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Effects of Deposition Angle on the Optical Properties of Helically Structured Films

Published online by Cambridge University Press:  01 February 2011

Jason B. Sorge ,
Andy C. van Popta ,
Jeremy C. Sit  and
Michael J. Brett
Jason B. Sorge
Affiliation:
Department of Electrical and Computer Engineering, University of Alberta Edmonton, Alberta, T6G 2V4, Canada
Andy C. van Popta
Affiliation:
Department of Electrical and Computer Engineering, University of Alberta Edmonton, Alberta, T6G 2V4, Canada
Jeremy C. Sit
Affiliation:
Department of Electrical and Computer Engineering, University of Alberta Edmonton, Alberta, T6G 2V4, Canada
Michael J. Brett
Affiliation:
Department of Electrical and Computer Engineering, University of Alberta Edmonton, Alberta, T6G 2V4, Canada
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Abstract

Glancing-angle deposition (GLAD) is a fabrication method capable of producing thin films with variable porosity. The GLAD process exploits substrate shadowing and limited adatom diffusion to create isolated columns of material that collectively comprise a highly porous thin film. GLAD can be used to create chiral or helical structures with a wide range of porosity through variation of the substrate tilt angle and controlled substrate rotation. We present the effect of the deposition angle on the selective transmittance of circularly polarized light in helical thin films fabricated with the GLAD process. Transmission measurements of titanium dioxide helical films reveal two regimes of enhanced selective transmittance: one corresponding to a substrate tilt angle that produces a maximum circular birefringence and another corresponding to strong anisotropic scattering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 846: Symposium DD – Organic and Nanocomposite Optical Materials , 2004 , DD10.17
Copyright
Copyright © Materials Research Society 2005

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References

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