By courtesy of:
Verónica Salgueiriño-Maceira* and Miguel A. Correa-Duarte*
Adv. Mater. 2007, 19, 4131
and here for color tuning:
Structural colour printing using a magnetically tunable and lithographically fixable photonic crystal
Hyoki Kim, Jianping Ge, Junhoi Kim, Sung-eun Choi, Hosuk Lee, Howon Lee, Wook Park, Yadong Yin and Sunghoon Kwon*
NATURE PHOTONICS 2009, 3, 534-540
and its review:
Tunable structural colour
Duncan Graham-Rowe
Nature Photonics 2009, 3, 551-3