J
Joby Joseph
Researcher at Indian Institute of Technology Delhi
Publications - 206
Citations - 4417
Joby Joseph is an academic researcher from Indian Institute of Technology Delhi. The author has contributed to research in topics: Holography & Fourier transform. The author has an hindex of 28, co-authored 196 publications receiving 3842 citations. Previous affiliations of Joby Joseph include University of Massachusetts Boston & Indian Institutes of Technology.
Papers
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Optical encryption by double-random phase encoding in the fractional Fourier domain.
TL;DR: An optical architecture that encodes a primary image to stationary white noise by using two statistically independent random phase codes that has an enhanced security value compared with earlier methods is proposed.
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Optical encryption system that uses phase conjugation in a photorefractive crystal.
TL;DR: In this work, an optical encryption system based on double-random phase encoding of the data at the input and the Fourier planes is implemented, and the key that is used during encryption can be used for decrypting the data, thereby alleviating the need for using a conjugate of the key.
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Optical image encryption using a jigsaw transform for silhouette removal in interference-based methods and decryption with a single spatial light modulator
TL;DR: This work proposes a noniterative method using the jigsaw transformation (JT) in a single step, with improved security because the inverse JT of these masks, along with correct permutation keys that are necessary to decrypt the original image are provided.
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Securing information using fractional Fourier transform in digital holography
TL;DR: In this paper, the input image to be encrypted is multiplied by a phase mask, and either its Fourier or fractional Fourier transform is obtained using interference with a wave from another random phase mask.
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Hybridized Guided-Mode Resonances via Colloidal Plasmonic Self-Assembled Grating.
Swagato Sarkar,Swagato Sarkar,Vaibhav Gupta,Mohit Kumar,Mohit Kumar,Jonas Schubert,Patrick T. Probst,Joby Joseph,Tobias A. F. König,Tobias A. F. König +9 more
TL;DR: This work uses gold nanoparticles self-assembled in a linear template on a titanium dioxide layer to study the dispersion relation with conventional ultraviolet–visible–near-infrared spectroscopic methods and identifies the optical band gaps as hybridized modes: plasmonic and photonic resonances.