Photosensitive gold-nanoparticle-embedded dielectric nanowires
Photosensitive gold-nanoparticle-embedded dielectric nanowires
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DOI：
10.1038/nmat1564
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发表时间：
2006-02-01
期刊：
影响因子：
41.2
通讯作者：
Chen, LC
中科院分区：
文献类型：
--
作者：
Hu, MS;Chen, HL;Chen, LC
嵌入介电基质中的贵金属纳米颗粒被认为在超快全光开关器件中具有实际应用，这是由于它们增强的三阶非线性极化率，特别是在表面等离子体共振（SPR）频率附近（1，2）。在这里，我们提出了使用微反应器的方法来制造封装在电介质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表面等离子共振吸收。更值得注意的是，一个强大的波长依赖性和可逆的光响应已被证明在一个双端设备中使用的合奏金nanopepoded二氧化硅纳米线在光照射下，而没有光响应观察到普通的二氧化硅纳米线。这些结果显示了使用金纳米柱二氧化硅纳米线作为波长控制的光纳米开关的潜力。微反应器方法可应用于制备一系列混合金属-介电一维纳米结构，这些纳米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。
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(1,2). 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.