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.
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The authors would like to acknowledge the financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Alberta Informatics Circle of Research Excellence (iCORE), and Micralyne Inc. The authors would also like to thank George Braybrook for the exceptional SEM imaging and the University of Alberta Micromachining and Nanofabrication Facility.
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Sorge, J.B., van Popta, A.C., Sit, J.C. et al. Effects of Deposition Angle on the Optical Properties of Helically Structured Films. MRS Online Proceedings Library 846, 1017 (2004). https://doi.org/10.1557/PROC-846-DD10.17