Dispersion engineering in regular and graded photonic crystals to promote anomalous refraction effects are studied by the authors of this book, from the basic concepts to experimental demonstration via nanofabrication considerations. Self-collimation, ultra- and negative refraction, second harmonic generation, mirage and invisibility effects, which lead to an unprecedented control of light propagation at the (sub-) wavelength scale for the field of integrated nanophotonics, are detailed and commented upon.
In Chapter 1, the fundamental concepts for the exploitation of light propagation in photonic crystals are reviewed, based on the exploitation of band structures and equi-frequency surfaces. Special attention is devoted to hole and pillar dielectric lattice nanofabrication techniques, aiming to operate for wavelengths at the micron scale. Chapter 2 studies various flat lens configurations, based on regular or graded photonic crystals, both theoretically and experimentally in the field of linear optics, with special attention being paid to resolution limits. In the third and final chapter, generalizations of graded photonic crystals with an index gradient in one or two dimensions of space are investigated in order to demonstrate mirage effects or wavelength demultiplexing at very short scales. Furthermore, the mixing of hole and pillar lattices using the transformation optics tools opens the way for two-dimensional cloaking devices. Here, theoretical concepts are supported by an experimental demonstration of controlled light propagation at the wavelength scale.
1. Two-Dimensional Dielectric Photonic Crystals.
2. Flat Lenses.
3. Towards Transform Optics Based Devices.
Olivier Vanbésien is Professor at the University of Lille and a researcher at IEMN (Institute of Electronics, Micro-electronics and Nanotechnology) in Villeneuve d’Ascq, France. He is the author of Artificial Materials, published in 2012, has authored and co-authored 70 papers in international journals and has presented 40 papers at international conferences. His current research field concerns the development of photonic crystal or metamaterial-based flat lenses for operation at 1.55 µm.
Emmanuel Centeno is Professor at Blaise Pascal University in Clermont-Ferrand, France. His research fields cover electromagnetic theory and simulations of photonic crystals and metamaterials. He has recently developed new concepts of graded photonic crystals and second harmonic metamaterial flat lenses.
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