Optics Research Laboratory

Indian Institute of Technology Bhilai, Durg, Chhattisgarh, India

1. Tripathi K, Sinha G, Dixit A, Kumar P. Generation of cylindrical-vector beams using a dual, slow-axis liquid crystal Spatial Light Modulator, IEEE Photon. Technol. Lett. 2025.

2. Tripathi K, Kumar R, Kumar P. Polarization-referenced phase modulation for encoding and detection of structured singular beams, Appl. Phys. B 2025.

3. Tripathi K, Laxminarayan, Kumar P, Rajput S, Awatsuji Y, “Multi-spectral vortex beam generation using phase-calibrated liquid crystal spatial light modulator,” Optica Open, 2025.

4. Deshmukh T, Laxminarayan, Nishchal NK, Kumar P, Singh K, “Color image authentication using QR code through spatially varying polarization in vectorial light fields,” Optica Open, 2025.

5. Laxminarayan, Tripathi KK, Kumar P, Rao AS, and Omatsu T, "Single-phase modulated optical skyrmions for information security applications," Opt. Express 33, 51116-51141 (2025).https://doi.org/10.1364/OE.573686

6. Bang SP, Kumar P, and Yoon G, "Quantifying ocular microaberration using a high-resolution Shack-Hartmann wavefront sensor," Biomed. Opt. Express, 16, 3128-3138, 2025. https://doi.org/10.1364/BOE.566011

7. Shiv Ganesh, Laxminarayan, Nishchal NK, Kumar P, “Polarization-engineered vortex encoding for two-dimensional Exclusive-OR operation,” Opt. Laser Tech.,192, 2025, 113809, https://doi.org/10.1016/j.optlastec.2025.113809

8. Laxminarayan, Nishchal NK, Omatsu T, Rao, Kumar P, “Singularity transformation through single-pass phase modulation of light” Sci Rep. 2025,  https://doi.org/10.1038/s41598-025-90451-z

9. Laxminarayan, Kumar P, “Charge identification of composite vortex beams through self-referenced interferometry” Opt. Commun. 2025, https://doi.org/10.1016/j.optcom.2025.131625

10.  Manchaiah D, Kumar R, Chauhan VS, Kumar P, Nishchal NK, Easwaran RK, “Impact of higher-order Laguerre-gaussian modes on electromagnetically induced transparency resonances in Rb atomic vapor medium” J. Opt. 2024, 1-10, J25, https://doi.org/10.1007/s12596-024-02068-6

11.  Kumar R, Kumar P, Nishchal NK, AlFalou A “Image authentication with exclusive-OR operated optical vortices” J. Opt. Soc. Am. A 2024, https://doi.org/10.1364/JOSAA.527399

12.  Tamura R, Kumar P, Rao AS, Tsuda K, Getzlaff F, Miyamoto K, Litchinitser NM, Omatsu T, “Direct imprint of optical skyrmions in azopolymers as photo-induced relief structures” APL Photonics 2024, https://doi.org/10.1063/5.0192239

13.  Shikder A, Rao SK, Kumar P, Nishchal NK, “Binary image encryption with a QR code-encoded optical beam having an array of vortices” J. Opt. Soc. Am. A 2024, 41 (3), A73-A82. https://doi.org/10.1364/JOSAA.507046

14.  Baliyan M, Kumar P, Nishchal NK, “Image encryption through dual-pass modulated azimuthally polarized vector field” IEEE Photon. Technol. Lett., 2024, 36(5), 313 – 316,. https://doi.org/10.1109/LPT.2023.3348935

15.  Kumar P, Rao AS, Omatsu T, “Generation of V-point polarization singularity using single phase encoding with a spatial light modulator” Sci Rep. 2023, 13 (1), 1-7, https://doi.org/10.1038/s41598-022-27337-x

16.  Shikder A, Kumar P, Nishchal NK, Image encryption by structured phase encoding and its effectiveness in turbulent medium, IEEE Photon. Technol. Lett. 2022, 35, 128-131. https://doi.org/10.1109/LPT.2022.3226200

17.  Kumar P, Nishchal NK, Omatsu T, Rao AS, “Self-referenced interferometry for single-shot detection of vector-vortex beams,” Sci Rep. 2022, 12, 1-11,  https://doi.org/10.1038/s41598-022-21485-w

18.  Kumar P, Nishchal NK, AlFalou A, "Color image encryption using vectorial light field through a compact optical set-up" J. Opt. 2022, 24, 064017,  https://doi.org/10.1088/2040-8986/ac6f0d

