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Non-plasmonic electromagnetic enhancement in dielectric nanoparticles. (a) A dielectric sphere acts as a microlens, focusing light; (b) in a core-shell dielectric resonator, light is partially trapped inside the core. The Raman signal is amplified by the evanescent waves generated at the surface of the core. Reproduced with permission from Bontempi et al. [205]. Copyright (2018), John Wiley and Sons.
