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Different Transmission Enhancement Mechanisms in a Sandwiched Nanofilm
Author(s) -
Zhou Yadong,
Zhao Yan,
Zou Shengli
Publication year - 2017
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201600327
Subject(s) - materials science , surface plasmon polariton , wavelength , surface plasmon resonance , surface plasmon , layer (electronics) , transmission (telecommunications) , optics , coupling (piping) , plasmon , resonance (particle physics) , optoelectronics , polariton , nanotechnology , nanoparticle , composite material , physics , telecommunications , particle physics , computer science
Using numerical approaches, two different mechanisms leading to enhanced transmission in a sandwiched nanofilm are demonstrated. The film is composed of a flat silver layer and two layers of silver prisms arrays on its both sides. The central flat silver layer is coated with glass substrates on its both sides and the silver prisms arrays are deposited on the glass layers. In the calculations, two different mechanisms leading to enhanced transmission are found. One mechanism follows the conventional believing in which the resonance wavelength depends on the neighboring distance between silver prisms in the array. The enhancement is due to the coupling of propagating surface plasmon polaritons (SPPs). In another mechanism, the resonance wavelength depends on the distance between the silver prisms array and the flat film rather than the neighboring distance between silver prisms in the array. The enhancement is due to the localized surface plasmons instead of propagating SPPs. By changing the thickness of the glass layers, these two mechanisms can also work cooperatively. Parameters that affect the enhanced transmission of the sandwiched nanofilm were also briefly studied.