Dr. Sarang Medhekar

Professor
Department of Physics

5 years Integrated M. Sc. (Applied Physics);
Sem I:

• Basic Physics-I (for EVS and Life Sciences)

Sem II:

• Basic Physics-II (for EVS and Life Sciences)
• Modern Physics

 Sem V:

• Fiber and Integrated Optics

Sem VI:

• Electricity and Magnetism-II

Sem VII:

• Classical Mechanics-II

Sem VIII

• Atomic and Molecular Physics-II

Sem IX

• Nano-Photonics

2 years M. Sc. (Physics);
Sem I:

• Fiber and Integrated Optics

Sem II:

• Atomic and Molecular Physics

Sem III:

• Quantum Electronics

Sem IV:

•  Optoelectronics and Optical Computing

Ph. D. Coursework

• Nanophotonics and applications

1. Head Department of Physics 20.10.12 to 19.10.18
2. Head (i/c) Department of Physics since 20.10.18
3. Dean, School of Natural Sciences since 14th Nov.2017.
4. Executive Council Member since 21 Nov. 2017.
5. Chief Vigilance Officer since 29.7.16
6. Coordinator, International Studies & Research Cell from 1.11.12 to 29.10.13
7. Chairman, International Studies & Research Cell since 30.10.13.
8. Member IQAC since 10 June 2016

1. Department of Applied Physics, Birla Institute of Technology (Mesra), Deoghar Campus, Jasidih, Deoghar 814142, India
2. Department of Mathematical Sciences, Delaware State University, Dover, DE 19901-2277, USA

1. Sarang Medhekar (PI) and P. K. Barhai (Co-PI) received a research Grant of Rs. 3.10 Lakhs from UGC on 1 July 2003 for the project titled “Theoretical Investigation of Induced Nonlinear Optical Fiber Waveguides and Devices” (Project Reference No.: 10-25 /2003 (SR); Duration 3.5 years; Status: Completed.
2. Sarang Medhekar (PI) and P. K. Barhai (Co-PI) received a research Grant of Rs. 8.87 Lakhs from BRNS-DAE on 16 Feb. 2004 for the project titled “Investigation of the effects of higher order nonlinearities on optical pulse propagation in semiconductor doped glass fibers and waveguides” (Project Reference No.: 2003/34/19/BRNS/1951; Duration 4 years; Status: Completed.
3. Sarang Medhekar (PI) received a research Grant of Rs. 24.68 Lakhs from DST on 10.2.2009 for the project titled “Modeling and Analysis of Mach-Zhender Interferometer based Nonlinear Waveguide Devices for All-Optical Switching and Logic Gates” (Project Reference No.: SR/S2/LOP-27/2007; Duration 3 years; Status: Completed.
4. Sarang Medhekar (PI) received a research Grant of Rs. 8.278 Lakhs from UGC on 30.12.2008 for the project titled “Investigation of Optical Beam Propagation in Nonlinear Media: Spatial Soliton Formation and Their Interaction for All-Optical Devices” (Project Reference No.: 34-24/2008 (SR); Duration 3 years; Status: Completed.
5. Sarang Medhekar (PI) received a research Grant of Rs. 24.15 Lakhs from DST on 20.5.2013 for the project titled “Modeling and Analysis of all-optical switching devices based on waveguide and photonic crystal geometry” (Project Reference No.: SR/S2/LOP-0025/2012; Duration 3 years 4 Months; Status: Ongoing

In addition to above;

1. Supervised two (02) CSIR (SRF) projects. (completed)
2. Mentor of DST project under DST WOMEN SCIENTISTS SCHEME (WOS-A). (completed)

