Release Time:2019-03-10  Hits:

Indexed by: Conference Paper

Date of Publication: 2016-10-12

Included Journals: CPCI-S、EI

Volume: 10028

Key Words: localized surface plasmon resonance; gold nanodimer; coupling; excitation light polarization direction; enhancement

Abstract: Due to the effect of plasmonic coupling, gold nanoparticle dimers have been paid more attentions in bio-imaging. The coupling effect existing at the gap between a closely linked particle pair can make the local field strongly enhanced and in which the angle between the excitation polarization and the dimer axis plays a dominant role. We calculated the amplitude distribution under a highly focused illumination objective. The simulation results show that for such a model, 45 degrees between the excitation polarization and the dimer axis can produce an optimum signal. The enhancement thus obtained is similar to 10.78 fold while the variation between peak-peak can reach 6.59 fold compared to a single plasmoic particle during the rotation of the polarization.