Abstracts Book - IMRC 2018

• SA6-P154
QUASI-PERIODIC MULTILAYER DIELECTRIC-GRAPHENE
SUBSTRATES FOR RAMAN RESPONSE IMPROVEMENT
Andrea Alejandra Rodríguez Miramontes 1 , Jaime Raúl Suárez López 1 , José Samuel Pérez
Huerta 1 , Jesús Madrigal Melchor 1
1
Universidad Autónoma de Zacatecas, Unidad Académica de Física, Mexico.
Raman spectroscopy is a very important tool for specimen characterization.
However, an issue to be solved is its usually weak response. For this purpose,
mechanisms such as the electromagnetic, by substrates plasmonic excitation,
or the chemical, by charge transfer, have been studied. By other side, graphene
is a 2D material with remarkable electronic, optic and chemical properties. For
example, a graphene sheet has a frequency independent absorption of about
2.3 percent. Raman response can be amplified by plasmonic excitation of a
rugged metallic substrate. Further, 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 show that if a multilayer dielectric-graphene
in a Cantor-like arrangement substrate is considered, it is possible to excite
plasmons in the near infrared region, making it suitable for Raman response
amplification. The quasi-periodic sequence is applied via the graphene’s
chemical potential, which is tunable by doping or by gate voltage. Our results
are obtained by using the matrix-transfer method as well as ab-initio
calculations.
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: andrea.rodriguez@fisica.uaz.edu.mx