Extraordinary Optical Transmission Coupled to A Gain Medium Based on The Subwavelength Nanostructure

被引：0
|
作者：
Sun L. [1 ,2 ,3 ]
Niu K.-K. [4 ]
Feng D.-Z. [1 ,2 ]
Wang S.-Y. [1 ,5 ]
Xing M.-D. [1 ,2 ]
机构：
[1] National Lab of Radar Signal Processing, Xidian University, Xi'an
[2] Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi'an
[3] No.38 Research Institute, CETC, Hefei
[4] Key Lab of Intelligent Computing & Signal Processing, Ministry of Education, Anhui University, Hefei
[5] School of Technical Physics, Xidian University, Xi'an
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2019年 / 40卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Extraordinary optical transmission; Finite-difference time-domain(FDTD) method; Gain material;
D O I：
10.3788/fgxb20194003.0366
中图分类号：
学科分类号：
摘要：
As a focus on the study of metamaterials, the gain medium attracts a wide range of attention due to its excellent amplification characteristics. However, high external energy is needed to excite the gain material to compensate loss or create laser, which greatly limits the practical application of the gain materials. We investigate a computational scheme allowing for a self-consistent treatment of periodic arrays of subwavelength apertures coupled to a gain material incorporated into the nanostructure. Taking advantage of the amplification of extraordinary optical transmission(EOT) phenomena, the resonant electric-field intensity is enhanced associated with the effect of surface plasmon polariton(SPP). We present a simulation framework allowing for EOT coupled to gain media, which enables complete Ohmic loss compensation by using a moderate pump intensity level. The active gain media is represented with four-level atomic system by solving the semiclassical electronic rate equations. Finite-difference time-domain (FDTD) method incorporated with auxiliary differential equation is used to simulate electromagnetic field. Our results can be used as instruction for the realistic experiments, and provide a deep insight into the interaction between nanostructure and gain materials. © 2019, Science Press. All right reserved.
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页码：366 / 373
页数：7
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