Figure 6From: Optical sensing nanostructures for porous silicon rugate filtersReflectance spectra of C-PSRF. C-PSRF when exposed to N2 (a 1 , b 1 , and c 1 ), gas mixture of N2 and ethanol vapor (a 2 , b 2 , and c 2 ), and N2 (a 3 , b 3 , and c 3 ).Back to article page