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Thermal radiation spectra as a function of the reduced frequency under normal incidence conditions for multilayered stacks (thin film) made of alternating layers of refractive indices n A = 1.45 (SiO 2 ) and n B = 1.0+0.01i, coating a thick absorbing substrate (selective emitter) of refraction index n C = 3+0.03i. The entire structure is embedded in air (n = 1). The thin film coat layers are respectively arranged according to the following sequences: (a) periodic, and (b) Fibonacci (N = 377). The perfect blackbody thermal spectrum is given by the dotted curve, whereas the dashed curve gives the thermal spectrum of the substrate. The temperature is chosen so that the blackbody (Wien) peak is aligned with the midgap frequency ω 0 = 2πc/λ 0 (λ 0 = 700 nm). All the curves are properly normalized by this peak power. (Adapted from (de Medeiros 2007). Courtesy of Eudenilson L. Albuquerque).
Source publication
Photonic aperiodic structures based on the golden ratio can lead to more efficient
photon management due to increased degrees of freedom in their design as compared to their
periodic counterparts. In this work we will describe the thermal emission control capabilities
related to the systematic use of Fibonacci multilayers and Penrose tilings in ord...
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Citations
This book provides an interdisciplinary guide to quasicrystals, the 2011 Nobel Prize in Chemistry winning topic, by presenting an up-to-date and detailed introduction to the many fundamental aspects and applications of quasicrystals science. It reviews the most characteristic features of the peculiar geometric order underlying their structure and their reported intrinsic physical properties, along with their potential for specific applications.
The role of quasiperiodic order in science and technology is also examined by focusing on the new design capabilities provided by this novel ordering of matter. This book is specifically devoted to promoting the very notion of quasiperiodic order, and to spur its physical implications and technological capabilities. It explores the fundamental aspects of intermetallic, photonic and phononic quasicrystals, as well as soft-matter quasicrystals, including their intrinsic physical and structural properties. In addition, it thoroughly discusses experimental data and related theoretical approaches to explain them, extending the standard treatment given in most current solid state physics literature. It also outlines exciting applications in new technological devices of quasiperiodically ordered systems, including multilayered quasiperiodic systems, along with 2D and 3D designs, whilst outlining new frontiers in quasicrystals research.
