Effects of the position of a chemically or size-induced planar defect on the optical properties of colloidal crystals

Masse, Pascal, Vallee, Renaud A. L., Dechezelles, Jean-Francois, Rosselgong, Julien, Cloutet, Eric, Cramail, Henri, Zhao, X. S. and Ravaine, Serge (2009) Effects of the position of a chemically or size-induced planar defect on the optical properties of colloidal crystals. Journal of Physical Chemistry C, 113 32: 14487-14492. doi:10.1021/jp903651m


Author Masse, Pascal
Vallee, Renaud A. L.
Dechezelles, Jean-Francois
Rosselgong, Julien
Cloutet, Eric
Cramail, Henri
Zhao, X. S.
Ravaine, Serge
Title Effects of the position of a chemically or size-induced planar defect on the optical properties of colloidal crystals
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2009-08-01
Year available 2009
Sub-type Article (original research)
DOI 10.1021/jp903651m
Open Access Status DOI
Volume 113
Issue 32
Start page 14487
End page 14492
Total pages 6
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Formatted abstract
We have fabricated several heterostructures made of two opal slabs separated by a defect. The optical properties of the resulting materials have been characterized by recording their near-infrared (NIR) transmission spectra and by simulating them using the finite-difference time-domain method. The presence of the extrinsic defect led to an impurity mode within the photonic stop band, which was observed as a pass band in the NIR spectra. We show that the amplitude of the pass band is maximal when the two opals confining a defect monolayer made of smaller colloids have the same number of layers. On the other hand, this middle position of the defect layer does not correspond to an optimal cavity when the guest particles are larger than the host ones, as the presence of the defect induces a deterioration of the crystalline organization of the upper opal slab. To minimize the presence of unintentional defects in the heterostructures, we incorporated a planar defect made of particles of a different nature but of the same size than those forming the host opal. A pass band within the band gap was also observed in the NIR transmission spectra of the samples due to the difference between the refractive indexes of the guest and host colloids. © 2009 American Chemical Society.
Keyword Polyurethane-Polydimethylsiloxane Particles
3-Dimensional Photonic Crystals
Refractive-Index
Dispersant Media
Spheres
Opal
Multilayers
Thickness
Films
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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