1. Mechanical load stabilizer with load dependent stepless gear ratio variation system, Inventor: S. Medhekar, Patent no. 223097, Year 2008.
2. Extraction of one beam from a mixture of two coaxially co-propagating mutually incoherent beams of same frequency,  Extraction of Data Bits loaded on one coherent beam mixed with the Data Bits loaded on another coherent beam of same frequency and Coherence Division Multiplexing (CDM), Inventor: S. Medhekar and Punya Prasanna Paltani, Patent no. 261064, Year 2014.
3. ALL-OPTICAL NOT/XOR, AND NAND GATES, ALL-OPTICAL BISTABLE, ASTABLE MULTIVIBRATORS AND ALL-OPTICAL HALF ADDER USING NOVEL ALL-OPTICAL SWITCHING IN A MACH-ZENDER INTEROFEROMETER Patent no. 296862, Year 2018.
4. ALL-OPTICAL PASSIVE TRANSISTOR ADAPTING A MACH-ZEHNDER INTERFEROMETER, Patent no. 304332, Year 2018.

Research publications (in Journals only)

2019

1. Alok Kumar and  Sarang  Medhekar, Wavelength Filter Based on Photonic Crystal Resonant Cavity Nonlinear Optics, Quantum Optics, (In press)
2. Alok Kumar and  Sarang  Medhekar, All optical NOT and NOR gates using interference in the structures based on 2D linear photonic crystal ring resonator, Optik - International Journal for Light and Electron Optics 179 (2019) 237–243

2018

1. Alok Kumar, Man  Mohan  Gupta and  Sarang  Medhekar, All-optical NOT and AND Gates based on 2D Nonlinear Photonic Crystal Ring Resonant Cavity, Optik-International Journal for Light and Electron Optics 167 (2018) 164–169

2016

1. Man Mohan Gupta and Sarang Medhekar, Asymmetric light reflection at the reflecting layer incorporated in a linear, time-independent and non-magnetic two-dimensional photonic crystal Euro Physics Letters, 114 (2016) 54002, doi: 10.1209/0295-5075/114/54002
2. Man Mohan Gupta and Sarang Medhekar, Three port asymmetric (three port ordered-route) light transmission in a linear, time-independent and non-magnetic structure of photonic crystals, Euro Physics Letters 113, 34004 (2016)
3. Man Mohan Gupta, Sarang Medhekar, All-optical NOT and AND gates using counter propagating beams innonlinear Mach–Zehnder interferometer made of photonic crystal waveguides, Optik-International Journal for Light and Electron Optics 127 (2016) 1221–1228

2015

1. A. H. Arnous, Mohammad Mirzazadeh, Seithuti Moshokoa, Sarang Medhekar, Qin Zhou,  M. F. Mahmood, Anjan Biswas, Milivoj Belic, Solutions in optical Meta maerials with trial solution approach and Backlund tranform of Riccati equation, Journal of Computational and Theoretical Nanoscience Vol. 12, 5940–5948, 2015
2. S Prasad, RK Sarkar, S Medhekar, Coupled tapering/uptapering of dark soliton pair in nonlinear media, Optik-International Journal for Light and Electron Optics 126 (2015) 677–680

2014

1. Man Mohan Gupta and Sarang  Medhekar, A versatile optical junction using photonic band-gap guidance and self- collimation, Applied Physics Letters 105, 131104 (2014); 105, 131104 (2014), doi: 10.1063/1.4896622
2. Man Mohan Gupta and S Medhekar, Switching Behavior of Nonlinear Mach-Zehnder Interferometer Based on Photonic Crystal Geometry, Pramana Vol. 82, No. 6, 2014, pp. 1061–1074.
3. R. K. Choubey S. Medhekar,  R. Kumar S. Mukherjee Sunil Kuma, Study of nonlinear optical properties of organic dye by Z-scan technique using He–Ne laser, J Mater Sci: Mater Electron, DOI 10.1007/s10854-014-1743-3, Jan 2014.

2013

1. Shraddha Prasad, Ram Krishna Sarkar and  Sarang Medhekar, Coupled tapering/uptapering of soliton pairs in nonlinear media, Optik-International Journal for Light and Electron Optics.,  124 (2013) 6661–  6665, http:// dx.doi.org/ 10.1016/ j.ijleo.2013.05.108.

