宽带聚合物光波导放大器的制备策略:在聚合物基质中掺杂低晶场对称纳米晶体作为增益介质
A strategy for preparing broadband polymer based optical waveguide amplifiers:doping low crystal field symmetric nanocrystals in polymer matrix as gain media
崔皓 1姜子炫 1杨育 1陶思亮 1吴双 1尹晶 1王菲 1秦冠仕 1孟凡超 1赵丹 1秦伟平1
作者信息
- 1. State Key Laboratory on Integrated Optoelectronics,College of Electronic Science & Engineering,Jilin University,Changchun 130012,China
- 折叠
摘要
光波导放大器是集成光学系统中必不可少的器件.它们的增益带宽直接决定了集成光路的工作波长.以往掺杂Er3+的聚合物光波导放大器只能放大C波段的光信号.为了获得宽带聚合物光波导放大器,我们提出了一种策略:使用具有低晶体场对称性的纳米晶体来实现光波导放大器工作带宽的宽.采用LiYF4∶Yb,Er-PMMA复合聚合物作为增益介质的聚合物波导放大器可以实现整个(C+L)波段和大部分S波段的信号放大.由于LiYF4基质的晶体场对称性较低,Er3+离子的4I13/2和4I15/2能级在晶体场效应作用下发生了强烈的J劈裂,从而实现了Er3+离子的宽带发光.此外,荧光动力学分析证实了Er3+的宽带发光是由于晶体场效应导致的显著能级劈裂、子能级之间的跃迁而引起的.在980 nm激发下,放大器在1535 nm处的相对增益约为12.6 dB,在1480 nm处为7.4 dB,在1610 nm处为3.7 dB.本文成功实现了掺铒的聚合物光波导放大器工作带宽展宽.
Abstract
Optical waveguide amplifiers are essential de-vices in integrated optical systems,with their gain bandwidths directly influencing the operating wavelengths of optical cir-cuits.Previous Er3+-doped polymer optical waveguide ampli-fiers have been limited to amplifying signals within the C-band.To achieve broadband polymer optical waveguide amplification,we propose the use of nanocrystals with low crystal field symmetry to extend the working bandwidth.Our approach utilizes LiYF4∶Yb,Er nanoparticles embedded in poly(methyl methacrylate)as the gain medium,enabling sig-nal amplification from most of the S-band to the whole(C+L)band.The low crystal field symmetry of the LiYF4 host sig-nificantly splits the 4I13/2 and 4I15/2 levels of Er3+ions owing to the crystal field effect,facilitating broadband down-conver-sion luminescence under 980-nm excitation.Furthermore,a fluorescence kinetic analysis confirms that the broadband lu-minescence of Er3+arises from significant energy-level split-ting caused by the crystal field effect.Under 980-nm excitation,the amplifiers exhibited relative gains of approxi-mately 12.6 dB at 1535 nm,7.4 dB at 1480 nm,and 3.7 dB at 1610 nm.The Er3+-doped broadband polymer optical wave-guide amplifier was successfully prepared.
关键词
polymer optical waveguide amplifiers/crystal field effect/crystal field symmetry/energy level splittingKey words
polymer optical waveguide amplifiers/crystal field effect/crystal field symmetry/energy level splitting引用本文复制引用
出版年
2024
NETL
NSTL
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