Scientific Results

All-dielectric core/shell resonators: From plasmon-free SERS to multimodal analysis

Year: 2018

Authors: Bontempi N., Vassalini I., Alessandri I.

Autors Affiliation: INSTM and Chemistry for Technologies Laboratory, Mechanical and Industrial Engineering Department, University of Brescia, via Branze 38, Brescia, 2513, Italy

Abstract: All-dielectric materials are emerging as a new class of substrates for enhanced Raman scattering. As ohmic losses are reduced in the absence of plasmonic metals, Raman data obtained with dielectrics are very reproducible and reliable. This mini-review summarizes our recent work in the field of core/shell dielectric resonators designed for Raman purposes, with a special focus on SiO2/TiO2 (T-rex) core/shell beads. These systems are able to exploit the evanescent field generated by total internal reflection and multiple scattering of light at the sphere-to-sphere interface to multiply the number of Raman photons, improving the sensitivity of Raman detection and extending the application of surface enhanced Raman scattering for investigating surface chemical reactions. Examples of the application of T-Rex beads in detecting and monitoring environmental pollutants, greenhouse gases, biochemical species, and biochemical reactions are presented. The use of core/shell resonators for multimodal analysis based on the combination of surface enhanced Raman scattering with either mass spectrometry or refractive index optical sensing is also discussed, suggesting different possible future developments.

Journal/Review: JOURNAL OF RAMAN SPECTROSCOPY

Volume: 49 (6)      Pages from: 943  to: 953

More Information: Regione Lombardia. – This work was carried out in the framework of the project: “Microsfere adattative per il monitoraggio e l\’abbattimento di inquinanti persistenti-MI ADATTI E L\’ABBATTI” supported by INSTM and Regione Lombardia. We thank Dr. L. Carletti and Prof. C. De Angelis (University of Brescia) for fruitful discussions and numerical simulations of the optical properties of the core/shell resonators described in this work.
KeyWords: all-dielectric resonators; multimodal sensing; Raman sensors; SERS; T-rex beads
DOI: 10.1002/jrs.5330

Citations: 27
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-24
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