"Molecular Plasmonics: Nanoscale Sensing and Spectroscopy"
Presented by Prof. Richard P. Van Duyne, Northwestern University
During the last few years, there has been an explosion of interest and activity in the field of plasmonics. The goal is to control and manipulate light on the nanometer length scale using the properties of the collective electronic excitations in noble metal films or nanoparticles, known colloquially as surface plasmons. An improved understanding of the interactions between adsorbed molecules and plasmonic nanostructures (i.e., molecular plasmonics) is having a significant impact on many applications, including localized surface plasmon resonance (LSPR) spectroscopy [1] for chemical and biological sensing, sub-wavelength optical microscopy, surface-enhanced Raman spectroscopy (SERS), [2] and nanolithography.
Plasmonics is a materials driven subject. The unifying theme in this lecture will be the fabrication of size and shape-tunable, silver and gold nanoparticles using nanosphere lithography (NSL), electron beam lithography (EBL), and chemical synthetic methods. Size and shape tunability leads to an exquisite degree of control over the magnitude and spatial extent of the surface electromagnetic fields that surround optically excited nanoparticles. In turn, this has enabled fundamental new insights into the electromagnetic (EM) field enhancement mechanism underlying both LSPR and SER spectroscopy. This lecture will cover recent developments in three areas of plasmonics research: (1) localized surface plasmon resonance spectroscopy; (2) surface enhanced Raman spectroscopy; and (3) the development of biosensors [3] based on both LSPR and SER spectroscopy.
[1] “Localized Surface Plasmon Spectroscopy and Sensing,” K. A. Willets and R. P. Van Duyne, Ann. Rev. Phys. Chem., 58, 267-297 (2007)
[2] “Surface-Enhanced Raman Spectroscopy,” P. Stiles, J. Dieringer, N. C. Shah, and R. P. Van Duyne, Ann. Rev. Anal. Chem., 1, 601-626 (2008)
[3] “Biosensing with plasmonic nanosensors,” J. N. Anker, W. P. Hall, O. Lyandres, J. Zhao, N. C. Shah, and R. P. Van Duyne, Nature Materials, 7, 442-453 (2008)
Hosted by Prof. Kenneth Eisenthal
Thursday, December 10, 2009
Meet the speaker at 1:30pm in room 328 Havemeyer
Tea & cookies at 4:00pm in room 328 Havemeyer
Seminar at 4:30pm in room 209 Havemeyer
