Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan.
ACS Nano. 2011 Oct 25;5(10):8223-9. doi: 10.1021/nn2029007. Epub 2011 Sep 9.
Plasmonic nanoantenna arrays hold great promise for diffraction-unlimited light localization, confinement, and transport. Here, we report on linear plasmonic nanoantenna arrays composed of colloidal gold nanocubes precisely assembled using a nanomanipulation technique. In particular, we show the direct evidence of dark propagating modes in the plasmon coupling regime, allowing for transport of guided plasmon waves without far-field radiation losses. Additionally, we demonstrate the possibility of plasmon dispersion engineering in coupled gold nanocube chains. By assembling a nanocube chain with two sections of coupled nanocubes of different intercube separations, we are able to produce the effect of a band-pass nanofilter.
等离子体纳米天线阵列在实现无衍射的光局域、限制和传输方面具有巨大的潜力。在这里，我们报告了由胶体金纳米立方体组成的线性等离子体纳米天线阵列，这些纳米立方体是通过纳米操纵技术精确组装而成的。特别地，我们展示了在等离子体耦合状态下暗传播模式的直接证据，从而允许引导等离子体波的传输，而不会产生远场辐射损耗。此外，我们还展示了在耦合金纳米立方体链中进行等离子体色散工程的可能性。通过组装一个由两段具有不同立方体间分离的耦合纳米立方体组成的纳米立方体链，我们能够产生带通纳米滤波器的效果。
