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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 18 — Jun. 20, 2004
  • pp: 3632–3639

Optical properties of porous helical thin films

Andy C. van Popta, Jeremy C. Sit, and Michael J. Brett  »View Author Affiliations


Applied Optics, Vol. 43, Issue 18, pp. 3632-3639 (2004)
http://dx.doi.org/10.1364/AO.43.003632


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Abstract

Porous dielectric thin films, composed of isolated helical columns, are fabricated by the glancing angle deposition technique. The selective reflection of circularly polarized light and the optical rotation of linearly polarized light are investigated as a function of film material and helical morphology. The strongest chiral optical response is observed for titanium-dioxide films because of its large refractive index. Optical rotatory powers as high as 4.5° are observed in 830-nm-thick helical films. By tailoring the pitch of the helical columns, the wavelength dependence of the circular reflection band is tuned to preferentially reflect red, green, or blue light, a promising quality for display applications.

© 2004 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(230.3720) Optical devices : Liquid-crystal devices
(230.4000) Optical devices : Microstructure fabrication
(240.0310) Optics at surfaces : Thin films
(310.1860) Thin films : Deposition and fabrication
(310.6860) Thin films : Thin films, optical properties

History
Original Manuscript: October 3, 2003
Revised Manuscript: March 30, 2004
Published: June 20, 2004

Citation
Andy C. van Popta, Jeremy C. Sit, and Michael J. Brett, "Optical properties of porous helical thin films," Appl. Opt. 43, 3632-3639 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-18-3632

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