Contrast reversal and enhancement of phase spot array/grid with an intensity-dependent refractive index medium as phase filter |
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Authors: | Kaladevi Sendhil C. Vijayan M.P. Kothiyal |
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Affiliation: | Department of Physics, Indian Institute of Technology, Madras, Chennai – 600036, India |
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Abstract: | We report on a complete contrast reversal and contrast enhancement of a holographically recorded phase spot array/grid achieved by phase filtering, using an intensity-dependent refractive index medium, zinc tetraphenyl porphyrin as phase filter placed in the Fourier plane of the 4-f imaging system. We show that the contrast enhancement is robust and insensitive to local errors in the phase array and can be used to repair a damaged portion of the input phase array. |
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Keywords: | Image enhancement Holographic array illuminator Phase filtering Porphyrin |
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