Two distinct approaches to tune multiple reflective bands of one-dimensional photonic crystal at normal incidence

Two different methods are illustrated to tune multiple reflective bands. For both two types of one-dimensional (1D) photonic crystal (PC) construction, positions of multiple reflective bands can be regulated under certain principles. In addition, the 1D PC heterostructure could be adopted to modulate the relative intensities of reflectance between multiple reflective bands. Structural color is revealed by transforming reflection spectra into CIE coordinates, and the obtained results indicate that CIE coordinate shift occurs due to either band position change or band reflectance variation. The CIE coordinate shift behavior is also influenced by the number of multiple reflective bands. The two approaches reported in this work may provide insights for the application of 1D PC in areas such as displays, sensors, and decoration.