| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 4, 2009
|
|
|---|---|---|
| Article Number | 09033 | |
| Number of page(s) | 7 | |
| DOI | https://doi.org/10.2971/jeos.2009.09033 | |
| Published online | 23 June 2009 | |
Regular papers
Tuning optical properties of opal photonic crystals by structural defects engineering
1
Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, via Dodecaneso 31, 16146 Genova (Italy)
2
Dipartimento di Scienza dei Materiali e INSTM, Università di Milano-Bicocca, via Cozzi 53, 20125 Milano (Italy)
Received:
11
December
2008
We report on the preparation and optical characterization of three dimensional colloidal photonic crystal (PhC) containing an engineered planar defect embedding photoactive push-pull dyes. Free standing polystyrene films having thickness between 0.6 and 3 µm doped with different dipolar chromophores were prepared. These films were sandwiched between two artificial opals creating a PhC structure with planar defect. The system was characterized by reflectance at normal incidence angle (R), variable angle transmittance (T) and photoluminescence spectroscopy (PL) Evidence of defect states were observed in T and R spectra which allow the light to propagate for selected frequencies within the pseudogap (stop band).
Key words: photonic crystals / dipolar chromophores / artificial opals
© The Author(s) 2009. All rights reserved.
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