19.  Kumar P, Nishchal NK, Omatsu T, Rao A S, "Optical vortex array for two-dimensional exclusive-OR operation" Appl. Phys. B 2022, 128, 98,  https://doi.org/10.1007/s00340-022-07818-7

20.  Kumar P, Nishchal NK, AlFalou A, "Controllable Optical Vortex Array for Image Encoding" IEEE Photon. Technol. Lett. 2022, 34, 521-524. https://doi.org/10.1109/LPT.2022.3169011

21.  Kumar P, Nishchal NK, "Formation of singular light fields using phase calibrated spatial light modulator" Opt. Lasers Eng. 2021, 146, 106720. https://doi.org/10.1016/j.optlaseng.2021.106720

22.  Kumar P, Nishchal NK, "Array formation of optical vortices using in-line phase modulation" Opt. Commun. 2021, 493, 127020, https://doi.org/10.1016/j.optcom.2021.127020

23.  Gupta AK, Kumar P, Nishchal NK, Alfalou A, "Polarization-encoded Fully-Phase Encryption using Transport of Intensity Equation" Electronics 2021, 10, 969, .https://doi.org/10.3390/electronics10080969

24.  Kumar P, Fatima A, Nishchal NK, "Arbitrary vector beam encoding using single modulation for information security applications" IEEE Photon. Technol. Lett. 2021 33, 243–246,. https://doi.org/10.1109/LPT.2021.3052571

25.  Kumar P, Nishchal NK, "Phase response optimization of a liquid crystal spatial light modulator with partially coherent light" Appl. Opt. 2021, 60, 10795-10801. https://doi.org/10.1364/AO.439654

26.  Chauhan VS, Dixith M, Kumar P, Kumar R, Bhushan S, Easwaran RK, "Measurement of dispersive properties of multi window electromagnetically induced transparency in Rubidium atomic vapor medium by using spatial light modulator" Optik 2021, 255, 165707, https://doi.org/10.1016/j.ijleo.2020.165707

27.  Kumar P, Pal SK, Nishchal NK, Senthilkumaran P, "Formation of Polarization Singularity Lattice through Dual-phase Modulation" J. Opt. 2020 22 115701,. .https://doi.org/10.1088/2040-8986/abbb5d

28.  Kumar P, Pal SK, Nishchal NK, Senthilkumaran P, “Non-interferometric technique to realize vector beams embedded with polarization singularities” J. Opt. Soc. Am. A 2020, 37, 1043–1052, . https://doi.org/10.1364/JOSAA.393027

29.  Chauhan VS, Kumar R, Dixith M, Kumar P, Easwaran RK, "Narrowing of electromagnetically induced transparency by using structured coupling light in 85Rb atomic vapour medium," Laser Phys. 2020, 30, 065203,.  https://doi.org/10.1088/1555-6611/ab8568

30.  Kumar P, Nishchal NK, "Self-referenced interference of laterally displaced vortex beams for topological charge determination" Opt. Commun. 2020, 459, 125000,. https://doi.org/10.1016/j.optcom.2019.125000

31.  Kumar P, Nishchal NK, "Self-referenced spiral interferogram using modified lateral shearing Mach–Zehnder interferometer," Appl. Opt. 2019, 58, 6827–6833,. https://doi.org/10.1364/AO.58.006827

32.  Kumar P, Nishchal NK, "Modified Mach–Zehnder interferometer for determining the high-order topological charge of Laguerre–Gaussian vortex beams" J. Opt. Soc. Am. A 2019, 36, 1447–1455,.  https://doi.org/10.1364/JOSAA.36.001447

33.  Kumar P, Fatima A, Nishchal NK, "Image encryption using phase-encoded exclusive-OR operations with incoherent illumination" J. Opt. 2019, 21, 065701, . https://doi.org/10.1088/2040-8986/ab173b

34.  Kumar P, Nishchal NK, "Enhanced exclusive-OR and quick response code-based image encryption through incoherent illumination" Appl. Opt. 2019, 58, 1408–1412, . https://doi.org/10.1364/AO.58.001408

1.     Shikder A, Kumar P, Nishchal NK, Singh K, “Types of structured light beams and their applications in optical cryptography: A review”, Asian J. Phys. 2023, 32 (5-8), 369-383. https://asianjournalofphysics.com/types-of-structured-light-beams-and-their-applications-in-optical-cryptography-a-review/

2.     Kumar P, Nishchal NK, “Realizing singular beams through dual-pass phase modulation” Asian J. Phys. 2021, 30(8-9), 1355-1364.

https://asianjournalofphysics.com/realizing-singular-beams-through-dual-pass-phase-modulation/Asian J. Phys.

