Letter abstract
Nature Materials 5, 179 - 184 (2006)
doi:10.1038/nmat1588
Subject Categories: Polymers | Optical, photonic and optoelectronic materials
From colour fingerprinting to the control of photoluminescence in elastic photonic crystals
André C. Arsenault1, Timothy J. Clark1, Georg von Freymann1,2,4, Ludovico Cademartiri1, Riccardo Sapienza3, Jacopo Bertolotti3, Evangellos Vekris1, Sean Wong1, Vladimir Kitaev1,5, Ian Manners1, R. Z. Wang2, Sajeev John2, Diederik Wiersma3 and Geoffrey A. Ozin1
In photonic crystals (PCs), strong scattering and destructive wave interference lead to a modification of the photon density of states in particular energy regions and along certain crystallographic directions1, 2. The consequences of this range from suppression and enhancement of luminescence3, 4, 5, 6, 7 to narrow-band bright reflections useful for colour sensors8, 9, displays10 and tuneable filters11, 12, 13, 14. Here we demonstrate large-area films of porous elastomeric photonic crystals (EPCs) that are compressively–decompressively cycled to reversibly shift the position of the photonic band structure over a large wavelength range. Owing to their low compressive threshold, such porous EPCs can be used for imaging that is pressure and time sensitive, for example, to obtain colour fingerprints with high accuracy. Furthermore, by incorporating luminescent PbS quantum dots in the EPCs, the photonic stop-gap can be tuned through the near-infrared (NIR) quantum dot photoluminescence (PL) peak. Thereby we demonstrate a tuneable modification of photonic characteristics, including the suppression and enhancement in emission and dynamic modification of luminescence lifetimes.
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
- Department of Physics, University of Toronto, 60 St. George Street, Toronto M5S 1A7, Canada
- European Laboratory for Non-linear Spectroscopy and INFM-Matis, via Nello Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy
- Present address: Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 76021 Karlsruhe, Germany
- Present address: Department of Chemistry, Wilfred Laurier University, 75 University Avenue West, Waterloo N2L 3C5, Canada
Correspondence to: André C. Arsenault1 e-mail: aarsenau@chem.utoronto.ca
Correspondence to: Geoffrey A. Ozin1 e-mail: gozin@chem.utoronto.ca
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