Highly efficient coupler for dielectric slot waveguides and hybrid plasmonic waveguides

被引：3
作者：
Yu, Jiyao [1 ]
Ohtera, Yasuo [1 ]
Yamada, Hirohito [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808579, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2018年 / 57卷 / 05期
关键词：
BRAGG GRATINGS; LIGHT; PROPAGATION; PERFORMANCE; POLARITONS; MODES;
D O I：
10.7567/JJAP.57.052202
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A compact, highly efficient optical coupler for dielectric slot waveguides and hybrid plasmonic waveguides based on transition layers (air slot grooves) was investigated. The power-coupling efficiency of 75% for the direct coupling case increased to 90% following the insertion of an intermediate section. By performing time-averaged Poynting vector analysis, we successfully separated the factors of transmission, reflection, and radiation at the coupler interface. We found that the insertion of optimal air grooves into the coupler structure contributed to the improvement of coupling performance. The proposed compact structure is characterized by a high transmission efficiency, low reflection, small length, and broad-band spectrum response. (C) 2018 The Japan Society of Applied Physics
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页数：6
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