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) Sketch of the electric field distribution on the middle and bottom surfaces of the SRR. (b)–(e) The scattering spectra for the nanoparticle trapped at four different locations shown in (a).