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Engineering Colloidal Lithography and Nanoskiving to Fabricate Rows of Opposing Crescent Nanogaps
Author(s) -
Gu Panpan,
Zhang Wei,
Zhao Zhiyuan,
Ai Bin,
Zheng Tianxing,
Chiechi Ryan C.,
Li Chunguang,
Shi Zhan,
Zhang Gang
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202000006
Subject(s) - materials science , electric field , lithography , surface plasmon polariton , surface plasmon resonance , plasmon , nanowire , fabrication , nanotechnology , surface plasmon , nanolithography , optoelectronics , polarization (electrochemistry) , surface enhanced raman spectroscopy , nanostructure , localized surface plasmon , raman spectroscopy , raman scattering , optics , nanoparticle , chemistry , physics , pathology , medicine , quantum mechanics , alternative medicine
A scalable fabrication route combining colloidal lithography and nanoskiving is reported for generating free‐standing asymmetric metal nanostructures of crescent‐shaped gold nanowires and rows of opposing crescents with and without nanogaps. Strong localized surface plasmon resonances and propagating surface plasmon polaritons are excited at the sharp tips of the crescent and in the sub‐10 nm nanogaps. High‐order resonance modes are excited due to the coupling between the resonances in the tips and gaps. The Raman signals are greatly enhanced due to the strong electric fields. In addition, the optical responses and electric field distributions can be controlled by the polarization of the incident light. The strong electric field enhancement coupled with facile, scalable fabrication make crescent‐shaped nanostructures promising in nonlinear optics, optical trapping, and surface‐enhanced spectroscopy.