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Proceedings Paper

Waveguide Fresnel lens with multiple phase shifts
Author(s): Michele A. Forastiere; Zbigniew Jaroszewicz; Giancarlo C. Righini; Jacek L. Sochacki; Leszek Rafal Staronski
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Paper 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.

Paper Details

Date Published: 25 August 1994
PDF: 12 pages
Proc. SPIE 2212, Linear and Nonlinear Integrated Optics, (25 August 1994); doi: 10.1117/12.185159
Show Author Affiliations
Michele A. Forastiere, IROE/CNR (Italy)
Zbigniew Jaroszewicz, Univ. de Santiago de Compostela (Poland)
Giancarlo C. Righini, IROE/CNR (Italy)
Jacek L. Sochacki, Instytut Optyki Stosowanej (Poland)
Leszek Rafal Staronski, Univ. de Santiago de Compostela (Poland)

Published in SPIE Proceedings Vol. 2212:
Linear and Nonlinear Integrated Optics
Giancarlo C. Righini; David Yevick, Editor(s)

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