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Your search keyword '"Hrudey, Peter C. P."' showing total 13 results
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13 results on '"Hrudey, Peter C. P."'

1. Optical and structural characterization of nanostructured Alq₃ with negative in-plane birefringence

Author

Szeto, Bryan, Hrudey, Peter C. P., Gospodyn, James, Sit, Jeremy C., Brett, Michael J., and National Research Council of Canada

Subjects
Condensed Matter::Materials Science, Condensed Matter::Superconductivity, Physics::Optics
Abstract

In this study, we investigate the optical and structural properties of tilted columnar thin films composed of Alq₃ in order to better understand the source of the in-plane birefringence exhibited by such films which is critical in designing and modelling nanostructured devices incorporating porous architectures such as photonic crystals (ie: square spiral structure), rugate filters, and polarized light emitting devices. Previous work done on chiral Alq₃ films have demonstrated a notable absence of column broadening and secondary structural anisotropy (asymmetric fanning of columns) commonly observed in inorganic films. In addition, strong chiral optical behaviour is observed in Alq₃ helical films dependent on the deposition angle. The magnitude of circular Bragg reflection (preferential reflection of one handedness of circular polarized light) of chiral thin films is related to the in-plane birefringence. This suggests that the in-plane birefringence of tilted columnar Alq3 films drives such behaviour and should increase with the deposition angle. This trend is contrary to the one observed in tilted columnar inorganic thin films which exhibit peak values of in-plane birefringence at deposition angles 60° < alpha < 70°.Variable angle spectroscopic ellipsometry, scanning electron microscopy, and the Bruggeman effective medium approximation description was used to characterized the films., 2007 NSTI Nanotechnology Conference and Trade Show, May 20-24, 2007, Santa Clara, California, United States

Published
2007

11. Strong circular Bragg phenomena in self-ordered porous helical nanorod arrays of Alq3.

Author

Hrudey, Peter C. P., Szeto, Bryan, and Brett, Michael J.

Subjects
*THIN films, *SOLID state electronics, *SURFACES (Technology), *LIQUID crystals, *LIGHT sources
Abstract

Porous chiral thin films composed of a nearly hexagonal-close-packed array of helical nanorods of tris-(8-hydroxyquinoline) aluminum (Alq3) are fabricated using glancing angle deposition and exhibit a one-dimensional polarization-dependent photonic stop band. These chiral thin films transmit only one handedness of circularly polarized light and emit highly circularly polarized photoluminescence. The strong circular Bragg phenomena exhibited by these films suggest potential for use of these films in low-threshold mirrorless lasing and circularly polarized emission applications, while the porosity of the films allows for infiltration by dyes or liquid crystals to enable the formation of unique hybrid materials. [ABSTRACT FROM AUTHOR]

Published
2006
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12. Strong circular Bragg phenomena in self-ordered porous helical nanorod arrays of Alq3.

Author

Hrudey, Peter C. P., Szeto, Bryan, and Brett, Michael J.

Subjects
THIN films, SOLID state electronics, SURFACES (Technology), LIQUID crystals, LIGHT sources
Abstract

Porous chiral thin films composed of a nearly hexagonal-close-packed array of helical nanorods of tris-(8-hydroxyquinoline) aluminum (Alq3) are fabricated using glancing angle deposition and exhibit a one-dimensional polarization-dependent photonic stop band. These chiral thin films transmit only one handedness of circularly polarized light and emit highly circularly polarized photoluminescence. The strong circular Bragg phenomena exhibited by these films suggest potential for use of these films in low-threshold mirrorless lasing and circularly polarized emission applications, while the porosity of the films allows for infiltration by dyes or liquid crystals to enable the formation of unique hybrid materials. [ABSTRACT FROM AUTHOR]

Published
2006
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13. Photoluminescence emission profiles of Y(2)O(3) : Eu films composed of high-low density stacks produced by glancing angle deposition.

Author

Gospodyn J, Taschuk MT, Hrudey PC, Tsui YY, Fedosejevs R, Brett MJ, and Sit JC

Abstract

Periodic high-/low-index film stacks composed of Y(2)O(3) : Eu were grown by glancing angle deposition on silicon and fused silica substrates. Postdeposition annealing at temperatures from 600 to 1000 degrees C for 1 h in air was performed to activate photoluminescence. Absolute photoluminescence spectra were obtained as a function of observation angle. The angular emission distribution was non-Lambertian, with peak emission at angles of 50 to 60 degrees with respect to substrate normal. Spectroscopic transmittance and ellipsometry measurements were performed to characterize the films. Using this description, we were able to reproduce the angular photoluminescence patterns of the films.

Published
2008
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