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IQSE AMO/QO Seminar Series

"Modern 2D and 3D Substrates for Surface-Enhanced Raman Spectroscopy"

Dr. Dmitry Kurouski
Texas A&M University


Lithographic and nonlithographic two-dimensional (2D) substrates for surface-enhanced Raman spectroscopy (SERS) have gained enormous popularity as analytical platforms for detection and identification of various analytes. These substrates have a reproducible and predictable localized surface plasmon resonance throughout the entire visible region and much of the near-IR region of the electromagnetic spectrum. In this presentation, an interrelationships of nanoscale structure and near- and far-field properties of these 2D SERS platforms will be discussed. It will be shown how line width and spectral position of the far-field and near-field resonances of 2D SERS platforms directly depend on the nanofeature distribution at the metallic surface. It will be also discussed how the actual nanofeature morphology and distribution directly impact the spectral alignment of the far-field and near-field resonances. Next, I will introduce modern inkjet paper- and fabric-based 3D SERS substrates. These platforms allow for detection and the identification of chemical and biological analytes down to the nanogram and femtogram levels. It will be shown how wavelength scanned surface-enhanced Raman excitation spectroscopy (WS-SERES) and finite-difference time-domain (FDTD) calculations can be used to determine their near-field SERS properties and correlate them with morphological and far-field properties. The combination of these analytical approaches provides a full spectroscopic characterization of 3D SERS substrates, while FDTD simulation can be used to design new 3D SERS substrates with tailored spectral characteristics.

Wednesday, February 7, 2018
IQSE Seminar Room, 12:00 Noon
(578 MPHY)

Institute for Quantum Science and Engineering
Texas A&M University

Lunch (sandwich) will be served 15 minutes prior to start time