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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. 4.

Fig. 4

(a) SEM image of the acquisition area for SERS mapping. (b) The map of Raman signal intensity at 1368 cm−1 normalized by the NP numbers in each grid showing in the SEM image. The excitation power was set at 1.2 mW and the integration time was 1 s.