Abstract
Photonic crystals are periodically arranged nanoparticles of various materials that exhibit interesting light propagation properties. The incoming light confronts a periodic variation of high and low refractive index and this contrast can lead to a photonic bandgap (PBG) at certain wavelengths. Chromogenics is the area of study of materials and thin films whose optical properties can be changed reversibly under the application of various external forces. Some transition metal oxides (TMO) exhibit very efficient chromogenic properties. In this chapter a detailed discussion of the TMO thin films–based chromogenic photonic crystals is presented. The fundamental properties underlying the chromogenic (photochromic, thermochromic, and electrochromic) phenomenon occurring in the well-known TMO thin films such as tungsten oxide (WO3), vanadium oxides (VO2 and V2O5), and molybdenum oxide (MoO3) are discussed. The possibility to interactively control the PBG is very interesting from both physics and application point of view.
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