BGO 单晶体中嵌入的 Ag 纳米颗粒的非线性吸收响应：从双光子吸收到三光子吸收。

Nonlinear Absorption Response Correlated to Embedded Ag Nanoparticles in BGO Single Crystal: From Two-Photon to Three-Photon Absorption.

机构信息

School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China.

Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai, 201800, China.

出版信息

Sci Rep. 2018 Jan 31;8(1):1977. doi: 10.1038/s41598-018-20446-6.

DOI:10.1038/s41598-018-20446-6

PMID:29386564

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5792466/

Abstract

We report on the embedded silver (Ag) nanoparticles fabricated by Ag ion implantation into the BiGeO (BGO) crystal. Localized surface plasmon resonance (LSPR) phenomenon has been observed by linear optical absorption spectrum, which is accordance with the expectation based on Mie theory calculation. Further proofs are given by SRIM, TEM and SAED analysis, which explain the slight difference between experiment and calculation. Based on the z-scan system, it is found that the nonlinear optical response is converted from two-photon absorption to three-photon absorption under the 515 nm femtosecond pulse excitation within the LSPR band. The nonlinear absorption coefficient is measured to be ~3.1 × 10 cm/W (two-photon absorption coefficient) and ~8.9 × 10cm/W (three-photon absorption coefficient) for pure BGO crystal and the sample embedded with Ag nanoparticles (Ag:BGO), respectively. Finally, we have proposed a model to explain the asymmetric nonlinear transmittance, which is in good agreement with the experimental results.

摘要

我们报告了通过将银离子注入到 BiGeO（BGO）晶体中制造的嵌入式银（Ag）纳米粒子。通过线性光学吸收光谱观察到局域表面等离子体共振（LSPR）现象，这与基于 Mie 理论计算的预期相符。进一步的证明来自 SRIM、TEM 和 SAED 分析，它们解释了实验与计算之间的细微差异。基于 z 扫描系统，发现在 LSPR 带内，515nm 飞秒脉冲激发下，非线性光学响应从双光子吸收转换为三光子吸收。测量得到纯 BGO 晶体和嵌入 Ag 纳米粒子（Ag:BGO）的样品的非线性吸收系数分别约为~~3.1×10^-3cm/W（双光子吸收系数）和~~8.9×10^-3cm/W（三光子吸收系数）。最后，我们提出了一个模型来解释非对称的非线性透过率，该模型与实验结果吻合良好。