Characterization and correction of spherical aberration due to glass substrate in the design and fabrication of Fresnel zone lenses
A. VijayakumarCentre for NEMS and Nanophotonics, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, IndiaShanti BhattacharyaCentre for NEMS and Nanophotonics, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
2013en
ABI
Abstract
As with a conventional lens, a Fresnel zone lens (FZL) can be used to image objects at infinity or nearby. In the latter case, the FZL converts a diverging spherical wavefront into a converging spherical wavefront. The glass substrate on which the FZL is fabricated introduces spherical aberration resulting in a shift of the image plane and blurring of the image. Two novel schemes for correction of this spherical aberration are proposed and studied in this paper. To demonstrate them, FZLs are designed with and without aberration correction. They are fabricated using electron beam direct writing. The devices are evaluated and the accuracy of the proposed aberration correction schemes is validated.
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