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Highly Controlled Surface‐Enhanced Raman Scattering Chips Using Nanoengineered Gold Blocks
Author(s) -
Yokota Yukie,
Ueno Kosei,
Misawa Hiroaki
Publication year - 2011
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201001560
Subject(s) - raman scattering , materials science , raman spectroscopy , nanostructure , nanotechnology , finite difference time domain method , scattering , optics , physics
Well defined gold nanostructures of various sizes are fabricated on glass substrates using high‐resolution electron‐beam lithography/lift‐off techniques and detailed surface‐enhanced Raman scattering (SERS) properties of crystal violet molecules are studied in order to elucidate electromagnetic (EM) field enhancement effects on the fabricated structures. SERS measurements are performed with high reproducibility using in situ Raman microspectroscopy in aqueous solution. An analysis based on EM theory is performed using field‐enhancement factors obtained from finite‐difference time‐domain (FDTD) simulations and the analysis reproduces experimental results very well. It is noteworthy, furthermore, that the proposed analytic method of EM effects on SERS allows the estimate of the ideal local temperature of gold nanostructures by canceling out the difference in EM field factors at Stokes and anti‐Stokes Raman scattering wavelengths. Thus, these experimental results demonstrate that quantitative analysis based on EM theory can be obtained using highly controlled gold nanostructures for SERS measurements with high reproducibility, a result that is promising for the construction of a SERS analysis chip. Although no SERS chip reported so far has been usable for quantitative analysis, this study opens the door for construction of a quantitative SERS chip.