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Download Dispersion Engineering for Integrated Nanophotonics by Olivier Vanbésien, Emmanuel Centeno PDF

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By Olivier Vanbésien, Emmanuel Centeno

This publication exhibits how dispersion engineering in dimensional dielectric photonic crystals promises new results for the best 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 techniques to experimental demonstration through nanofabrication issues. Self collimation, extremely and damaging refraction, moment harmonic new release, mirage and invisibility results which bring about an unparalleled keep an eye on of sunshine propagation on the (sub-)wavelength scale for the sphere of built-in nanophotonics are particular and commented upon.

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Before exposing, in detail, the full process (design, fabrication, characterization) of an “n = -1” photonic crystal based flat lens, a short recap of the effective parameters used to macroscopically describe the material properties will help us to identify precisely how they can be tailored. 1. Effective parameters Usually, two sets of parameters can be used to define a material either electromagnetically or optically. In electromagnetism, the permittivity () – permeability (µ) couple, in general frequency dependent and expressed using Drude or Lorentz laws, is used to solve Maxwell’s equations.

This can be done by inserting a defect (absence of hole) at input just in front of the injection waveguide, or three defects distributed in front of the waveguide throughout the lens to recover a symmetrical device. By doing this, it means that a resolution of about 670 nm for an input waveguide width of 600 nm can be obtained which can be optimized to 600 nm for a 400 nm waveguide width. 4, below the Rayleigh limit. Let us note that no difference is found for the spot amplitude with or without the defects, clearly showing that the initial central beam is shared between the two satellite beams when the defects are present.

2. Negative refraction based flat lenses If photonic crystals had primarily been studied mainly for their band-gap properties, in which defects were later inserted to promote particular propagation modes, they are now also largely investigated for the diffraction or refraction properties of their pass-bands. Before exposing, in detail, the full process (design, fabrication, characterization) of an “n = -1” photonic crystal based flat lens, a short recap of the effective parameters used to macroscopically describe the material properties will help us to identify precisely how they can be tailored.

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