Department of Electrical and Computer Engineering and Photonics Center, Boston University,Boston, Massachusetts 02215, USA.
Opt Lett. 2010 Feb 15;35(4):538-40. doi: 10.1364/OL.35.000538.
We propose a type of photonic-plasmonic antennas capable of focusing light into subwavelength focal point(s) at several wavelengths, which are formed by embedding conventional dimer gap or bow-tie nanoantennas into multiple-periodic gratings. Fano-type coupling between localized surface plasmon resonances of dimer antennas and photonic modes in the gratings adds new functionalities, including multiple-wavelength operation and controllable enhancement of the field intensity in the focal point. Multiple-wavelength operation of nanoantennas provides tremendous opportunities for broadband single-molecule fluorescence and Raman sensing, emission enhancement, and near-field imaging.
我们提出了一种光子等离子体天线，它能够在几个波长处将光聚焦到亚波长焦点，这些焦点是通过将传统的二聚体间隙或蝴蝶结纳米天线嵌入到多周期光栅中形成的。二聚体天线的局域表面等离子体共振与光栅中的光子模式之间的 Fano 型耦合增加了新的功能，包括多波长操作和在焦点处可控地增强场强。纳米天线的多波长操作为宽带单分子荧光和拉曼传感、发射增强和近场成像提供了巨大的机会。
