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devices or arrangements, the optical operation of which ismodified by changing the optical properties of the medium of thedevices or arrangements for the control of the intensity,colour, phase, polarisation or direction of light, e.g.switching, gating, modulating or demodulating (4) 4
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Optics and Lasers in Engineering, ISSN 0143-8166, 06/2016, Volume 81, pp. 79 - 86
Journal Article
Optics and Lasers in Engineering, ISSN 0143-8166, 2009, Volume 47, Issue 5, pp. 539 - 546
We propose a new method for image encryption, using gyrator transform and chaos theory. Random phase masks are generated using chaos functions and are called... 
Kaplan-Yorke map | Image encryption/decryption | Logistic map | Tent map | Gyrator transform | Mean square error | FRACTIONAL FOURIER-TRANSFORMS | SECURITY SYSTEM | DYNAMICS | MULTISTAGE | OPTICS | Computer simulation | Computer-generated environments
Journal Article
Optics and Lasers in Engineering, ISSN 0143-8166, 2008, Volume 46, Issue 2, pp. 117 - 123
Journal Article
International Journal of Electronic Commerce Studies, ISSN 2073-9729, 2014, Volume 5, Issue 2, pp. 233 - 246
Journal Article
Journal of Optics (United Kingdom), ISSN 2040-8978, 11/2016, Volume 18, Issue 11, p. 115701
In this paper, we present a new technique to obtain biometric keys by using the fingerprint of a person for an optical image encryption system. The key... 
optical encryption and decryption | digital holography | fingerprint phase mask key | authentication | SCHEME | FINGERPRINT | TRANSFORM | OPTICS | RANDOM-PHASE ENCRYPTION | IMAGE ENCRYPTION
Journal Article
Optics and Lasers in Engineering, ISSN 0143-8166, 2010, Volume 48, Issue 3, pp. 398 - 404
We propose a new opto-electronic secure communication system using logistic map and pulse position modulation. A modified version of the electronic circuit of... 
Opto-electronic encryption/decryption | Logistic map | Pulse position modulation | GYRATOR TRANSFORM | PLANE | OPTICAL-IMAGE ENCRYPTION | FRACTIONAL FOURIER-TRANSFORM | DYNAMICS | OPTICS | PULSE-POSITION MODULATION
Journal Article
Journal of Optics (United Kingdom), ISSN 2040-8978, 02/2015, Volume 17, Issue 3, pp. 35701 - 8
A real-time optical video encryption technique using a chaotic map has been reported. In the proposed technique, each frame of video is encrypted using two... 
optical encryption | joint transform correlator | video encryption | SYSTEM | SCHEME | MULTIPLE-IMAGE ENCRYPTION | FRACTIONAL FOURIER-TRANSFORM | ARCHITECTURE | OPTICS | POLARIZED-LIGHT | REFERENCE WAVE | Computer simulation | Chaos theory | Unauthorized | Digital | Mathematical models | Encryption | Joint transform correlators | Masks
Journal Article
Journal of Physics D: Applied Physics, ISSN 0022-3727, 08/2017, Volume 50, Issue 38, p. 385107
We report the fabrication and characterization of electrically-tunable periodically segmented waveguides (PSWs) with different duty cycles of 0.25, 0.33, 0.50... 
electrooptic devices | periodically-segmented waveguide | liquid crystal devices | PHYSICS, APPLIED | PROPAGATION CHARACTERISTICS
Journal Article
Optics Communications, ISSN 0030-4018, 2009, Volume 282, Issue 6, pp. 1104 - 1109
We propose a new method for image encryption using Hartley transform with jigsaw transform and logistic map. Logistic map has been used to generate the random... 
Jigsaw transform | Image encryption/decryption | Logistic map | Hartley transform | Mean square error | DOMAIN | FRACTIONAL FOURIER-TRANSFORM | ALGORITHM | LIGHT | CHAOS | SECURITY | DYNAMICS | MULTISTAGE | OPTICS | Computer simulation | Computer-generated environments
Journal Article
Journal of Molecular Liquids, ISSN 0167-7322, 01/2019, Volume 274, pp. 592 - 597
Nano-doping of bent-core liquid crystals are of recent interest because the blending of bent-core liquid crystals with nanoparticles opens a new avenue both... 
Bent-core liquid crystals | Cybotactic cluster | Nano-doping | Diffusion constant | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL | CHEMISTRY, PHYSICAL | IONS | ANISOTROPY | NEMATIC PHASE | IMPACT | MODES | TEMPERATURE | CONDUCTIVITY | LOW-FREQUENCY RELAXATION | ENHANCEMENT
Journal Article
Journal of Physics Condensed Matter, ISSN 0953-8984, 02/2018, Volume 30, Issue 9, p. 095101
We report the effect of dispersion of barium titanate (BaTiO3) nanoparticles (BNPs) in a four ring bent core nematic (BCN) liquid crystal. Polarizing optical... 
spontaneous polarization | barium titanate nanoparticles | Bent core nematic | cybotactic cluster | conductivity | NANOPARTICLES | ORDER | PHYSICS, CONDENSED MATTER | PHASE | LIQUID-CRYSTALS
Journal Article
Optical Materials, ISSN 0925-3467, 11/2015, Volume 49, pp. 292 - 296
•We have studied switching characteristics of the LC core waveguides, realized using nanocolloids of the nematic LC 5CB.•The electro-optic characteristics of... 
