Abstract

We discuss the design and fabrication of coatings that are antireflecting for p-polarized light at normal incidence and are purposely reflecting for s-polarized light. A single birefringent material, such as obliquely deposited zirconium oxide, forms the layers of the coating. Typical experimental results for a six-layer zirconium oxide anisotropic antireflection coating are Rp=0.2% and Rs=4.9%. Potential applications of the coatings include polarization-selection devices for lasers.

© 1998 Optical Society of America

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References

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  1. J. A. Dobrowolski, in Handbook of Optics, M. Bass, ed. (McGraw-Hill, New York, 1995), Vol. 1, Chap. 42.
  2. I. J. Hodgkinson and Q. H. Wu, Birefringent Thin Films and Polarizing Elements (World Scientific, Singapore, 1997).
    [CrossRef]
  3. The anisotropic antireflection coating is covered by a provisional patent: University of Otago, “Anisotropic antireflection coating,” (New Zealand patent applied for September 26, 1997).
  4. I. J. Hodgkinson and Q. H. Wu, Appl. Opt. 37, 2653 (1998).
    [CrossRef]

1998

1997

I. J. Hodgkinson and Q. H. Wu, Birefringent Thin Films and Polarizing Elements (World Scientific, Singapore, 1997).
[CrossRef]

1995

J. A. Dobrowolski, in Handbook of Optics, M. Bass, ed. (McGraw-Hill, New York, 1995), Vol. 1, Chap. 42.

Dobrowolski, J. A.

J. A. Dobrowolski, in Handbook of Optics, M. Bass, ed. (McGraw-Hill, New York, 1995), Vol. 1, Chap. 42.

Hodgkinson, I. J.

I. J. Hodgkinson and Q. H. Wu, Appl. Opt. 37, 2653 (1998).
[CrossRef]

I. J. Hodgkinson and Q. H. Wu, Birefringent Thin Films and Polarizing Elements (World Scientific, Singapore, 1997).
[CrossRef]

Wu, Q. H.

I. J. Hodgkinson and Q. H. Wu, Appl. Opt. 37, 2653 (1998).
[CrossRef]

I. J. Hodgkinson and Q. H. Wu, Birefringent Thin Films and Polarizing Elements (World Scientific, Singapore, 1997).
[CrossRef]

Appl. Opt.

Other

J. A. Dobrowolski, in Handbook of Optics, M. Bass, ed. (McGraw-Hill, New York, 1995), Vol. 1, Chap. 42.

I. J. Hodgkinson and Q. H. Wu, Birefringent Thin Films and Polarizing Elements (World Scientific, Singapore, 1997).
[CrossRef]

The anisotropic antireflection coating is covered by a provisional patent: University of Otago, “Anisotropic antireflection coating,” (New Zealand patent applied for September 26, 1997).

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Figures (5)

Fig. 1
Fig. 1

Left, basic AAR coating fabricated from tilted-columnar birefringent films (shown with hatching) and represented symbolically by a(P2S1)Ng. Incident light with p polarization encounters quarter-wave films with refractive indices np2 and ns1 that satisfy a condition for zero reflectance; s-polarized light sees refractive indices ns2 and np1 and is partially reflected. Right, special case of an AAR coating in which the layers have a common deposition angle. The symbolic designation is aPSNg.

Fig. 2
Fig. 2

Calculated spectral reflectance of a zirconium oxide basic a(P2S1)Ng AAR design. The coating parameters are na=1, ng=1.53,N=3,θv1=48.5°, and θv2=60°.

Fig. 3
Fig. 3

Calculated spectral reflectance of the zirconium oxide AAR coating deposited according to the modified design with θv1=60° and θv2=65°. The modification yields a larger difference Rs-Rp at the expense of a nonzero Rp.

Fig. 4
Fig. 4

Refractive-index profile of the zirconium oxide AAR coating with the modified design.

Fig. 5
Fig. 5

Monitor traces recorded during the deposition of a three-period modified-design zirconium oxide AAR coating (sample 1). The deposition angles were 60° and 65°, and the substrate was rotated about a normal axis by 90° between layers.

Equations (8)

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MˆLH=-nH/nL00-nL/nH,
r=nanH/nL-ngnL/nHnanH/nL+ngnL/nH.
nH/nL=ng/na1/2.
MˆLHN=-nH/nLN00-nL/nHN,
nH/nL=ng/na1/2N
ns1/np2=ng/na1/2N.
ns1=C0+C2θv12,
θv1=np2ng/na1/2N-C0/C21/2.

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