二维 Bi2TexSe3-x 纳米片中的超宽带非线性饱和吸收

Ultra-broadband Nonlinear Saturable Absorption for Two-dimensional Bi2TexSe3-x Nanosheets.

机构信息

School of Physics and Electronics, Hunan Key Laboratory for Super-micro structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China.

出版信息

Sci Rep. 2016 Sep 9;6:33070. doi: 10.1038/srep33070.

DOI:10.1038/srep33070

PMID:27609149

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5016803/

Abstract

We report the ultra-broadband nonlinear optical (NLO) response of Bi2TexSe3-x nanosheets produced by a facile solvothermal method. Our result show that the extracted basic optical nonlinearity parameters of Bi2TexSe3-x nanosheets, αNL, Imχ((3)), and FOM reach ~10(4) cm/GW, ~10(-8) esu and ~10(-13) esu cm, respectively, which are several orders of magnitude larger than those of bulk dielectrics. We further observed the excitation intensity dependence of the NLO absorption coefficient and the NLO response sensitivity. The mechanisms of those phenomena were proposed based on physical model. The wavelength dependence of the NLO response of Bi2TexSe3-x nanosheets was investigated, and we determined that the Bi2TexSe3-x nanosheets possess an ultra-broadband nonlinear saturable absorption property covering a range from the visible to the near-infrared band, with the NLO absorption insensitive to the excitation wavelength. This work provide fundamental and systematic insight into the NLO response of Bi2TexSe3-x nanosheets and support their application in photonic devices in the future.

摘要

我们报道了通过简便的溶剂热法制备的 Bi2TexSe3-x 纳米片的超宽带非线性光学（NLO）响应。我们的结果表明，Bi2TexSe3-x 纳米片的提取基本光学非线性参数，αNL、Imχ((3)) 和 FOM 分别达到约 10(4) cm/GW、~~10(-8) esu 和~~10(-13) esu cm，这比体介质大几个数量级。我们进一步观察了 NLO 吸收系数和 NLO 响应灵敏度随激发强度的变化。基于物理模型提出了这些现象的机制。我们还研究了 Bi2TexSe3-x 纳米片的 NLO 响应的波长依赖性，确定了 Bi2TexSe3-x 纳米片具有超宽带非线性饱和吸收特性，覆盖从可见光到近红外波段，NLO 吸收对激发波长不敏感。这项工作为 Bi2TexSe3-x 纳米片的 NLO 响应提供了基本和系统的见解，并支持它们在未来用于光子器件。