Embedded Files
Patents
DUAL SLOW-AXIS LIQUID-CRYSTAL-ON-SILICON SPATIAL LIGHT MODULATOR. Submitted on April 2026, Application Number: 202621050687.
Journals
Color image authentication with QR code through structured light field
Tileshwar, Laxminarayan, Naveen K Nishchal, P Kumar, K Singh
Optimized simultaneous generation of dual-wavelength phase and polarization singularities
KK Tripathi, Laxminarayan, SK Rajput, Y Awatsuji, P Kumar
Image authentication with topologically stable C-point singularities
Tileshwar, P Kumar
Applied Optics 65 (14), 4708-472026, 2016
Roadmap on singular optics and its applications
GM Balasubramaniam, SR Allam, V Anand, MH Ansari, FG Arockiaraj, et al.
Applied Physics B, 132 (5), 58, 2026
Polarization-referenced phase modulation for encoding and detection of structured singular beams
Tripathi K, Kumar R, Kumar P.,
Generation of cylindrical-vector beams using a dual-slow-axis liquid crystal Spatial Light Modulator
Tripathi K, Sinha G, Dixit A, Kumar P
IEEE Photonics Technology Letters, 2026
Single-phase modulated optical skyrmions for information security applications
Laxminarayan, Tripathi KK, Kumar P, Rao AS, and Omatsu T
Optics Express 33, 51116-51141, 2025
Polarization-engineered vortex encoding for two-dimensional Exclusive-OR operation
Shiv Ganesh, Laxminarayan, Nishchal NK, Kumar P
Optics & Laser Technology, 192, 2025, 113809
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Quantifying ocular microaberration using a high-resolution Shack-Hartmann wavefront sensor
Bang SP, Kumar P, and Yoon G
Biomedical Optics Express, 16, 3128-3138, 2025
Singularity transformation through single-pass phase modulation of light
Laxminarayan, Omatsu T, Rao, Kumar P
Charge identification of composite vortex beams through self-referenced interferometry
Laxminarayan, Kumar P
Impact of higher-order Laguerre-gaussian modes on electromagnetically induced transparency resonances in Rb atomic vapor medium
Manchaiah D, Kumar R, Chauhan VS, Kumar P, Nishchal NK, Easwaran RK
Journal of Optics, 1-10, J25, 2024
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Image authentication with exclusive-OR operated optical vortices
Kumar R, Kumar P, Nishchal NK, AlFalou A
Journal of Optical Society of America A, 2024
Direct imprint of optical skyrmions in azopolymers as photo-induced relief structures
Tamura R, Kumar P, Rao AS, Tsuda K, Getzlaff F, Miyamoto K, Litchinitser NM, Omatsu T
Binary image encryption with a QR code-encoded optical beam having an array of vortices
Shikder A, Rao SK, Kumar P, Nishchal NK
Journal of the Optical Society of America A2024, 41 (3), A73-A82
Image encryption through dual-pass modulated azimuthally polarized vector field
Baliyan M, Kumar P, Nishchal NK
IEEE Photonics Technology Letters, 36(5), 313 – 316, 2024
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Generation of V-point polarization singularity using single phase encoding with a spatial light modulator.
Kumar P, Rao AS, Omatsu T
Scientific Report. 2023, 13 (1), 1-7, 2023
Image encryption by structured phase encoding and its effectiveness in turbulent medium.
Shikder A, Kumar P, Nishchal NK
IEEE Photon. Technol. Lett, 35, 128-131,2022
Self-referenced interferometry for single-shot detection of vector-vortex beams.
Kumar P, Nishchal NK, Omatsu T, Rao AS
Scientific Report. 12, 1-11,2022
Color image encryption using vectorial light field through a compact optical set-up.
Kumar P, Nishchal NK, AlFalou A
Journal of Optics. 24, 064017,2022
Optical vortex array for two-dimensional exclusive-OR operation.
Kumar P, Nishchal NK, Omatsu T, Rao A S
Applied Physics B 128, 98,2022
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Controllable Optical Vortex Array for Image Encoding.
Kumar P, Nishchal NK, AlFalou A
IEEE Photon. Technol. Lett. 2022, 34, 521-524
Formation of singular light fields using phase calibrated spatial light modulator.
Kumar P, Nishchal NK
Optics and Lasers in Engineering. 146, 106720, 2021
Array formation of optical vortices using in-line phase modulation.
Kumar P, Nishchal NK
Optics Communications, 493, 127020, 2021
Polarization-encoded Fully-Phase Encryption using Transport of Intensity Equation.
Gupta AK, Kumar P, Nishchal NK, Alfalou A
Arbitrary vector beam encoding using single modulation for information security applications.
Kumar P, Fatima A, Nishchal NK
IEEE Photon. Technol. Lett. 2021 33, 243–246,2021
Phase response optimization of a liquid crystal spatial light modulator with partially coherent light.
Kumar P, Nishchal NK
Applied Optics. 60, 10795-10801,2021
Measurement of dispersive properties of multi window electromagnetically induced transparency in Rubidium atomic vapor medium by using spatial light modulator.
Chauhan VS, Dixith M, Kumar P, Kumar R, Bhushan S, Easwaran RK
Formation of Polarization Singularity Lattice through Dual-phase Modulation.
Kumar P, Pal SK, Nishchal NK, Senthilkumaran P,J.
Journal of Optics. 22 115701,2020
Non-interferometric technique to realize vector beams embedded with polarization singularities
Kumar P, Pal SK, Nishchal NK, Senthilkumaran P
Journal of the Optical Society of America A 37, 1043–1052,2020
Narrowing of electromagnetically induced transparency by using structured coupling light in 85Rb atomic vapour medium.
Chauhan VS, Kumar R, Dixith M, Kumar P, Easwaran RK
Laser Physics. 30, 065203,2020
Self-referenced interference of laterally displaced vortex beams for topological charge determination.
Kumar P, Nishchal NK
Optics Communications. 459, 125000,2020
Self-referenced spiral interferogram using modified lateral shearing Mach–Zehnder interferometer.
Kumar P, Nishchal NK
Applied Optics. 58, 6827–6833,2019
Modified Mach–Zehnder interferometer for determining the high-order topological charge of Laguerre–Gaussian vortex beams.
Kumar P, Nishchal NK,
Journal of the Optical Society of America A 36, 1447–1455,2019
Image encryption using phase-encoded exclusive-OR operations with incoherent illumination.
Kumar P, Fatima A, Nishchal NK
Journal of Optics. 21, 065701,2019
Enhanced exclusive-OR and quick response code-based image encryption through incoherent illumination.
Kumar P, Nishchal NK
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