2012

1. Arpita Srivastava Sarang Medhekar, Effect of change in core width and core refractive index on the switching behaviour of a nonlinear Mach–Zehnder interferometer, Optical Engineering 51(9), 094601 (September 2012).
Arpita Srivastava and S. Medhekar, Switching Behavior of a Nonlinear Mach-Zehnder Interferometer with Exponentially Saturable Nonlinearity, Optical Engineering , Vol. 51, Pages 074604-1 to 074604-4, 2012.
3. D. B. Lata, A. Mishra and S. Medhekar, Effect of hydrogen and LPG addition on the efficiency and emissions of a dual fuel diesel engine, International Journal of Hydrogen Energy Vol. 37, Pages 6084–6096, 2012.

2011

1. Arpita Srivastava, Man Mohan Gupta, S. Medhekar, Signal amplification based on the local nonlinear Mach–Zehnder interferometer, Optics & Laser Technology, Vol. 44, 492–496, 2011.
2. D. B. Lata, A. Mishra and S. Medhekar, Investigations on the combustion parameters of a dual fuel diesel engine with hydrogen and LPG as secondary fuels, International Journal of Hydrogen Energy Vol. 36, 13808–13819, 2011.
3. Shraddha Prasad, Ram Krishna Sarkar, Arpita Srivastava and S. Medhekar, Coupled Propagation in Electromagnetically Induced Transparent Medium; Thirring Type Soliton Pairs and Breather Pairs, Journal of Electromagnetic Waves and Application, Vol. 25, 923–933, 2011.
4. Arpita Srivastava, S. Medhekar, Switching behavior of a nonlinear Mach–Zehnder interferometer: Saturating nonlinearity, Optics & Laser Technology, Vol. 43, Pages 1208 to 1211, 2011.
5. Arpita Srivastava, Ram Krishna Sarkar, Shraddha Prasad and S. Medhekar, Coupled tapered / uptapered optical beams, Optik-International Journal for Light and Electron Optics., 122 (2011) 2039– 2043.
6. Arpita Srivastava and S. Medhekar, Switching of One Beam by Another in a Kerr Type Nonlinear Mach-Zehnder Interferometer, Optics & Laser Technology, vol. 43, issue 1, pp. 29-35(2011).
7. Punya Prasanna Paltani and S. Medhekar, All-optical Circulator Based on Cross Phase Modulation in a Nonlinear Mach-Zehnder Interferometer, Optik-International Journal for Light and Electron Optics., Volume 122, Issue 5, March 2011, Pages 464-466.
8. Punya Prasanna Paltani and S. Medhekar, Optimally Stabilized Beam Pairs, Optik-International Journal for Light and Electron Optics., vol. 122, issue 1, pp. 70-75(2011).

2010

1. Arpita Srivastava, Punya Prasanna Paltani and S. Medhekar, Switching Behaviour of a Nonlinear Mach-Zehnder Interferometer, Pramana, Vol.74 Number 4 (2010) p. 575-590.
2. Ram Krishna Sarkar and S. Medhekar, Mutual-focusing of two co-propagating beams and formation of trapped spatial breather pair in saturable nonlinear media, Optik-International Journal for Light and Electron Optics., 121 (2010) p-339–346.

2009

1. R. K. Sarkar and S Medhekar, Spatial soliton pairing of two cylindrical beams in saturable nonlinear media, Progress In Electromagnetics Research M, Vol. 9, 53-64, 2009.
2. S. Medhekar and Punya prasanna Paltani, All-Optical transistor using counter propagating beams in a Nonlinear Mach-Zehnder Interferometer, Fiber and Integrated Optics Vol. 28 Number 4 (2009) p. 268-274.
3. S. Medhekar and Punya prasanna Paltani, Novel All-Optical Switch using Nonlinear Mach-Zehnder Interferometer, Fiber and Integrated Optics Vol.28 Number 3 (2009) p. 229-236.

