Ultrasensitive nanosensors based on localized surface plasmon resonances: From theory to applications

Chen Wen¹, Hu Huatian², Jiang Wei¹, Xu Yuhao¹, Zhang Shunping^1,, Xu Hongxing^{1, 2,}

(color online) Refractometric sensing using dark plasmons. (a1) and (a2) Experimental demonstration of Fano resonances in an Au nanodisk heptamer can sustain a sensing FOM of 5.7.^[20] (b1) and (b2) Cavity plasmons in an Ag nanocube dimer exhibit an FOM of up to 61, approaching the ultimate limit of the sensitivity.^[28] Reprinted with permission from Copyright 2010 American Chemical Society, Copyright 2016 Royal Society of Chemistry. The unit a.u. is short for arbitrary units.