Optical performance of porous TiO2 chiral thin films

Andy C. van Popta; Scott R. Kennedy; Dirk J. Broer; Jeremy C. Sit; Michael J. Brett

doi:10.1117/12.506281

5 January 2004 Optical performance of porous TiO₂ chiral thin films

Andy C. van Popta, Scott R. Kennedy, Dirk J. Broer, Jeremy C. Sit, Michael J. Brett

Proceedings Volume 5213, Liquid Crystals VII; (2004) https://doi.org/10.1117/12.506281
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Porous thin film structures have been fabricated by physical vapor deposition at an incident flux angle that was typically greater than 80°. This deposition technique, often called glancing angle deposition (GLAD), was used to create thin films composed of isolated helical columns. Modification of the deposition parameters was used to control the porosity, the handedness, and the pitch of the helical structure. The high porosity of the GLAD film (>50%) permits fluids, and in particular liquid crystals (LC), to be incorporated into the voids of the nanostructure. We present the results of a study assessing the effect of film material, chiral morphology, and liquid crystalline material on the optical performance of helical GLAD films. Films fabricated from TiO₂, a high refractive index material, exhibited strong optical rotation of linearly polarized light and selective reflection of circularly polarized light. By increasing the number of turns of the helix the chiral optical response was enhanced, and by tailoring the pitch of the helical columns, the wavelength-dependence of the reflection band was tuned to preferentially reflect red, green, or blue light.

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Andy C. van Popta, Scott R. Kennedy, Dirk J. Broer, Jeremy C. Sit, and Michael J. Brett "Optical performance of porous TiO₂ chiral thin films", Proc. SPIE 5213, Liquid Crystals VII, (5 January 2004); https://doi.org/10.1117/12.506281

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KEYWORDS

Liquid crystals

Reflectivity

Thin films

Refractive index

Optical activity

Reflection

Spectrophotometry

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