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. Author manuscript; available in PMC: 2014 Oct 8.
Published in final edited form as: IEEE J Sel Top Quantum Electron. 2014 May/June;20(3):6900806. doi: 10.1109/JSTQE.2014.2301016

Fig. 3.

Fig. 3

(a) SERS spectra of 1 μM R6G coated on Ag NPs-on-diatom (black) and Ag NPs-on-glass (red). (b) Intensities of Raman band at 1368 cm−1 for different R6G concentrations. (c) Optical image of the sensing area scanned for SERS enhancement and (d) mapping of Raman signal intensity at 1368 cm−1. During the measurement, the excitation power was set at 1.2 mW and integration time was 1 s.