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. 2014 Oct 20;26(22):6523–6530. doi: 10.1021/cm5031848

Figure 2.

Figure 2

Optimized SERS from suspended nanohole arrays. (a) Schematics showing the process of obtaining a SERS signal from chips with air as dielectric media, resonance tuning using sucrose to improve the signal, and index matching to further optimize the signal. (b) Figure showing normalized transmission maxima at around 600 nm corresponding to (1,0) metal–air interface shifts to 785 nm after addition of the desired concentration of sucrose. (c) SERS signal obtained from the same spot on the chip with the transmission peak tuned to different wavelengths. (d) SERS signal obtained from the same spot before and after index matching. There is close to 3 times increase in signal after index matching. (e) SERS signal obtained from 4-MP SAM layers on suspended nanohole arrays as compared to FIB milled dead-ended nanoholes. The signal from suspended nanoholes is about 50 times higher than that obtained from dead-ended samples.