| Download | - View final version: Optical and structural characterization of nanostructured Alq₃ with negative in-plane birefringence (PDF, 603 KiB)
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| Author | Search for: Szeto, Bryan; Search for: Hrudey, Peter C. P.; Search for: Gospodyn, James; Search for: Sit, Jeremy C.; Search for: Brett, Michael J. |
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| Sponsor | Search for: National Research Council of Canada |
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| Format | Text, Article |
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| Conference | 2007 NSTI Nanotechnology Conference and Trade Show, May 20-24, 2007, Santa Clara, California, United States |
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| 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. |
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| Publication date | 2007-05-24 |
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| Publisher | Tech Connect Briefs |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | 434
NRC-NINT-434 |
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| NPARC number | 8926277 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | f520d05b-8ab4-49fe-a7a9-1c41ed8e1c00 |
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| Record created | 2009-04-23 |
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| Record modified | 2022-09-15 |
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