Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1981-10-05
1984-05-01
Lee, John D.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
350452, 204192N, 156654, G02B 5174
Patent
active
044457596
ABSTRACT:
Fresnel lens for integrated optics, wherein it comprises a light guide of effective index n.sub.eff incorporating a guiding layer and a number N of regions of length L(r) measured in the direction of the lens axis as a function of the distance r from the lens axis and disposed in the direction perpendicular to the lens axis, while having a refractive index such that to the right of these regions the effective index of the light guide has a value n'.sub.eff which differs from n.sub.eff in such a way that a light wave propagated to the right of these regions is given a phase displacement .DELTA..phi. due to the effective index difference n'.sub.eff -n.sub.eff and making it possible to obtain constructive light interferences at the chosen image point. The invention also relates to a process for producing a Fresnel lens in which the regions are produced by ion implantation.
REFERENCES:
patent: 4367916 (1983-01-01), Mottier et al.
Wei et al., "Large Refractive Index Change Induced by Ion Implantation . . . ," Appl. Phys. Lett., vol. 25, No. 6, Sep. 1974, pp. 329-331.
Ashley et al., "Fresnel Lens in a Thin-Film Waveguide," Appl. Phys. Lett., vol. 33, No. 6, Sep. 1978, pp. 490-492.
Chang et al., "Fresnel Lenses in Optical Waveguides," IEEE J.Q.E., vol. QE-16, No. 7, Jul. 1980, pp. 744-754.
Commissariat a l''Energie Atomique
Lee John D.
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