Abstracts Book - IMRC 2018

• SA6-P072
RAMAN RESPONSE AMPLIFICATION VIA MULTILAYER
DIELECTRIC-GRAPHENE SUBSTRATES
Paola Rosales Legaspi 1 , Jaime Raúl Suárez López 1 , José Samuel Pérez Huerta 2 , Jesús Madrigal
Melchor 1
1
Universidad Autónoma de Zacatecas, Unidad Académica de Física, Mexico. 2 Universidad
Autónoma de Zacatecas, Unidad Autónoma de Zacatecas, Mexico.
Raman spectroscopy provides information about molecular vibrations, which
can be used for identification and quantification of molecules in a specimen.
However, Raman response is usually weak, so mechanisms for its enhancement
are looked forward. Mechanisms such as the electromagnetic, by substrates
plasmonic excitation, or the chemical, by charge transfer, have been studied.
Further, unlike common metals, a graphene sheet supports both TE and TM
plasmonic modes, but at frequencies in the far infrared region, out of the Raman
response region. In this work, we consider a biological specimen on a periodic
multilayer dielectric-graphene substrate and we obtain its Raman response by
making use of DFT theory and the matrix-transfer method. Results show that in
this dielectric-graphene multilayer system, near infrared plasmonic excitation is
possible, and then suitable for Raman response amplification
Acknowledgment:
This project is supported by National Council for Science and Technology,
Mexico (CONACyT) grant no. 259278.
Keywords: Raman enhancement, biosensor, graphene multilayer
Presenting authors email: paola.rosales@fisica.uaz.edu.mx