Dielectrics represent a new frontier for Surface Enhanced Raman Scattering. They can serve either as a complement or an alternative to conventional, metal-based SERS, offering key advantages in terms of low invasiveness, reproducibility, versatility and recyclability. In comparison to metals, dielectric systems and, in particular, semiconductors, are characterized by a much greater variety of parameters and properties that can be tailored to achieve enhanced Raman scattering or related effects. Light trapping and sub-wavelength focusing capabilities, morphology-dependent resonances, control of band gap and stoichiometry, size-dependent plasmons and excitons, charge transfer between semiconductors and molecules and vice-versa are a few examples of the manifold opportunities associated to use of semiconductors as SERS-active materials.
In this talk a few examples  of all-dielectric core/shell colloids for plasmon-free SERS, including applications in biochemistry [3-5] and environmental science, will be presented and discussed, with a special focus on the latest results regarding SERS/mass spectrometry multimodal sensing.
1) I. Alessandri, J. R. Lombardi, Chem. Rev. (2016) 116, 14921−14981.
2) I. Alessandri, J. Am. Chem. Soc. (2013) 135, 5541-5544.
3) I. Alessandri et. al., Small (2014) 10, 1294-1298.
4) I. Alessandri et al., ACS-Appl. Mater. Interf. (2016) 8, 14944-14951.
5) N. Bontempi et al. Nanoscale 2017, doi: 10.1039/C7NR0249F
6) N. Bontempi et al., Nanoscale (2016), 8, 326-3231.
7) I. Alessandri et al., Sci. Rep. (2016) 6, 34521.
Ivano Alessandri, "Enhanced Raman scattering with dielectrics (Conference Presentation)," Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105401B (Presented at SPIE OPTO: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2284188.5751523638001.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 14,000 conference presentations, including many plenary and keynote presentations.
Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon