Colour of Precious Opal

Sanders, J. V.

doi:10.1038/2041151a0

Cited by 361 publications

(257 citation statements)

References 5 publications

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“…Colloids have the natural ability to spontaneously form three dimensional face-centered cubic (fcc) crystals [27], and are therefore suitable for the production of thick three dimensional photonic crystals. While the photonic strength of self-assembled colloidal crystals is rather low, the colloids can be made to form opals [28] that serve as a template for high-strength inverse opals, see Fig. 1.3A [29][30][31] While the refractive index contrast in titania inverse opals (2.7±0.4) marginally fulfills the requirement for band gap formation, the crystals were observed to show omnidirectional reflectivity features [32].…”

Section: Photonic Band Gap Crystalsmentioning

confidence: 99%

Ultrafast optical switching of photonic crystals

Guina¹,

Suomalainen²,

Kalkman

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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Section: Photonic Band Gap Crystalsmentioning

confidence: 99%

Ultrafast optical switching of photonic crystals

Guina¹,

Suomalainen²,

Kalkman

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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“…Due to the large size of the particles, a rich variety of experiments can be easily performed. Optical measurements show that some suspensions, such as the opals [1] and the viruses [2], form regular lattices that can, in principle, exhibit melting and structural phase transitions [3,4]. The elastic rigidity of these ordered structures leads to unusual viscoelastic properties.…”

Section: Introductionmentioning

confidence: 99%

Donnan equilibrium and the osmotic pressure of charged colloidal lattices

1998

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We consider a system composed of a monodisperse charge-stabilized colloidal suspension in the presence of monovalent salt, separated from the pure electrolyte by a semipermeable membrane, which allows the crossing of solvent, counterions, and salt particles, but prevents the passage of polyions. The colloidal suspension, that is in a crystalline phase, is considered using a spherical Wigner-Seitz cell. After the Donnan equilibrium is achieved, there will be a difference in pressure between the two sides of the membrane. Using the functional density theory, we obtained the expression for the osmotic pressure as a function of the concentration of added salt, the colloidal volume fraction, and the size and charge of the colloidal particles. The results are compared with the experimental measurements for ordered polystyrene lattices of two different particle sizes over a range of ionic strengths and colloidal volume fractions.

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“…The ultrastructure of opal was originally revealed in 1964 as a square or more usually hexagonally close packed array of spheres approximately 250 nm in diameter (Sanders 1964). Many Australian fossils have become opalized, particularly those from the Late Cretaceous period, ca 110 Ma (e.g.…”

Section: (D ) Weevils Containing 'Opal'mentioning

confidence: 99%

Natural photonics for industrial inspiration

Parker

2009

Phil. Trans. R. Soc. A.

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There are two considerations for optical biomimetics: the diversity of submicrometre architectures found in the natural world, and the industrial manufacture of these. A review exists on the latter subject, where current engineering methods are considered along with those of the natural cells. Here, on the other hand, I will provide a modern review of the different categories of reflectors and antireflectors found in animals, including their optical characterization. The purpose of this is to inspire designers within the $2 billion annual optics industry.

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Colour of Precious Opal

Cited by 361 publications

References 5 publications

Ultrafast optical switching of photonic crystals

Ultrafast optical switching of photonic crystals

Donnan equilibrium and the osmotic pressure of charged colloidal lattices

Natural photonics for industrial inspiration

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