3.     Kumar P, Nishchal NK, Singh K, "Role of self-referenced interferometry in measuring the orbital angular momentum of optical vortices: A review" Asian J. Phys. 2020, 29, 835-852. https://asianjournalofphysics.com/wp-content/uploads/2021/10/roleofself-referencedinterferometryinmeasuringtheorbitalangularmomentumofopticalvorticesareview.pdf

1. Bang S, Kumar P, Schill AW, Yoon G, Quantifying Wavefront Errors Induced by Intraocular Scatter Using Ultrahigh-Resolution Shack-Hartmann Wavefront Sensor, Investigative Ophthalmology & Visual Science 65 (7), 3376-3376, May 2024. https://iovs.arvojournals.org/article.aspx?articleid=2798085

2. Tamura R, Kumar P, Rao AS, Tsuda K, Getzlaff F, Miyamoto K, Omatsu T, “Creation of exotic structures in azopolymers with optical skyrmions” Complex Light and Optical Forces XVIII, PC1290105, 2024. https://doi.org/10.1117/12.2690980

3. Tamura R, Kumar P, Rao AS, Miyamoto K, Omatsu T, “Generation of optical skyrmion by using a spatial light modulator with a self-interferometer configuration,” Optical Manipulation and Structured Materials Conference 12606, 151-152, Sept. 2023 https://doi.org/10.1117/12.3008369

4. Rao AS, Kumar P, Omatsu T, “Cylindrical Vector Vortex Beams Generation with a Single Phase Encoded Spatial Light Modulator,” 2023 IEEE Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), June 2023, https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10231550

5. Kumar P, Bang S, Yoon G, Ocular Optics Characterization using Transport of Intensity Equation, Investigative Ophthalmology & Visual Science 64 (8), 5330-5330, June 2023, https://iovs.arvojournals.org/article.aspx?articleid=2789277

6. Kumar P, Nishchal NK, Omatsu T, Rao AS, “A compact optical set-up to create high-order vectorial structured light beams,” Conference on Lasers and Electro-Optics/Pacific Rim, CTuP5A_05, Sept 2022, https://doi.org/10.1364/CLEOPR.2022.CTuP5A_05

7. Kumar P, Nishchal NK, Omatsu T, Rao AS, Optimization of spatial light modulator’s phase response through computer-generated hologram, Adaptive Optics and Applications, July 2022 https://doi.org/10.1364/AOA.2022.OTh5B.3

8.     Kumar P, Nishchal NK, "Vector field encoding approach to secure color image," OSA Imaging and Applied Optics Congress, July 2021. https://doi.org/10.1364/DH.2021.DW6C.4

9.     Kumar P, Nishchal NK, "Generation of singular beams using electrically addressed liquid crystal spatial light modulator," 5th International Conference on Emerging Electronics (ICEE), Nov. 2020, IIT Delhi.https://doi.org/10.1109/ICEE50728.2020.9776736

10.  Kumar P, Nishchal NK, "Cylindrical vector beams by tailoring single polarization component," OSA Topical Meeting on Digital Holography and 3D Imaging, June 2020, Vancouver, Canada. https://doi.org/10.1364/3D.2020.JTh2A.22

11.  Gupta AK, Kumar P, Nishchal NK, "Fully-phase encryption using transport of intensity equation," OSA Topical Meeting on Digital Holography and 3D Imaging, June 2020, Vancouver, Canada. https://doi.org/10.1364/DH.2020.HF2D.4

12.  Kumar P, Nishchal NK, "Self-referenced interferometric methods to determine topological charge of vortex beams," OSA Topical Meeting on Digital Holography and 3D Imaging, June 2020, Vancouver, Canada. https://doi.org/10.1364/3D.2020.JTh2A.23

13.  Kumar P, Nishchal NK, "Determining orbital angular momentum of light by analyzing interferogram with conjoined fork-like structures," Workshop on Recent Advances in Photonics (WRAP), Dec. 2019, IIT Guwahati. https://doi.org/10.1109/WRAP47485.2019.9013879

1. Kumar P, “Working on Optics”, Research Scholar’s Day (RSD), Mar. 2024, IIT Patna.

2. Kumar P, “Light shaping and sensing”, International Conference on Recent Trends in Science and Engineering (ICRTSE), February 2024, IIT Bhilai & Govt VYT PG Autonomous College Durg.

3. Kumar P, “Structured light beams for information science applications”, International conference on multidisciplinary approach and current challenges for sustainability, (MACCS) (Online), April 2024, G H Raisoni University, Amravati.

4. Kumar P, “Shaping and sensing of Light fields”, IEEE Sensors Council Student Branch Chapter MNNIT Allahabad Webinar Session (Online), July 21, 2024, MNNIT Allahabad.

