Title: Nanoporous silicon GRIN lenses

Authors: Suhrawardi Ilyas, Michael Gal

Addresses: School of Physics, The University of New South Wales, Kensington, Sydney 2052, Australia. ' School of Physics, The University of New South Wales, Kensington, Sydney 2052, Australia

Abstract: We describe a novel application of nanoporous silicon as thin GRIN lenses. Positive and negative lenses can be made by achieving a continuous radial variation of the porosity during the fabrication of the layer. The gradient of refractive index in radial direction depends on resistivity of the silicon wafer and etching current density. The shape of the anode determines the type of lens. An electrode in the shape of a ring produces the positive lenses, while a point electrode produces the negative lens.

Keywords: nanoporous silicon; PSi GRIN lenses; Loyeenga model; electrochemical etching; nanotechnology; Australia; silicon wafers; etching current density; anode shape; negative lens; positive lens.

DOI: 10.1504/IJNT.2008.016913

International Journal of Nanotechnology, 2008 Vol.5 No.2/3, pp.163 - 169

Published online: 30 Jan 2008 *

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