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应用科学学报 >

2018 , Vol. 36 >Issue 5: 748 - 755

DOI: https://doi.org/10.3969/j.issn.0255-8297.2018.05.002

光纤传感技术

石墨烯/金复合薄膜微纳光纤集成光控波导

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  • 1. 武汉理工大学 光纤传感国家工程实验室, 武汉 430070;
    2. 武汉理工大学 材料科学与工程学院, 武汉 430070

收稿日期: 2017-03-16

  修回日期: 2017-04-21

  网络出版日期: 2018-09-30

基金资助

国家自然科学基金（No.11204224，No.11204047）；湖北省自然科学基金（No.2015CFB226）资助

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Graphene/Au Thin Film Coupled Microfiber All-Optical Modulator

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  • 1. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China;
    2. Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Received date: 2017-03-16

  Revised date: 2017-04-21

  Online published: 2018-09-30

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摘要

设计并制作了一种具有微纳光纤、石墨烯/金复合薄膜、聚二甲基硅氧烷（polydimethylsiloxane，PDMS）三明治结构的光波导.由于石墨烯/金薄膜保持了平面形态，该光波导表现出很强的光学偏振和可饱和吸收特性.金膜在限制光波导表面倏逝场的同时，增强了倏逝场与石墨烯的相互作用.实验结果表明，微纳光纤光波导中的两种相互垂直的偏振模式（P和S偏振模式）在1 550 nm波长处的消光比可达42.3 dB；由于S偏振模式的光与石墨烯相互作用更强，使用S偏振模式的泵浦光进行光调制特性研究可进一步提高光场能量的利用效率.当980 nm泵浦光能量为130 mW时，信号光强度的调制深度达41.3 dB，信号光的3 dB和10 dB调制对应的泵浦光功率分别为2.8 mW和5.6 mW.

关键词： 微纳光纤; 金膜; 光波导; 石墨烯; 可饱和吸收; 偏振

本文引用格式

李钦友, 周爱, 郭东来 . 石墨烯/金复合薄膜微纳光纤集成光控波导[J]. 应用科学学报, 2018 , 36(5) : 748 -755 . DOI: 10.3969/j.issn.0255-8297.2018.05.002

Abstract

An all-optical modulator is fabricated with sandwich structure of graphene/Au thin film coupled microfiber. The whole structure is sealed by polydimethylsiloxane (PDMS). The Au film can confine the evanescent field and enhance the interaction between evanescent field and graphene. This device exhibits strong optical polarization and saturation absorption effect, resulting in a polarization extinction ratio of up to 42.3 dB at 1 550 nm. Because the S-polarization light exhibits more intensive interaction with graphene, the modulation effect can be enhanced when pump and signal both are in S-polarization. The experimental result shows that a high modulation amplitude of 41.0 dB can be reached with a 130 mW pump light at 980 nm, whereas the 3 dB and 10 dB modulation amplitudes correspond to pump lights of 2.8 mW and 5.6 mW, respectively.

Key words： polarization; saturable absorption; Au film; optical waveguide; microfiber; graphene

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