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In this work, we used a finite-difference time-domain (FDTD) characterization to demonstrate that the e-field near metal nanoparticles (NPs) can be enhanced by dielectric grating structure. An array of Au NPs (ϕ = 60 nm) with 4 nm gaps is set as a plasmonic system. The Au NP arrays on a flat polydimethylsiloxane (PDMS) substrate and a thin Au film-coated substrate are considered as control samples. Coupling with a PDMS line grating (5 μm × 3 μm × 1 μm = width × gap × height) is carried out by placing the Au NP array on the PDMS grating and by putting the PDMS grating on the Au NP array on a thin Au-film-coated substrate. The dependences of the Wavelength and the angle of incidence of a plane-wave source on the e-field intensity are investigated. For the sample systems in the result, the maximum e-field of the PDMS-grating-coupled samples is enhanced by more than a factor of two compared to that in the control samples. This finding will be helpful to develop e-field-enhancing templates for surface-enhanced raman spectroscopy (SERS) applications.
목차
I. Introduction
II. Methods
III. Results and Discussions
IV. Summary
REFERENCES
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