The design and optimization of plasmonic crystals for surface enhanced Raman spectroscopy using the finite difference time domain method

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dc.contributor.authorBigness, Alec
dc.contributor.authorMontgomery, Jason M.
dc.date.accessioned2022-11-29T15:06:22Z
dc.date.available2022-11-29T15:06:22Z
dc.date.issued2018
dc.description.abstractWe present computational studies of quasi three-dimensional nanowell (NW) and nanopost (NP) plasmonic crystals for applications in surface enhanced Raman spectroscopy (SERS). The NW and NP plasmonic crystals are metal coated arrays of cylindrical voids or posts, respectively, in a dielectric substrate characterized by a well/post diameter (D), relief depth (R D), periodicity (P), and metal thickness (M T). Each plasmonic crystal is modeled using the three-dimensional finite-difference time-domain (FDTD) method with periodic boundary conditions in the x- and y-directions applied to a computational unit cell to simulate the effect of a periodic array. Relative SERS responses are calculated from time-averaged electric field intensity enhancements at λ exc and λ scat or at λ mid via G SERS 4 = g 2 ( λ exc ) × g 2 ( λ scat ) or G mid 4 = g 4 ( λ mid ) , respectively, where g 2 = | E | 2 / | E 0 | 2 . Comparisons of G SERS 4 and G mid 4 are made to previously reported experimental SERS measurements for NW and NP geometries. Optimized NW and NP configurations based on variations of D, P, R D, and M T using G SERS 4 are presented, with 6× and 2× predicted increases in SERS, respectively. A novel plasmonic crystal based on square NP geometries are considered with an additional 3× increase over the optimized cylindrical NP geometry. NW geometries with imbedded spherical gold nanoparticles are considered, with 10× to 10 3 × increases in SERS responses over the NW geometry alone. The results promote the use of FDTD as a viable in silico route to the design and optimization of SERS active devices.
dc.identifier.citationAlec Bigness, & Jason Montgomery. (2018). The Design and Optimization of Plasmonic Crystals for Surface Enhanced Raman Spectroscopy Using the Finite Difference Time Domain Method. Materials, 11(5), 672. https://doi.org/10.3390/ma11050672
dc.identifier.issn1996-1944
dc.identifier.urihttps://search.ebscohost.com/login.aspx?direct=true&AuthType=shib&db=edsdoj&AN=edsdoj.595203c28dcf4dc699cef21f14013683&site=eds-live&scope=site&custid=s5615486
dc.identifier.urihttps://doaj.org/article/595203c28dcf4dc699cef21f14013683
dc.identifier.urihttps://hdl.handle.net/11416/952
dc.language.isoen_US
dc.publisherMDPI AG
dc.subjectResearch Subject Categories::NATURAL SCIENCES::Chemistry
dc.subjectResearch Subject Categories::NATURAL SCIENCES::Physics
dc.titleThe design and optimization of plasmonic crystals for surface enhanced Raman spectroscopy using the finite difference time domain method
dc.typeArticle

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