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Proceedings Paper

Design of a GaAs Fresnel lens array for optical signal-processing devices
Author(s): Mario Nicola Armenise; Fabrizio Impagnatiello; Vittorio M. N. Passaro
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Paper Abstract

The analysis and design of a Fresnel microlens array are developed in order to couple a large incident guided beam into a channel waveguide array for performing optical computing and signal processing operations. The device includes a planar waveguide region constituted by an AlGaAs/AlGaAs/GaAs epitaxial layer structure, with appropriate Al title and thickness, allowing the propagation of both the TE and TM polarizations of the guided beam. The channel waveguide region can be obtained by the diffusion of zinc in the planar waveguide. Each Fresnel lens of the array is assumed to be of the graded thickness type, and it can be fabricated on an additional AlGaAs layer by zinc diffusion. The designed array exhibits good theoretical properties, including very short focal length and very small focal spot size. It also makes it possible to couple only one polarization of the incident planar wave, i.e., TM polarization. A detailed simulation of the electric field distribution in the focal plane of each lens is also performed.

Paper Details

Date Published: 1 February 1991
PDF: 11 pages
Proc. SPIE 1374, Integrated Optics and Optoelectronics II, (1 February 1991); doi: 10.1117/12.24959
Show Author Affiliations
Mario Nicola Armenise, Univ. di Bari (Italy)
Fabrizio Impagnatiello, Univ. di Bari (Italy)
Vittorio M. N. Passaro, Univ. di Bari (Italy)

Published in SPIE Proceedings Vol. 1374:
Integrated Optics and Optoelectronics II
Ka Kha Wong, Editor(s)

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