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Fano Resonance of Nanocrescent for the Detection of Single Molecules and Single Nanoparticles
Authors:Chunjie Zheng  Tianqing Jia  Hua Zhao  Yingjie Xia  Shian Zhang  Donghai Feng  Zhenrong Sun
Institution:1.State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai,People’s Republic of China
Abstract:This paper reports a theoretical study on the Fano resonance of a 3D nanocrescent and its application in single molecular detection. The resonance wavelength changes with the crescent radius, gap width and thickness. The Fano resonance is attributed to the interference between the quadrupolar mode supported by the horizontal crescent and the quadrupolar mode supported by the nanotip oscillating along the height direction. The Fano resonance is highly sensitive to a nanoparticle trapped by the nanocrescent. The wavelength shift is larger than 0.5 nm when a single protein nanoparticle with radius only of 1.25 nm is trapped. For a protein with radius of 0.3 nm, the wavelength shift is still larger than 0.03 nm, over the detection limit (10?5 nm) by 3 orders in the magnitude, which indicates that the nanocrescent can be used to detect small molecule with several atoms.
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