2007

1. S. Medhekar, Ram Krishna Sarkar and Punya P. Paltani, Soliton Pairing of Two Coaxially Co-Propagating Mutually Incoherent 1-D Beams in Kerr Type Media, Optica Applicata, XXXVII, 243-259 (2007).
2. Ram Krishna Sarkar and S. Medhekar, Spatial Solitons of desired intensity and width and their Self-Tapering/Uptapering in Cubic Quintic Nonlinear Medium, Physica Scripta, Vol. 76, (2007) pp-683-688.
3. Punya P. Paltani and S. Medhekar, Synchronous Couplers Made of Symmetric and Asymmetric Slabs, Nonlinear Optics, Quantum Optics Vol. 36 , (2007) pp-129-145.
4. S Medhekar and Punya Prasanna Paltani, All-Optical Switching and Tenable Wavelength Filtering in Grating Assisted Directional Coupler, Nonlinear Optics, Quantum Optics Vol. 36 , (2007) pp-81-90.

2006

1. S. Medhekar and Punya Prasanna Paltani, Proposal for an All-Optical Switch, IEEE Photonics Technology Letters Vol. 18, No. 15 Aug. (2006) pp-1579-1581.
2. S Medhekar and Ram Krishna Sarkar, Passive, ‘Self-Trapped Family” All-Optical Half Adder using All-Optical X-OR and AND Gate, Czechoslovak J. Physics, Vol. 56, No. 4 (2006) pp-359-366.
3. S Medhekar and Ram Krishna Sarkar, All-optical bistable and astable multivibrators, Nonlinear Optics, Quantum Optics, vol. 35, Sept. 2006, pp-287-296.
4. S Medhekar, R. K. Sarkar and P. P. Paltani, Coupled Spatial-Soliton Pairs in Saturating Medium, Optics Letters vol. 31, No. 1 Jan. 2006, pp-77-79.
5. Ram Krishna Sarkar and S Medhekar, Propagation of Doughnut mode in Nonlinear Media, Nonlinear Optics, Quantum Optics Vol. 35, Sept. (2006) pp-275-286.

2005

1. S Medhekar and Ramkrishna Sarkar, All-optical Passive Transistor, Optics Letters, vol. 30, No. 8, April 2005, pp-887-889

2003

1. S.Konar, P.K.Barhai and S Medhekar, Displacement and Deflection of Optical Beams by Nonlinear Planer Waveguide, J. of Nonlinear Optical Physics & Materials, Vol. 12, No. 1, p.101-112 (2003) USA.

1996

1. S Medhekar, M.S.Sodha and S.Konar, Optical Power filter: A new kind of passive nonlinear optical device, Optics Letters, Vol.20, No.4, p-305(1996).

1995

1. S Medhekar, S. Konar and M.S.Sodha, Self tapering of elliptic beams in elliptic core nonlinear fibers, Optics Letters, Vol.20, No.21, p-2192 (1995).
2. S Medhekar, S.Konar and Rajkamal, Successive uptapering and stationary self trapped propagation of a laser beam in a saturating nonlinear medium, Lasers & Particle Beams, Vol.13, No.4, p-559 (1995).
3. S Medhekar, S.Konar and Rajkamal, Profile of radial inhomogeinity for stationary self trapped propagation of laser beams in a nonlinear absorbing/amplifying medium with arbitrary nonlinearity, IL NUOVO CIMENTO D, Vol.17, p-351,(1995).
4. S. Medhekar, S.Konar and Rajkamal, Self tapering and uptapering of a self guided laser beam in an absorption/gain medium with arbitrary nonlinearity, Pramana-Journal of physics, vol.44, No.3, p-249(March1995).

1994

1. M.S.Sodha, S. Medhekar, S.Konar, A.Saxena and Rajkamal, Absorption/Amplification induced self tapering and uptapering of a laser beam in a saturable nonlinear medium: large nonlinearity, Optics Letters, Vol.19, No.15, p-1110(Aug.1st 1994).