Dielectric anisotropy | Liquid crystal devices | Electro-optical waveguide devices | Titanium dioxide nanoparticles | Optical switching devices | SYSTEM | ELECTROOPTICAL CHARACTERISTICS | MATERIALS SCIENCE, MULTIDISCIPLINARY | INSULATING-NANOPARTICLES | DEVICE | OPTICS
Journal Article
Optics and Lasers in Engineering, ISSN 0143-8166, 08/2013, Volume 51, Issue 8, pp. 1014 - 1022
In this paper, an optical security system has been proposed in which key of the double random phase encoding technique is linked to the biometrics of the user... 
RSA | BCH code | Key management scheme | Biometric security system | IMAGE | FINGERPRINT | OPERATION | FRACTIONAL FOURIER-TRANSFORM | OPTICS | Security systems | Biometry | Retrieval | Biometrics | Lasers | Mathematical analysis | Encoding | Vectors (mathematics) | BCH codes | Recognition
Journal Article
Optics and Lasers in Engineering, ISSN 0143-8166, 05/2019, Volume 116, pp. 32 - 40
•A new optical asymmetric encryption scheme using biometric keys is proposed.•This scheme addresses the issue of keys distribution with enhanced security.•The... 
Fingerprint biometric key | Digital holography | Optical encryption and decryption | Authentication | Asymmetric cryptosystem | SYSTEM | MIXTURE RETRIEVAL TYPE | ALGORITHM | SECURITY ENHANCEMENT | PLAINTEXT ATTACK | FINGERPRINT | OPTICS | RANDOM-PHASE ENCRYPTION | IMAGE ENCRYPTION | Biometry | Algorithms | Numerical analysis
Journal Article
Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X, 2011, Volume 8173
Conference Proceeding
Optics and Lasers in Engineering, ISSN 0143-8166, 2010, Volume 48, Issue 3, pp. 329 - 334
Public-key encryption has been used to encode the key of the encryption process. In the proposed technique, an input image has been encrypted by using the... 
Public-key encryption | Encryption and Decryption | Double random-phase-encoding | Optical-image Encryption | Extended fractional Fourier transform | SYSTEM | OPTICAL ENCRYPTION | PLANE | FRACTIONAL FOURIER-TRANSFORM | OPTICS | IMAGE ENCRYPTION
Journal Article
Journal of Molecular Liquids, ISSN 0167-7322, 05/2018, Volume 257, pp. 144 - 154
Nematic phase of bent-core liquid crystals (LCs) exhibiting cybotactic clusters (NCyb) have gained significant importance owing to its promising ability to... 
Bent-core | Ferronematic | Cybotactic | Liquid crystals | TRANSITION | HOMOLOGOUS SERIES | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL | CHEMISTRY, PHYSICAL | SMECTIC-A PHASE
Journal Article
Optics Communications, ISSN 0030-4018, 2010, Volume 283, Issue 1, pp. 34 - 43
We propose an optics based biometric encryption technique using log polar transform. In this method, the key of the encryption process has been linked to the... 
ROTATION | SCALE | OPTICS | FRACTIONAL FOURIER-TRANSFORM | IMAGE ENCRYPTION | Biometrics | Retrieval | Algorithms | Fingerprints | Images | Transforms | Encryption | Matlab
Journal Article
Optics Communications, ISSN 0030-4018, 2003, Volume 218, Issue 4, pp. 229 - 234
We propose a new technique to encrypt an image for secure image transmission. The digital signature of the original image is added to the encoded version of... 
Digital signature | Image encryption | BCH code | Decryption | Error control code | OPTICAL ENCRYPTION | INFORMATION | SIGNIFICANT OUTPUT IMAGES | image encryption | FRACTIONAL FOURIER-DOMAIN | JOINT TRANSFORM CORRELATOR | digital signature | SECURITY | SYSTEMS | error control code | OPTICS | decryption
Journal Article
Journal of Modern Optics, ISSN 0950-0340, 07/2017, Volume 64, Issue 13, pp. 1321 - 1329
A nonlinear image encryption scheme using phase-truncated Fourier transform (PTFT) and natural logarithms is proposed in this paper. With the help of the PTFT,... 
information security | Image encryption | phase retrieval | face biometric based phase mask key | PHASE-RETRIEVAL ALGORITHM | ASYMMETRIC CRYPTOSYSTEM | FRESNEL DOMAIN | KEYS | OPTICS | TRUNCATED FOURIER-TRANSFORMS | PLAINTEXT ATTACK | Biometrics | Principal components analysis | Fourier transforms | Public Key Infrastructure | Data encryption
Journal Article
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