Waveguide Fresnel lens with multiple phase shifts

Michele A. Forastiere; Zbigniew Jaroszewicz; Giancarlo C. Righini; Jacek L. Sochacki; Leszek Rafal Staronski

doi:10.1117/12.185159

25 August 1994 Waveguide Fresnel lens with multiple phase shifts

Michele A. Forastiere, Zbigniew Jaroszewicz, Giancarlo C. Righini, Jacek L. Sochacki, Leszek Rafal Staronski

Proceedings Volume 2212, Linear and Nonlinear Integrated Optics; (1994) https://doi.org/10.1117/12.185159
Event: Integrated Optoelectronics '94, 1994, Lindau, Germany

Abstract

Waveguide lenses continue to attract great attention due to their importance as basic elements of many signal-processing integrated optical circuits and interconnecting devices. Here we analyze a novel diffractive lens structure, namely a waveguide Fresnel lens with phase shifts between neighboring zones which are a multiple value of 2(pi) ; it has been shown that the analog Fresnel lens and the refractive lenses can be considered as limiting cases of this more general lens element. the possibility of varying the phase shift by an integer multplicative factor introduces additional flexibility into the lens design as well as less stringent requirements into the fabrication process. A specific design has been produces of a lens with aperture 2.83 nm and focal length 10 mm, to be fabricated in glass waveguides. A hybrid modeling tool, based on ray tracing and Huygens-Fresnel integral, has been first used to check the performance of such a lens. Our further simulation tests, carried out using a BPM-based computer program, have confirmed that by neglecting the finite length of the lens, one introduces focal shifts and a decrease in the diffraction efficiency; the infinitesimal-length approximation can be tolerated only in the case of optical system with large F-number.

Citation Download Citation

Michele A. Forastiere, Zbigniew Jaroszewicz, Giancarlo C. Righini, Jacek L. Sochacki, and Leszek Rafal Staronski "Waveguide Fresnel lens with multiple phase shifts", Proc. SPIE 2212, Linear and Nonlinear Integrated Optics, (25 August 1994); https://doi.org/10.1117/12.185159

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