Circularly polarized luminescence from chiral thin films

Bryan Szeto; Peter C. P. Hrudey; Mike Taschuk; Michael J. Brett

doi:10.1117/12.646452

23 February 2006 Circularly polarized luminescence from chiral thin films

Bryan Szeto, Peter C. P. Hrudey, Mike Taschuk, Michael J. Brett

Proceedings Volume 6135, Liquid Crystal Materials, Devices, and Applications XI; 613511 (2006) https://doi.org/10.1117/12.646452
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

Photoluminescent nanostructured thin films have been fabricated using physical vapour deposition and the glancing angle deposition (GLAD) technique. Precision controlled substrate motion and oblique incidence (>75^o) enable the fabrication of a variety of 3-D morphologies including vertical posts, helical (chiral) columns and chevrons. Scanning electron microscopy and X-ray diffraction were used to characterize the film nanostructure. These experiments focussed on the chiral morphology which exhibits intriguing polarization behaviour such as selective transmission of circularly polarized light and circularly polarized photoluminescence. Helical films of Y₂O₃:Eu and Alq₃ were fabricated with thicknesses in excess of 2 μm and densities nominally 60% of bulk. Transmission spectroscopic ellipsometry measurements were used to determine the degree of selective transmission of polarized light through the samples. The degree of circular polarization for the photoluminescent light emitted from helical films was measured with the use of a quarter waveplate and linear polarizer. Polarized photoluminescence efficiencies were consistent with the observed selective transmission of circularly polarized light through the films. The use of GLAD to control the nanoscale morphology of the films allows for the spectral location and strength of these polarization effects to be easily and accurately selected.

Citation Download Citation

Bryan Szeto, Peter C. P. Hrudey, Mike Taschuk, and Michael J. Brett "Circularly polarized luminescence from chiral thin films", Proc. SPIE 6135, Liquid Crystal Materials, Devices, and Applications XI, 613511 (23 February 2006); https://doi.org/10.1117/12.646452

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