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. 2021 May 24;12:3062. doi: 10.1038/s41467-021-23364-w

Fig. 2. Experimental chiral-field-enhanced ROA system.

Fig. 2

a Fabrication of the silicon nanodisk array. EBL: electron beam lithography. ICP: inductively coupled plasma etching. b SEM images of the fabricated silicon nanodisk array. The insets show enlarged SEM images of the nanodisk array. c Reflection spectra of the silicon nanodisk array excited by incident LCP and RCP light. d Two-phase virtual-enantiomer ROA setup. LP linear polarizer, QWP quarter-wave plate, HMF half-wave plate in a motorized flipper, BS beam splitter, HL halogen lamp, OAPM off-axis parabolic mirror, RHWP rotating half-wave plate, NF notch filter, CC CMOS camera. e Chiral-field-enhanced Raman and ROA spectra of toluene (an achiral sample).