Fig. 3. Raman and ROA spectra of (±)-alpha-pinene (a pair of enantiomers) with and without the chiral-field enhancement by the silicon nanodisk array.

a Raman spectra of (±)-alpha-pinene on the silica substrate and the silicon nanodisk array. The Raman intensity is ~100x enhanced by the silicon nanodisk array. b ROA spectra of (±)-alpha-pinene on the silica substrate and the silicon nanodisk array. The ROA intensity is ~100x enhanced by the silicon nanodisk array.