Theoretical study on the lasing plasmon of a split ring for label-free detection of single molecules and single nanoparticles<xref rid="cpb_27_5_057802_fn1" ref-type="fn">*</xref> <fn id="cpb_27_5_057802_fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11474097, 11374099, and 11274116) and the Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics), China.</p> </fn>

Theoretical study on the lasing plasmon of a split ring for label-free detection of single molecules and single nanoparticles* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474097, 11374099, and 11274116) and the Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics), China.

Zheng Chunjie, Jia Tianqing^†, Zhao Hua, Xia Yingjie, Zhang Shian, Sun Zhenrong

(color online) (a) The scattering and (b) absorption spectra of the SRR with no gain medium. The spatial distribution of the electric field amplitudes at the (c) quadrupolar and (d) hexapolar resonance modes.