Huang Yupeng, Xu Haijiao, Zhou Zhihao, Jiang Bofan, Li Lihua, Ma Zhijun, Zhou Shifeng
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People's Republic of China.
School of Physics and Optoelectronics, The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, People's Republic of China.
Nanotechnology. 2022 Jul 25;33(41). doi: 10.1088/1361-6528/ac7abf.
Gold nanorods (AuNRs) possess a high optical nonlinear coefficient, ultrafast optical response speed and widely tunable localized surface plasmon resonance (LSPR) wavelength covering the visible and near infrared region. Therefore, they are extensively investigated for many optical applications. However, the poor thermal stability of the AuNRs seriously restricts their practical performance. In addition, for many applications, such as optical communication or laser modulation, AuNRs have to be combined with transparent solids, for example polymers, glass or crystals to make devices. Here, we report on the preparation of 0.23 mg AuNR dispersed methyl silicone resin (MSR) with longitudinal LSPR (L-LSPR) wavelength (1450 nm) in the optical communication window. We found that AuNR-silicone composites possess high thermal stability. After calcination in ambient environment at a temperature of 250 °C for 10 h, the L-LSPR peak of the sample can remain longer than 1380 nm, implying that the NR shape of the Au particles was well maintained. Using the open-aperture Z-scan technique, the nonlinear absorption coefficient of the composites was measured as -11.71 cm GW, higher than many nonlinear materials. Thus, the thermally stable AuNR@SiO-MSR composite with high nonlinearity is promising for practical applications in the optical communication window.
金纳米棒（AuNRs）具有高光学非线性系数、超快光学响应速度以及覆盖可见光和近红外区域的广泛可调谐局域表面等离子体共振（LSPR）波长。因此，它们被广泛研究用于许多光学应用。然而，AuNRs较差的热稳定性严重限制了其实际性能。此外，对于许多应用，如光通信或激光调制，AuNRs必须与透明固体，例如聚合物、玻璃或晶体结合以制造器件。在此，我们报道了制备出的在光通信窗口中纵向LSPR（L-LSPR）波长为1450 nm的0.23 mg AuNR分散的甲基硅树脂（MSR）。我们发现AuNR-硅氧烷复合材料具有高热稳定性。在环境温度250 °C下煅烧10 h后，样品的L-LSPR峰可保持在1380 nm以上，这意味着金颗粒的纳米棒形状得到了很好的保持。使用开孔Z扫描技术，测得该复合材料的非线性吸收系数为-11.71 cm GW，高于许多非线性材料。因此，具有高热稳定性和高非线性的AuNR@SiO-MSR复合材料在光通信窗口的实际应用中具有广阔前景。
