Surface enhanced Raman scattering of crystal violet
Despite the ubiquity of Raman spectroscopy, fluorescence, poor signal strength and photobleaching pose a significant challenge to researchers in the biomedical field. Here, we demonstrate a 17-fold signal enhancement in Raman spectra of crystal violet via surface-enhanced Raman scattering (SERS). The SERS substrate was fabricated by electron beam lithography (EBL); the nanostructured surface was an array of G-shaped elements made of Au on SiO2/Si. In addition to the SERS spectra, finite-difference time-domain simulations were performed to illustrate the distribution of electric-field hot-spots on the SERS substrate. The electric-field hot-spots were prominent at the vertices and edges of the nanostructured G-shaped motifs. The results presented here demonstrate that EBL is a high-end choice for SERS substrate fabrication that opens the way for more complex Raman spectroscopies, for instance involving nonlinear optics or chiral analytes.
Univ. of Bath (United Kingdom)
Robin is a PhD student working with Prof. Ventsislav Valev and Prof. Daniel Wolverson in partnership with Renishaw to develop advanced hyper-spectral microscopy techniques. Robin obtained his MSci degree in Physics at the University of Birmingham in 2012. During his undergraduate degree he was employed by the Nanoscale Physics Research Laboratory at the University of Birmingham to study atomic cluster source technology and implantation in graphite. He then did a PhD in Mechanical Engineering at the University of Bath. After a postdoctoral role designing laser instruments, Robin worked as an engineering analyst in the defence and space sector. Robin has returned to Physics to pursue a PhD in the Centre of Photonics and Photonic Materials and the Centre for Nanoscience and Nanotechnology.
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