Fractal Zone plates and optical pin sieves are designed and their focusing properties are analyzed using scalar diffraction formula. It is found that these zone plates offer better control on beam parameters compared to Fresnel Zone plates. These zone plates are then fabricated on to quartz substrates using UV lithography and the results are confirmed. © 2011 SPIE.

Shanti Bhattacharya

Department of Electrical Engineering

Anand Vijayakumar

BEAM PARAMETER

FOCUSING PROPERTIES

FRACTAL ZONE PLATE

FRACTAL ZONE PLATES

FRESNEL ZONE PLATE

PHOTON SIEVE

Quartz substrate

SCALAR DIFFRACTION

UV LITHOGRAPHY

ZONE PLATES

Fractals

optics

Photonics

Quartz

Sieves

Plates (structural components)

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Analysis of versatile phase zone plates

Proceedings of SPIE - The International Society for Optical Engineering

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. © 2013 Optical Society of America.

Applied Optics

Characterization and correction of spherical aberration due to glass substrate in the design and fabrication of Fresnel zone lens

Journal	Proceedings of SPIE - The International Society for Optical Engineering
ISSN	0277786X
Open Access	No