By Olivier Vanbésien, Emmanuel Centeno
This ebook indicates how dispersion engineering in dimensional dielectric photonic crystals gives you new results for the suitable keep watch over of sunshine propagation for built-in nanophotonics.
Dispersion engineering in general and graded photonic crystals to advertise anomalous refraction results is studied from the innovations to experimental demonstration through nanofabrication concerns. Self collimation, extremely and damaging refraction, moment harmonic iteration, mirage and invisibility results which bring about an extraordinary keep an eye on of sunshine propagation on the (sub-)wavelength scale for the sphere of built-in nanophotonics are designated and commented upon.
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Extra info for Dispersion Engineering for Integrated Nanophotonics
The question remains open. 2. Parameter extraction from photonic crystals This preliminary discussion using a “homogenous” material already shows the difficulty of reaching the appropriate conditions for perfect focusing. Using photonic crystals, and especially a negative refraction regime within the second pass-band (as explained in Chapter 1), the situation becomes more complex since we have to ask ourselves: is the use of effective parameters pertinent under such operating conditions? Is sub-wavelength resolution a realistic target?
Up until now, it has seemed difficult to evaluate the effective permittivity and permeability, even if some results have shown that some fundamental properties persist between the homogenization and the diffraction regimes. Despite this fundamental problem, negative refraction in PhC can also be understood with the analysis of EFCs. However, several levels of interpretation are required to catch the real physics behind negative refraction in PhCs. A. Negative refraction in metamaterials Let us recall the essential physics of electromagnetic waves in metamaterials presenting both negative and .
Interface engineering: illustration of the use of anti-reflection coatings to optimize transmission efficiency through the photonic crystal based flat lens Therefore, many of the proposals which can be found in the literature propose to realize this transition on the first row of the lens, using for example elliptical or conical holes instead of circular ones. However, in these cases, transmission efficiency is merely optimized just for one incidence, normal or oblique as a 50 Dispersion Engineering for Integrated Nanophotonics function of the chosen design (direction of the big axes of the ellipses or cones forming the first row).