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Surface-enhanced Raman Scattering

An area of particular interest is surface-enhanced Raman scattering (SERS) which plays an increasingly important role in studies of molecules adsorbed onto metal surfaces. In the last few years, SERS enhancements of ~1015 have been reported, which has opened up the possibility of using Raman techniques for single molecule detection. Single-molecule SERS is likely to have an enormous impact in nanotechnology, biochemistry, life sciences and sensing technologies. The huge enhancements reported have been attributed to the very high enhanced fields at the surface arising from the plasmon excitations and the chemical interactions between the molecule and the surface. However, the exact nature of the enhancements and the interplay between different enhancement mechanisms are not known. Modeling the normal and enhanced Raman scattering of molecule-metal interfacial structures on the atomic scale, therefore, is crucial in understanding the nature of the observed SERS enhancements. The objective is to construct new theoretical tools for the direct simulation of SERS spectrum. Such tools will be able to give a microscopic description of SERS and thereby provide both mechanistic insights and interpretation of the otherwise complicated experimental results.

Relevant Publications:
• Y. B. Zheng, J. L Payton, C. H. Chung, R. Liu, S. Cheunkar, B. K. Pathem, Y. Yang, L. Jensen, P. S. Weiss "Surface-enhanced Raman spectroscopy to probe reversible photoswitchable azobenzene in controlled nanoscale environments" Nano Lett. 11, 3447-3452, 2011

• E. H. Witlicki, C. Johnsen, S. W. Hansen, D. W. Silverstein, V. J. Bottomley, J. O. Jeppesen, E. W. Wong, L. Jensen, A. H. Flood "Molecular logic gates using surface enhanced Raman-scattered light" J. Am. Chem. Soc., 133, 7288-7291, 2011

Q. Z. Hao, Y. Zeng, B. K. Juluri, X. D. Wang, B. Kiraly, I. K. Chiang, L. Jensen, D. H. Werner, V. H. Crespi, T. J. Huang "Metallic Membranes with Subwavelength Complementary Patterns: Distinct Substrates for Surface-Enhanced Raman Scattering" ACS Nano, 5, 5472-5477, 2011

• Q. Hao, B. K. Juluri, Y. B. Zheng, B. Wang, L. Jensen, V. Crespi, P. C. Eklund, T. J. Huang "Effects of Intrinsic Fano Interference on Surface Enhanced Raman Spectroscopy: Comparison between Platinum and Gold" J. Phys. Chem C, 114, 18059-18066, 2010

• E. H. Witlicki, S. S. Andersen, S. W. Hansen, J. O. Jeppesen, E. W. Wong, L. Jensen and A. H. Flood "Turning on Resonant SERRS Using the Chromophore−Plasmon Coupling Created by Host−Guest Complexation at a Plasmonic Nanoarray" J. Am. Chem. Soc., 132, 6099 - 6107, 2010

• S. M. Morton, E. Ewusi-Annan, L. Jensen “Controlling the non-resonant chemical mechanism of SERS using a molecular photoswitch” Phys. Chem. Chem. Phys., 11, 7424 - 7429, 2009

• S. M. Morton, L. Jensen “Understanding the Molecule-Surface Chemical Coupling in SERS” J. Am. Chem. Soc, 131, 4090 - 4095, 2009