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Proceedings Paper

Multimple-imaging and multiple-focusing Fresnel lenses with high numerical aperture
Author(s): David Wood; Paul McKee; Mark P. Dames
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Paper Abstract

We report the successful design and fabrication of integrated devices that combine optical beam splitting and lensing into a single element. These elements are made by etching a 4-phase level pattern into quartz glass using electron beam lithography and reactive ion etching. They are designed using an algorithm based on simulated annealing to optimize the Fresnel-Kirchhoff integral that transforms the lens pixel pattern, containing up to 4 million pixels, to fit the desired output pattern. The devices can be optimized for any conjugate ratio; we have made examples of both imaging and focusing elements. At a working wavelength of 1.52 micrometers , measured efficiencies have been obtained of 67% for 4-phase level, F/2 single lenses and around 62% for 4-level F/2 and F/5 multiple imaging lenses that produce 16 output spots from a single input. In all cases for both the single and multiple lenses the output spots were diffraction limited.

Paper Details

Date Published: 2 March 1993
PDF: 10 pages
Proc. SPIE 1732, Holographics International '92, (2 March 1993); doi: 10.1117/12.141452
Show Author Affiliations
David Wood, BT Labs. (United Kingdom)
Paul McKee, BT Labs. (United Kingdom)
Mark P. Dames, BT Labs. (United Kingdom)

Published in SPIE Proceedings Vol. 1732:
Holographics International '92

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