5. L Sahu, P Kumar, 1st International Conference on Emerging Trends in Optical Technologies (ETOT-I), held from Jan 2-4, 2025, at SRM University-Andra Pradesh, India.

2.     Kumar P, “Career opportunities in Optics”, 17 Mar 2025, Y.S. Mahavidyalaya, Ranchi.

3.     Kumar P, “Opportunities in Optics”, 28 Feb 2025, Kalyan PG College, Durg.

4.     Jaiswal A, Kumar A, Kumar P, "Impact of Laser Speckles on Optical Cryptography", International Conference on Advances in Novel Materials: Towards Sustainable Future (ICAN-2024), Jan. 20-22, 2024, St. Xavier's College, Ranchi.

5.     Kumar P, “Light shaping and sensing”, International Conference on Recent Trends in Science and Engineering (ICRTSE), February 8-10, 2024, IIT Bhilai & Govt VYT PG Autonomous College Durg.

6.     L Sahu, P Kumar, “Multi-singular laser beam”, National Science Day (NSD), 28 Feb 2024, IIT Bhilai

7.     Jaiswal A, Kumar A, Kumar P, "Impact of Laser Speckles on Optical Cryptography", International Conference on Advances in Novel Materials: Towards Sustainable Future (ICAN-2024), Jan. 20-22, 2024, St. Xavier's College, Ranchi.

8.     Kumar P, Nishchal NK, "Investigations on structured light to probe optical singularity and its use in image encryption, "Research & Industrial Conclave-Integration (Online), January 20 - 23, 2022, IIT Guwahati.

9.     Kumar P, and Nishchal NK, “Structured laser beams”, Siegman International Summer School on lasers, University of Warsaw and OPTICA foundation, Poland, July 2021 (online).

10.  Kumar P, and Nishchal NK, "Information encoding and encryption using vector light fields," Research Scholar’s Day (RSD), Mar. 20, 2021, IIT Patna.

11.  Kumar P, Nishchal NK, "Creation and detection of singular light beams," Student Conference on Photonics and Quantum Technology (Online), Feb. 24-26, 2021, NISER Bhubaneswar.

12.  Kumar P, Nishchal NK, "Securing multiple images using beams with spatially variant polarization," Optics & Photonics: Theory & Computational Techniques (Online), Dec. 26-27, 2020, IIT Roorkee.

13.  Kumar P, and Nishchal NK, "Generation of vector beam using spatial light modulator," Research Scholar’s Day (RSD), Mar. 7, 2020, IIT Patna.

14.  Kumar P, Nishchal NK, "Topological charge estimation of vortex beams through conjoined fork-like fringe pattern," Int' l. OSA Network of Students Conference (IONS), Feb. 29 - Mar. 2, 2020, IIT Delhi.

15.  Kumar P, and Nishchal NK, "Topological charge determination of high-order Laguerre-Gaussian beams using Mach-Zehnder interferometer," National Symposium on Light-Matter Interactions (NSLMI), Dec. 26, 2019, IIT Madras.

16.  Kumar P, Nishchal NK, "Self-referenced interferogram of Laguerre-Gaussian beams for topological charge determination," 20th Int'l. Symp. on Optomechatronic Technologies (ISOT), Nov. 11-13, 2019, Goa.

17.  Kumar P, Nishchal NK, "Self-referenced interferometric technique for determining high-order topological charges of vortex beams," Int'l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL), Oct. 19-22, 2019, IRDE Dehradun.

18.  Kumar P, Kumar A, Nishchal NK, "LED-based implementation of exclusive-OR operation for securing QR code," Int'l. Confer. on Optics and Electro-optics (XLIII Symp. of Optical Society of India) (ICOL), Oct. 19-22, 2019, IRDE Dehradun.

19.  Kumar P, and Nishchal NK, "Optical cryptosystems with quick response code," Information Photonics (IP), April 24-26, 2019, Yokohama, Japan.

20.  Kumar P, and Nishchal NK, "Measurement of orbital angular momentum of light using Mach-Zehnder interferometer," Research Scholar’s Day (RSD), Mar. 9, 2019, IIT Patna.

21.  Kumar P, Fatima A, Nishchal NK, "Multiple image security scheme based on Stokes parameter of spatially varying polarized beam," The Int'l. Confer. on Fiber Optics and Photonics (PHOTONICS), Dec 12-15, 2018, IIT Delhi.

22.  Kumar P, Nishchal NK, "Generation of orbital angular momentum of light using liquid crystal spatial light modulator," XLII Annual Meeting of the Optical Society of India-Int'l. Symp. on Optics (OSI-ISO), Sept. 19-22, 2018, IIT Kanpur.