. The accuracy of our theoretical model is validated through using a full-wave finite difference time domain (FDTD) numerical technique. It is established that by novel arraying of nano-particles and tailoring their multilayer substrates, one can successfully engineer the radiation patterns and beam angles. Several optical nanoantennas designed on layered substrates are explored. Using the FDTD the effect of finite size substrate is also explored. (c) 2009 Optical Society of America

引用

页码：18556 / 18570

页数：15

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