Academic 

• Awarded Ph. D. from  Birla Institute of Technology, Mesra, Ranchi in 2009
• M.Sc. (Physics) from Ranchi University, Ranchi in 2003
• B.Sc. (Physics Honours) from St. Xavier’s College, Ranchi in 2000  

Professional 

• Presently, working as an In-charge of the Department of Physics, since 13^th January 2016.

Short Term Course Attended

• Successfully completed UGC Sponsored Orientation Programme at Ranchi University, Ranchi from 15/05/2015 to 11/06/2015.

Nonlinear Optics

Senior Research Fellowship, conferred by CSIR, Govt. of India

JOURNAL PUBLICATIONS  (SCI: 25 and ESCI / SCOPUS INDEXED: 06)

1. All-Optical Passive Transistor, S. Medhekar and Ram Krishna Sarkar, Optics Letters, 30, 887 (2005).

RESEARCH REPORT PUBLICATION: Extracts of the above mentioned paper “All-Optical Passive Transistor” has appeared as Research Report in highly reputed Magazine Photonics Spectra of Laurin Publication (USA). The title of the report is “Theorists Propose an all-optical Transistor”, pp.106, May 2005.

2. Coupled spatial-soliton pairs in sautrable nonlinear media, S. Medhekar, Ram Krishna Sarkar and Punya Prasanna Paltani, Optics Letters, 31, 77 (2006).
3. Passive, “Self-trapped family” all-optical half adder using all-optical XOR and AND gates, Ram Krishna Sarkar and S. Medhekar, Czechoslovak journal of Physics, 56, 359 (2006).
4. Propagation of Doughnut Mode in Nonlinear Media, Ram Krishna Sarkar and S. Medhekar, Nonlinear Optics, Quantum Optics, 35, 275 (2006).
5. All-Optical Bistable and Astable Multivibrators, S. Medhekar and Ram Krishna Sarkar, Nonlinear Optics, Quantum Optics, 35, 287 (2006).
6. Spatial Soliton of desired intensity and width and their Self-Tapering / Uptapering in Cubic Quintic Nonlinear Medium, Ram Krishna Sarkar and S. Medhekar, Physica Scripta, 76, 683 (2007).
7. Soliton Pairing of Two Coaxially Co-Propagating Mutually Incoherent 1-D Beams in Kerr Type Media, S. Medhekar, Ram Krishna Sarkar and Punya Prasanna Plaltani, Optica Applicata, 37, 243 (2007).
8. Spatial Soliton Pairing of Two Cylindrical Beams in satarable Nonlinear Media, Ram Krishna Sarkar and S. Medhekar, Progress in Electromagnetics Reasearch M, 9, 53 (2009).
9. Mutual-Focusing of Two Co-Progagating Beams and Formation of Trapped Spatial Breather Pair in Saturable Nonlinear Media, Ram Krishna Sarkar and S. Medhekar, Optik, 121, 339 (2010).
10. Coupled Propagation in Electromagnetically Induced Transparent Medium; Thirring Type Soliton Pairs and Breather Pairs, Sharddha Prasad, Ram Krishna Sarkar, Arpita Srivastava and S. Medhekar, Journal of Electromagnetic Waves and Applications, 25, 923 (2011).
11. Coupled Tapered / Uptapered Beams, Arpita Srivastava, Ram Krishna Sarkar, Shraddha Prasad and S. Medhekar, Optik, 122, 2039 (2011).
12. Coupled Tapering / Uptapered of Soliton Pairs in Nonlinear Media, Shraddha Prasad, Ram Krishna Sarkar and S. Medhekar, Optik, 124, 6661 (2013).
13. Coupled Spatial Soliton Pair and Breather Pair Formation in Cubic Quintic Nonlinear Media, Surya Mallick and Ram Krishna Sarkar, Nonlinear  Optics, Quantum Optics, 47, 223 (2015).
14. Coupled tapering / uptapering of dark soliton pair in nonlinear media, Shraddha Prasad, Ram Krishna Sarkar and S. Medhekar, Optik, 126, 677 (2015).
15. Coupled soliton-breather, breather-breather and breather-soliton pair formation in Kerr type nonlinear media, Ram Krishna Sarkar and Surya Mallick, Optics Communication, 356, 141 (2015) .
16. Analysis of All-Optical Passive Transistor, Shraddha Prasad and Ram Krishna Sarkar, Nonlinear Optics, Quantum Optics, 48, 61 (2016).
17. Distinct Types of Coupled Propagation of Beams in Kerr Type Nonlinear Media, Ram Krishna Sarkar and Surya Mallick, Nonlinear Optics, Quantum Optics, 48, 161 (2017).
18. Coupled tapering / Uptapering of Thirring type soliton pair in nonlinear media, Shraddha Prasad, Manoj Kumar Dutta and Ram Krishna Sarkar, Optics Communications, 410, 356-360 (2018).
19. Investigation on quality enhancement of old and fragile artworks using nonlinear filter and histogram equalization techniques, Mohineet Kaur, Ram Krishna Sarkar and Manoj Kumar Dutta, Optik, 244, 167564 (2021).
20. Breather pair formation in holographic medium, Shraddha Prasad, Manoj Kumar Dutta and Ram Krishna Sarkar, Optik, 245, 167742  (2021).
21. Investigation of Coupled Self-Tapering / Self-Uptapering of Soliton Beams in Nonlinear Media, Ram Krishna Sarkar, Anjan Biswas and Sarang Madhekar, Optik, 232, 166511 (2021).
22. Coupled propagation of two beams in cubic quintic nonlinear medium, Ram Krishna Sarkar and Manoj Kumar Dutta, Optik, 227, 166093 (2021).
23. Fabrication and characterization of Cds-Cu2S thin film heterojunction diode using chemical bath depostion technique, M. K. Dutta, R. K. Sarkar and S. Karmakar, Bulgarian chemical communications, 53, 158(2021).
24. Comparative performance analysis of Fuzzy Logic and Particle Swarm Optimization (PSO) techniques for image quality improvement: With special emphasis to old and distorted folk paintings, Manoj Kumar Dutta, Mohineet Kaur and Ram Krishna Sarkar, Optik, 254, 168644 (2022).
25. Image quality improvement of old and distorted artworks using fuzzy logic technique Author links open overlay panel, Manoj Kumar Dutta, Mohineet Kaur and Ram Krishna Sarkar, Optik, 249, 168252 (2022).
26. Design and Performance Analysis of Feedback Based Contention Resolution Technique for Optical Burst Switching (Obs) Network in Nonlinear Medium, M. K. Dutta and R. K. Sarkar, Nonlinear Optics, Quantum Optics, 56, 39 (2022).
27. Effect of initial curvature on soliton pair and breather pair in holographic medium, Ram Krishna Sarkar and Manoj Kumar Dutta, Optik, 271, 170107 (2022).     
28. Application of Retinex and histogram equalisation techniques for the restoration of faded and distorted artworks: A comparative analysis, Manoj Kumar Dutta and Ram Krishna Sarkar, Optik, 272, 170201 (2023).
29. Tapering / Uptapering of Thirring Type Soliton Pair Using Parabolic Equation Approach, Shraddha Prasad, Manoj Kumar Dutta and Ram Krishna Sarkar, Optik, 273, 170369 (2023).
30. Electronic Properties, Linear and Nonlinear Performance of KAgCh (Ch = S, Se) Compounds: A First-Principles Study, Taieb Seddik, Debidatta Behera, Mohammed Batouche, Walid Ouerghui, Houda Ben Abdallah, Ram Krishna Sarkar, Mostafa M. Salah, Ahmed Shakerand, Sanat Kumar Mukherjee, Crystals, 13(5), 726 (2023).
31. Analysis of breather-soliton, breather-breather and soliton-breather pair creation in saturating nonlinear media, Ram Krishna Sarkar and Manoj Kumar Dutta, J Opt., DOI: https://doi.org/10.1007/s12596-023-01484-4 (2023).

