Tuning nanoporous anodic alumina distributed-Bragg reflectors with the number of anodization cycles and the anodization temperature

Table 1 Average stop band width and corresponding standard deviation as a function of the pore-widening time

Pore-widening time (min)	Average stop band width (nm)	Stop band width standard deviation (nm)
0	103	22
9	68	14
18	50	5
27	46	6

The average and standard deviation have been obtained for all the samples with a given pore-widening time and different temperatures. The small value of the standard deviation as compared with the average stop band width indicates that the temperature has a small influence in the refractive index contrast obtained with the cyclic voltage anodization.