Graded photonic crystals

Centeno, Emmanuel; Cassagne, D.

doi:10.1364/ol.30.002278

Cited by 120 publications

(61 citation statements)

References 22 publications

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“…This could be further combined with the layer-by-layer procedure described above to create a photonic material that has a smoothly varying lattice constant through the material, forming a graded photonic material that can be utilized to bend light in complex paths. [148] A related application is the creation of phononic materials. These acoustic metamaterials have a phonon bandgap analogous to the photon bandgap of photonic crystals, making them useful as filters for both sound and thermal energy.…”

Section: Prospective Articlesmentioning

confidence: 99%

Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

et al. 2013

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Over the past three decades, the combination of inorganic-nanoparticles and organic-polymers has led to a wide variety of advanced materials, including polymer nanocomposites (PNCs). Recently, synthetic innovations for attaching polymers to nanoparticles to create "hairy nanoparticles" (HNPs) has expanded opportunities in this field. In addition to nanoparticle compatibilization for traditional particle-matrix blending, neat-HNPs afford one-component hybrids, both in composition and properties, which avoids issues of mixing that plague traditional PNCs. Continuous improvements in purity, scalability, and theoretical foundations of structure-performance relationships are critical to achieving design control of neat-HNPs necessary for future applications, ranging from optical, energy, and sensor devices to lubricants, green-bodies, and structures.

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Section: Prospective Articlesmentioning

confidence: 99%

Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

et al. 2013

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“…Excellent performance can even be obtained using materials with low dielectric constant (i.e., ε r < 3.0) that are usually less expensive and more commonly available than more exotic dielectrics with higher permittivity. Alternative techniques for spatial control of waves within a lattice include structures produced by transformation optics [45], waveguides [46,47], graded-index devices [48][49][50], introduction of defects [43], and graded photonic crystals [51][52][53][54][55]. Spatially-variant self-collimation is unique because it spatially varies the orientation of the unit cells within an otherwise monolithic and uniform lattice.…”

Section: Introductionmentioning

confidence: 99%

3d Printed Lattices With Spatially Variant Self-Collimation

Rumpf¹,

Pazos²,

Garcia³

et al. 2013

PIER

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Abstract-In this work, results are given for controlling waves arbitrarily inside a lattice with spatially variant self-collimation. To demonstrate the concept, an unguided beam was made to flow around a 90 • bend without scattering due to the bend or the spatial variance. Control of the field was achieved by spatially varying the orientation of the unit cells throughout a self-collimating photonic crystal, but in a manner that almost completely eliminated deformations to the size and shape of the unit cells. The device was all-dielectric, monolithic, and made from an ordinary dielectric with low relative permittivity (ε r = 2.45). It was manufactured by fused deposition modeling, a form of 3D printing, and its performance confirmed experimentally at around 15 GHz.

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“…A novel kind of heterogeneous media called as graded-index (GRIN) PCs has been introduced recently to enhance possibilities for controlling the flow of light [11,12]. GRIN PCs are a valuable choice when designing GRIN-media.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis of two different graded-index photonic-crystal lenses

Gharaati¹,

Miri²

2017

Ukr. J. Phys. Opt.

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Abstract:We investigate two alternative approaches for implementing graded-index (GRIN) photonic-crystal (PC) structures that reveal a focusing effect. Gradient of the refractive index is achieved either using a symmetry-reduction approach (a structure of type I) or varying a filling fraction of PC elements (a structure of type II). We test the first structure for the frequencies located inside the first and second bands of the dispersion diagram. The focusing effect of the first structure characteristic for the frequencies located above the bandgap is stronger than that for the frequencies below the bandgap. It is demonstrated that variations of filling fractions of the elliptical air holes in the structure of type II produce a GRIN lens that manifests a pronounced focusing effect. We have also compared the focusing effects of the latter structure for the TE and TM polarizations. The both structures suggested in the present work can work in a broad enough band region.

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Graded photonic crystals

Cited by 120 publications

References 22 publications

Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

3d Printed Lattices With Spatially Variant Self-Collimation

Comprehensive analysis of two different graded-index photonic-crystal lenses

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