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Non plasmonic SERS with Si.pdf (790.49 kB)

Non-Plasmonic SERS with Silicon: Is It Really Safe? New Insights into Opto-Thermics of Core/Shell Microbeads

preprint
submitted on 23.01.2018 and posted on 24.01.2018 by Nicolò Bontempi, Irene Vassalini, Stefano Danesi, Matteo Ferroni, Paolo Colombi, Ivano Alessandri

Here we investigate for the first time the opto-thermal behavior of SiO2/Si core/shell microbeads (Si-rex) irradiated with three common Raman laser sources (lambda=532, 633, 785 nm) under real working conditions. We obtained an experimental proof of the critical role played by bead size and aggregation in heat and light management, demonstrating that in the case of strong opto-thermal coupling the temperature can exceed that of the melting points of both core and shell components. In addition, we also show that weakly coupled beads can be utilized as stable substrates for plasmon-free SERS experiments.

History

Topic

  • Core-Shell Materials
  • Optical Materials

Email Address of Submitting Author

ivano.alessandri@unibs.it

Institution

University of Brescia

Country

Italy

ORCID For Submitting Author

0000-0003-0332-0723

Declaration of Conflict of Interest

No conflict of interest

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