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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 13 — May. 1, 1998
  • pp: 2653–2659

Empirical equations for the principal refractive indices and column angle of obliquely deposited films of tantalum oxide, titanium oxide, and zirconium oxide

Ian Hodgkinson, Qi hong Wu, and Judith Hazel  »View Author Affiliations


Applied Optics, Vol. 37, Issue 13, pp. 2653-2659 (1998)
http://dx.doi.org/10.1364/AO.37.002653


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Abstract

Values of the transmittance T s and the phase retardation Δ were recorded in situ at two angles during the growth of thin films of tantalum oxide, titanium oxide, and zirconium oxide for deposition angles θ ν in the range 40°–70°. Column angles for the same films were determined ex situ from scanning electron microscopy photographs of deposition-plane fractures. We show that the experimental column angles are smaller than the corresponding values predicted by the tangent-rule equation ψ = tan-1(0.5 tan θ ν ) and that the experimental values fit a modified form of the equation ψ = tan-1 (E1 tan θ ν ) where E1 is less than 0.5. We also show that the principal refractive indices are represented well by quadratic functions of the deposition angle, for example, n1 ν ) = A0 + A2 θ ν 2.

© 1998 Optical Society of America

OCIS Codes
(260.1440) Physical optics : Birefringence
(310.0310) Thin films : Thin films
(310.1620) Thin films : Interference coatings

History
Original Manuscript: August 26, 1997
Revised Manuscript: December 1, 1997
Published: May 1, 1998

Citation
Ian Hodgkinson, Qi hong Wu, and Judith Hazel, "Empirical equations for the principal refractive indices and column angle of obliquely deposited films of tantalum oxide, titanium oxide, and zirconium oxide," Appl. Opt. 37, 2653-2659 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-13-2653

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