Optical transfer function of an imaging system aperture masked by a retarder |
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Authors: | Mohammad Tahir Kallol Bhattacharya Ajay Ghosh A K Chakraborty |
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Institution: | (1) Jhikra High School (H.S), Jhikra, Joypur, Howrah, 711 401, India;(2) Department of Applied Optics and Photonics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Calcutta, 700 009, India |
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Abstract: | Modifications of the imaging characteristics of an imaging system and a consequent increase in relative resolution in the
spatial frequency range of interest have assumed significance in view of the growing applications of microscope imagery. The
present study shows that a diffraction limited imaging system zonally masked by an oblique retarder is much more versatile
in the sense that the imaging characteristics can be controlled in real time by virtue of the higher degrees of freedom available
to the user. It has been shown that the optical transfer function (OTF) of the system varies periodically with the orientation
ϑ of the analyzer at the output. Interestingly, it follows that the optical characteristics of the proposed imaging system
can be expressed in terms of three OTF components which combined together gives rise to the overall system OTF. By proper
choice of the polarization parameters involved it also possible to isolate these components or to select a convenient combination
of these components. Finally, simulated results show that subtraction of two images produced by the proposed retarder masked
lens yields OTFs that are difficult to obtain otherwise. |
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Keywords: | |
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