Hu Ming-Shien, Chen Hsin-Li, Shen Ching-Hsing, Hong Lu-Sheng, Huang Bohr-Ran, Chen Kuei-Hsien, Chen Li-Chyong
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
Nat Mater. 2006 Feb;5(2):102-6. doi: 10.1038/nmat1564. Epub 2006 Jan 22.
Noble-metal nanoparticles embedded in dielectric matrices are considered to have practical applications in ultrafast all-optical switching devices owing to their enhanced third-order nonlinear susceptibility, especially near the surface-plasmon-resonance (SPR) frequency. Here we present the use of a microreactor approach to the fabrication of a self-organized photosensitive gold nanoparticle chain encapsulated in a dielectric nanowire. Such a hybrid nanowire shows pronounced SPR absorption. More remarkably, a strong wavelength-dependent and reversible photoresponse has been demonstrated in a two-terminal device using an ensemble of gold nanopeapodded silica nanowires under light illumination, whereas no photoresponse was observed for the plain silica nanowires. These results show the potential of using gold nanopeapodded silica nanowires as wavelength-controlled optical nanoswitches. The microreactor approach can be applied to the preparation of a range of hybrid metal-dielectric one-dimensional nanostructures that can be used as functional building blocks for nanoscale waveguiding devices, sensors and optoelectronics.
嵌入电介质基质中的贵金属纳米颗粒由于其增强的三阶非线性磁化率，特别是在近表面等离子体共振（SPR）频率附近，被认为在超快全光开关器件中有实际应用。在此，我们展示了使用微反应器方法制备封装在介电纳米线中的自组织光敏金纳米颗粒链。这种混合纳米线显示出明显的SPR吸收。更值得注意的是，在光照下使用一组金纳米豆荚状二氧化硅纳米线的两终端器件中，已经证明了强烈的波长依赖性和可逆光响应，而普通二氧化硅纳米线未观察到光响应。这些结果表明了使用金纳米豆荚状二氧化硅纳米线作为波长控制光学纳米开关的潜力。微反应器方法可应用于制备一系列混合金属 - 电介质一维纳米结构，这些结构可用作纳米级波导器件、传感器和光电子学的功能构建块。
