Abstract
Interaction between plasmonic nanostructures and external light can excite coherent oscillation of electrons, thereby brings a field enhancement due to the localized surface plasmon resonance (LSPR). Due to their excellent characteristics, metallic gap nanostructures have been widely used in front research fields, such as physics, biomedical sciences, food chemistries, etc.. Intensity of the plasmonic field in metallic GAP structures can be enhanced with orders of magnitude compared to the excitation beam, which provides an effective tool to investigate nonlinear effects. The nonlinear variation of physical properties, especially for dielectric constant and polarizability of the plasmonic Bowtie structures, will introduce great influences on the field distribution. Consequently, the optical force and potential well in such gap structures show novel properties. This new characteristics will play a significant role in future developments and applications of plasmonic tweezers.
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