Photonic band engineering through tailored microstructural order

Ballato, John; DiMaio, Jeffrey R.; James, Andrew; Gulliver, Eric A.

doi:10.1063/1.124734

Cited by 36 publications

(32 citation statements)

References 7 publications

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“…Some examples of not-completely-disordered systems can be found in the literature, [30] where traces of order reveal the invalidity of applying a mechanical method to obtain random arrangements of spheres. The water evaporation process and, in particular, surface tension are what force the spheres to selfassemble in an ordered fashion and it is this process that should be prevented.…”

Section: Progress Reportmentioning

confidence: 99%

Photonic Glasses: A Step Beyond White Paint

2009

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Self-assembly techniques are widely used to grow ordered structures such as, for example, opal-based photonic crystals. Here, we report on photonic glasses, new disordered materials obtained via a modified self-assembling technique. These random materials are solid thin films which exhibit rich novel light diffusion properties originating from the optical properties of their building blocks. This novel material inaugurated a wide range of nanophotonic materials with fascinating applications, such as resonant random lasers or Anderson localization.

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Section: Progress Reportmentioning

confidence: 99%

Photonic Glasses: A Step Beyond White Paint

2009

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“…Lattice periodicity or long-range order is not required, and thus many amorphous semiconductors display large electronic band gaps. PBGs also exist in amorphous photonic structures that consist of strong Mie scatterers such as dielectric rods or spheres [6][7][8][9][10]. These structures are termed photonic glasses [11], in analogy to glassy silica, which has an electronic band gap spanning the entire visible frequency range.…”

Section: Introductionmentioning

confidence: 99%

Photonic-band-gap effects in two-dimensional polycrystalline and amorphous structures

et al. 2010

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We study numerically the density of optical states (DOS) in two-dimensional photonic structures with short-range positional order and observe a transition from polycrystalline to amorphous photonic systems. In polycrystals, photonic band gaps (PBGs) are formed within individual domains, which leads to a depletion of the DOS similar to that in periodic structures. In amorphous photonic media, the domain sizes are too small to form PBGs, thus the depletion of the DOS is weakened significantly. The critical domain size that separates the polycrystalline and amorphous regimes is determined by the attenuation length of Bragg scattering, which depends not only on the degree of positional order but also the refractive-index contrast of the photonic material. Even with relatively low-refractive-index contrast, we find that modest short-range positional order in photonic structures enhances light confinement via collective scattering and interference.

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“…10 On the other hand, the photonic properties of colloidal glasses have hardly been studied. 11 This is despite the fact that it was suggested earlier that randomly distributed metal particles in a dielectric host may be a suitable system to study light localization. 12 The experimental study of metallodielectric systems with short-range order will give an important contribution toward understanding how photonic properties of crystals are affected by disorder.…”

Section: Introductionmentioning

confidence: 69%

Reflectivity of metallodielectric photonic glasses

et al. 2004

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We report on the fabrication and optical properties of metallodielectric photonic glasses of colloidal silver spheres with a radius ranging from 200 to 420 nm and volume fractions around 60%. Strong modulations (ϳ25%) in the optical reflectivity were observed in the visible range for these structures, despite the presence of only short-range order. Despite the strong wavelength dependence of silver dielectric constant, the spectral positions of the optical reflection peaks, with the exception of the smallest size ͑200 nm͒, scale linearly with the particle radius. For the smallest particle size studied, a peak at longer wavelengths related to a lower order gap was observed. Remarkably, the general features in the reflectivity spectra have a qualitative similarity to spectra calculated for light incident on ͑111͒ oriented face-centered-cubic ͑fcc͒ crystals.

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Photonic band engineering through tailored microstructural order

Cited by 36 publications

References 7 publications

Photonic Glasses: A Step Beyond White Paint

Photonic Glasses: A Step Beyond White Paint

Photonic-band-gap effects in two-dimensional polycrystalline and amorphous structures

Reflectivity of metallodielectric photonic glasses

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