Interference filter design using flip-flop optimization

Details Interference filter design using flip-flop optimization Interference filter design using flip-flop optimization

1985-04-16

1987-05-19

Arnold, Bruce Y.

350320, G02B 528

Patent

active

046662502

ABSTRACT:
An antireflective optical film is placed between an incident media and a substrate to effect minimal reflectivity from the incident media-substrate interface over a broad spectral band. The film is designed by selecting a first material with a low refractive index and a second material with a high refractive index. A theoretical film is defined with a plurality of thin layers of equal thickness. The low refractive index or the high refractive index material is specified for each layer in the film. The reflectivity of the theoretical film is evaluated. The refractive index of one of the layers is changed to the alternate index and the reflectivity of the defined film is reevaluated. If the reflectivity of the film is improved, the alternate refractive index is assigned to the changed layer. The steps of changing, reevaluating, and assigning are repeated for each of the layers in the film until no further improvement in the reflectivity of the film is obtained. The thin layers may be defined with equal physical or optical thickness and should be substantially thinner than wavelengths within the spectral band to be reflected by the film. The initial refractive index profile may be defined with all of the layers having the low refractive index, all of the layers having the high refractive index, the layers having alternately low and high refractive indices, or such that the initial refractive index profile for the film approximates a predetermined gradient index profile.

REFERENCES:
Berning, Use of Equivalent Films in the Design of Infrared Multilayer Antirelection Coatings, Journal of the Optical Society of America, vol. 52, pp. 431-436, (1962).
Dobrowolski, Completely Automatic Synthesis of Optical Thin Film Systems, Applied Optics, vol. 4, p. 937 (1965).
Epstein, The Design of Optical Filters, Journal of the Optical Society of America, vol. 42, pp. 806-810 (1952).
Snedaker, New Numerical Thin-Film Synthesis Technique, Journal of the Optical Society of America, vol. 72, p. 1732 (1982).
Southwell, Gradient-Index Antireflection Coatings, Optics Letters, vol. 8, p. 584, (1983).
Yadava, et al., Optical Behavior of Gradient-Index Multilayer Films, Thin Solid Films, vol. 21, p. 297 (1974).

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