PUBLICATIONS / PRESENTATIONS IN SEMINAR / CONFERENCE / SYMPOSIUM

1. All-Optical Passive Isolator, S. Medhekar and Ram Krishna Sarkar , Photonics-2004, International Conference onb Optoelectronics, Fiber Optics , Fiber optics, and Photonics , Cochin University, Cochin , Kerela , India , December 9-11, 2004. The paper was presented by me (Poster Presentation) and published in abstract book, pp. 121.
2. Study of cross focusing of two co-propagating coaxial laser beams in saturating nonlinear medium ,  Ram Krishna Sarkar , PBG-2005, the seminar on Optics of Photonics Band – Gap Materials, IIT Kharagpur, Kharagpur , West Bengal , India , October 28-30, 2005, The paper was presented by me (Poster Presentation).
3. Analysis of Co-propagating Laser Beams in Saturating Nonlinear and Radially Inhomogeneous Medium, Ram Krishna Sarkar, National Laser Symposium (NLS-5), December 2005, VIT, Vellore, Tamil Nadu, India. The Paper was accepted and published in abstract book, pp. 51.
4. Co-propagating beams in saturating nonlinear media, S. Medhekar and Ram Krishna Sarkar, NASDEC⁽²⁾-2006, National Seminar on Devices , Circuits  & Communications , B.I.T, Mesra, Ranchi , Jharkhand , India, November 2-4, 2006. The paper was presented by me (Oral Presentation ) and published in book form , pp. 141.
5. Soliton pairing in nonlinear media,  Ram Krishna Sarkar and S. Medhekar , Potonics-2006, International Conference on Optoelectronics, Fiber Optics and Photonics , University of Hyderabad , Hyderabad, Andhra Pradesh , India Decemeber 13-16, 2006. The paper was presented by me (Poster Presentation) and Published in abstract book, pp. 375.
6. Spatial Soliton Pairing in Radially Inhomogeneous Nonlinear Media, Ram Krishna Sarkar , Shraddha Prasad and S. Medhekar, ICONTOP-11, 2^nd International Conference on Trends in Optics & Photonics, 2011, SINP Auditorium , organised by University of Calcutta , Kolkata, West Bengal , India , December 7-9, 2011. The paper was presented (Oral Presentation) by me and published in book form, pp. 97.
7. Coupled Propagation of Solitonic Beams in Nonlinear Medium Under the Influence of Initial Curvature of the Beams and Absorption, Surya Mallick and Ram Krishna Sarkar, NCIPT-2016, National Coference on Improvised Plasma Technologies for Nanomaterials Processing and Applications, B. I. T., Mesra, Off-Campus Deoghar, Jharkhand, India, February 25-26, 2016. The paper was published in Conference proceedings, pp. 41.

Member, Optical Society of India