Quasi-Phase-Matching Method Based on Coupling Compensation for Surface Second-Harmonic Generation in Optical Fiber Nanowire Coupler

被引：7

作者：

Wu, Guang-xing

Chen, Jin-Hui

Li, Dan-Ran

Xu, Fei ^{[1
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Coll Engn & Appl Sci, Nanjing 210093, Jiangsu, Peoples R China

来源：

ACS PHOTONICS | 2018年 / 5卷 / 10期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

second harmonic generation; quasi-phase-matching; optical fiber; nanowire; coupler; HARMONIC-GENERATION; WAVE;

D O I：

10.1021/acsphotonics.8b00786

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Efficient second harmonic generation (SHG) employing quasi-phase-matching (QPM) method based on the spatial modulation of mode intensity has been demonstrated experimentally and theoretically in the optical fiber coupler system for the first time. The theory of coupling compensation is amended to be applicable for practical optical fiber nanowire (OFN) coupler platform even under strong coupling conditions. A unique OFN coupler composed of two suspended parallel 650 nm diameter OFNs is fabricated, and a distinct SHG peak is observed for 1014 nm pump light, which coincides with the calculated results by improved theory. The efficiency of the SHG of the OFN coupler is 4 orders of magnitude larger than that of each individual OFN. Moreover, the polarization extinction ratio of the output SHG in the OFN coupler is as large as 24 dB, which implies that the SHG in the structure has good polarization tunability.

引用

页码：3916 / 3922

页数：13

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