Gain-assisted light guiding at the subwavelength scale in a hybrid dielectric-loaded surface plasmon polariton waveguide based on a metal nanorod

被引:4
作者
Bian, Yusheng [1 ]
Zheng, Zheng [1 ]
Zhao, Xin [1 ]
Xiao, Jing [1 ]
Liu, Haitao [1 ]
Liu, Jiansheng [1 ]
Zhou, Tao [2 ]
Zhu, Jinsong [3 ]
机构
[1] Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China
[2] New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA
[3] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China
关键词
LOSS COMPENSATION; PROPAGATION; MODES; ENHANCEMENT; INDEX;
D O I
10.1088/0022-3727/46/33/335102
中图分类号
O59 [应用物理学];
学科分类号
摘要
Hybrid dielectric-loaded plasmonic waveguide consisting of an inverted U-shaped high-index ridge covering atop a low-index polymer coated metal nanorod is proposed and numerically investigated. Through incorporating a gain medium either in the ridge or the buffer layer, the loss of the supported plasmonic mode can be effectively compensated. For a typical configuration comprising a 450 nm x 160 nm InGaAsP ridge with a 5-40 nm thick PMMA layer and a 30 nm wide Ag nanorod, the necessary gain required in InGaAsP for lossless propagation of the quasi-TE type symmetric hybrid mode can be as low as 3.45-9.85 cm(-1), along with a subwavelength mode area (lambda(2)/60-lambda(2)/148) attainable simultaneously. The configuration potentially offers a promising solution to enable lossless light transport at the sub-diffraction-limited scale with low compensation gain, thereby opening venues for ultra-compact active plasmonic devices and circuits.
引用
收藏
页数:7
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