Xi Zheng, Lu Yonghua, Yu Wenhai, Yao Peijun, Wang Pei, Ming Hai
Opt Express. 2013 Dec 2;21(24):29365-73. doi: 10.1364/OE.21.029365.
We report a two-colored plasmonic antenna which can control the directivity of the excitation and emission light independently and simultaneously. By carefully tuning the phase difference of the constituting elements of the antenna, unidirectional fluorescence emission and laser light scattering can be obtained. In particular, the direction of the maximum emission and minimum scattering can be tailored in the same direction resulting improvement of signal to noise ratio in single molecule experiment. A two-dipole model is applied to describe the phenomena. The radiation and scattering pattern can be further tuned by varying the antenna structure.
我们报道了一种双色等离子体天线，它能够独立且同时地控制激发光和发射光的方向性。通过仔细调节天线构成元件的相位差，可以实现单向荧光发射和激光散射。特别地，最大发射方向和最小散射方向可以调整到同一方向，从而提高单分子实验中的信噪比。应用双偶极子模型来描述这些现象。通过改变天线结构，辐射和散射模式可以进一步调整。
