Synthetic opals made by the Langmuir–Blodgett method

Diffraction in the face centered cubic lattice cannot explain some minima observed in the transmission spectra of self-assembled opal films. Here, we compared them with minima observed in the transmission spectra of a hexagonal close packed monolayer of spheres of the same diameter. The identity of the sphere packing on the surface of the opal film and in the sphere monolayer was demonstrated by the light diffraction at the sample surfaces. It was shown that excitation of surface propagating modes in the opal film is responsible for the formation of additional minima in opal film transmission. (C) 2008 American Institute of Physics. (DOI: 10.1063/1.2920443

supporting

confidence: 54%

Understanding of transmission in the range of high-order photonic bands in thin opal film

Romanov¹,

Bardosova²,

Povey³

et al. 2008

“…The methods of particle treatment and LB film deposition have been described previously, 11 with the key parameters being a substrate withdrawal speed of 0.5 cm min −1 , surface pressures between 3 and 6 mN m −1 , and a barrier speed equivalent to 6 cm 2 min −1 .…”

mentioning

confidence: 99%

Enhanced Bragg reflections from size-matched heterostructure photonic crystal thin films prepared by the Langmuir-Blodgett method

Bardosova

Pemble

Povey

et al. 2006

The Langmuir-Blodgett method was used to engineer photonic crystal thin films of an AB architecture. Structures were studied by transmittance and reflectance spectroscopies. For an AB structure in which the silica particle diameter B is twice that of A, reflectance features associated with the first order Bragg peak for the "A" domain are only observed when the structure is probed from the A side of the structure. Furthermore, this feature is enhanced in intensity compared to that for a structure consisting solely of A particles. These findings are attributed to a matching of first and second order Bragg processes. (c) 2006 American Institute of Physics. (DOI:10.1063/1.2339031

“…[6][7][8] The reported optical studies of LB multilayers dealt with wavelengths, which are larger than the sphere diameter by a factor of 2. Moreover, no spectroscopic evidence has been demonstrated to prove the formation of a 3D lattice in LB multilayers.…”

mentioning

confidence: 99%

“…12 A low barrier speed of 6 cm 2 / min and pressure of 4 mN/ m were used for the monolayer compression. LB monolayers of spheres crystallize in a hexagonal lattice.…”

mentioning

confidence: 99%

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( 2 + 1 ) -dimensional photonic crystals from Langmuir-Blodgett colloidal multilayers

Romanov¹,

Bardosova²,

Pemble³

et al. 2006