Nonlinear effects in plasmonic bowtie gap structures

Wenjun Zhang; Yuquan Zhang; Changjun Min; Xiao-Cong Yuan

doi:10.1117/12.2573842

10 October 2020 Nonlinear effects in plasmonic bowtie gap structures

Wenjun Zhang, Yuquan Zhang, Changjun Min, Xiao-Cong Yuan

Author Affiliations +

Proceedings Volume 11549, Advanced Optical Imaging Technologies III; 115491B (2020) https://doi.org/10.1117/12.2573842
Event: SPIE/COS Photonics Asia, 2020, Online Only

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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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Wenjun Zhang, Yuquan Zhang, Changjun Min, and Xiao-Cong Yuan "Nonlinear effects in plasmonic bowtie gap structures", Proc. SPIE 11549, Advanced Optical Imaging Technologies III, 115491B (10 October 2020); https://doi.org/10.1117/12.2573842

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