Characteristics and mechanism analysis of Fano resonances in <inline-formula> <img src="cpb_26_12_127301_ieqn001.gif"/> </inline-formula>-shaped gold nano-trimer

Characteristics and mechanism analysis of Fano resonances in

-shaped gold nano-trimer

Zhong Han-Hua¹, Zhou Jian-Hong², Gu Chen-Jie¹, Wang Mian¹, Fang Yun-Tuan³, Xu Tian⁴, Zhou Jun^{1, †}

(color online) (a) Extinction spectra of the asymmetric Π-shaped trimer surrounded by media with different refractive indices, (b) resonance wavelengths of the ACH, the ACQ, the BCQ modes, Fano dip and with different surrounding refractive indices, and the refractive index sensitivities of plasmon modes and Fano dips are calculated and shown in the left upper corner.