Spatial localization of hotspots in Fano-resonant plasmonic oligomers for surface-enhanced coherent anti-Stokes Raman scatteringArpan Dutta and Erik M. VartiainenJ. Eur. Opt. Soc.-Rapid Publ., 16 1 (2020) 8DOI: https://doi.org/10.1186/s41476-020-00128-5