Broadband near total light absorption in non-PT-symmetric waveguide-cavity systems

被引：51

作者：

Huang, Yin ^{[1
,2
]}

Min, Changjun ^{[2
]}

Veronis, Georgios ^{[3
,4
]}

机构：

[1] Cent S Univ, Sch Phys & Elect, Dept Optoelect Informat Sci & Engn, Changsha 410012, Hunan, Peoples R China

[2] Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China

[3] Louisiana State Univ, Sch Elect Engn & Comp Sci, Baton Rouge, LA 70803 USA

[4] Louisiana State Univ, Ctr Computat & Technol, Baton Rouge, LA 70803 USA

来源：

OPTICS EXPRESS | 2016年 / 24卷 / 19期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

SURFACE-PLASMON POLARITONS; GAIN-ASSISTED PROPAGATION; PARITY-TIME SYMMETRY; OPTICAL ISOLATION; ULTRABROADBAND; LAYER;

D O I：

10.1364/OE.24.022219

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We introduce broadband waveguide absorbers with near unity absorption. More specifically, we propose a compact non-parity-time-symmetric perfect absorber unit cell, consisting of two metal-dielectric-metal (MDM) stub resonators with unbalanced gain and loss side-coupled to a MDM waveguide, based on unidirectional reflectionlessness at exceptional points. With proper design, light can transport through the perfect absorber unit cell with reflection close to zero in a broad wavelength range. By cascading multiple unit cell structures, the overall absorption spectra are essentially the superposition of the absorption spectra of the individual perfect absorber unit cells, and absorption of similar to 100% is supported in a wide range of frequencies. (C) 2016 Optical Society of America

引用

页码：22219 / 22231

页数：13

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