1993

1. S. Medhekar, Rajkamal and A.Saxena, Propagation of Gaussian laser beams in a nonlinear radially inhomogeneous absorbing medium with arbitrary nonlinearity, Ind. J. Pure & Appl. Phys.Vol.31, p-605-609(Sept.1993).

1991

1. S. Medhekar, Maximum possible transverse velocity in special relativity, Physics Education, Vol.7, No.4, p-320-322(1991).
   

Books and Book Chapters (Published/ Accepted) : NIL

Work published/presented/abstracted in National/International conference/conference proceedings;

1. S. Medhekar et. al. “Self tapering/uptapering of self guided beams” National laser symposium held at Center for Advanced Technology, C.A.T., Indore, INDIA during Jan.29-Feb.1, 1994.
2. S. Medhekar et. al. “Paper on optical device” presented in 11th M.P.Young scientists congress held at Rani Durgavati Univ., Jabalpur, INDIA during Feb.28-March 1st 1996
3. S. Medhekar et. al. “Highly sensitive optical power filters”, Photonics-96, international conference on photonics and related areas held during 9-13 Dec.1996 at Indian Institute of Technology IIT, Chennai, INDIA.
4. Sarang Medhekar, S Konar, P.K.Barhai, “All-optical pulse width manipulation of stationary temporal soliton” Photonics-2002, International conference on photonics and related areas held in Dec.2002 at Tata Institute of Fundamental Research, Mumbai, INDIA.
5. Ram Krishna Sarkar, S. Medhekar, and Punya Prasanna Paltani, “Analysis of Cross focusing of Gaussian beams in Saturating Nonlinear medium”, National Laser Symposium (NLS-4), , held in Dec.2004 at Bhabha Atomic Research Centre, Mumbai, INDIA.
6. S. Medhekar and Ram Krishna Sarkar, “All-optical passive Isolator”, Photonics 2004, International conference on photonics and related areas held in Dec.2004 in Cochin, INDIA, pp-121.
7. S. Medhekar and Ram Krishna Sarkar, “Propagation of doughnut mode in various nonlinear media”, Asia Pacific Microwave Conference, International conference held in Dec.2004 in New Delhi, INDIA..
8. Punya P. Paltani and S. Medhekar “Synchronous Couplers: Symmetric and Asymmetric Directional Coupler”. Seminar on Optics of Photonic Band gap Materials, 28-30 Oct 2005 at IIT Kharagpur, INDIA
9. Punya P. Paltani and S. Medhekar, “Study of Grating Assisted Directional Couplers” National Laser Symposium “NLS-5”, 7-10 Dec. 2005 at Vallore Institute of Technology, Vallore, INDIA.
10. Ram Krishna Sarkar and S. Medhekar, “Soliton pairing in nonlinear media”, Photonics-2006, 3-16 Dec 2006 at University of Hyderabad, INDIA. page-375.
11. Punya P. Paltani and S. Medhekar “Switching Behaviour of Nonlinear Refraction Based optical Switch”. ‘Photonics 2006’ 3-16 Dec 2006 at University of Hyderabad, INDIA. page-137.
12. Punya P. Paltani and S. Medhekar, “Theoretical Investigation of Directional Couplers and Their Synchronization”. ‘CODEC-06’, 18-20 Dec 2006 at University of Kolkata, INDIA. page-205.
13. S. Medhekar and Ram Krishna Sarkar, "Co-propagating beams in saturating nonlinear media”, NASDEC (2)-06, 2-4 Nov. 2006 at Birla Institute of Technology, Mesra, INDIA page-141.
14. Punya P. Paltani and S. Medhekar, “Analysis of Nonlinear Refraction Using Split Step Method”, NASDEC (2)-06, 2-4 Nov. 2006 at Birla Institute of Technology, Mesra, INDIA page-151.
15. S. Medhekar and Ram Krishna Sarkar, “Analysis of Trapped Spatial Breather Pair in Saturable Nonlinear Media”, National Laser Symposium (NLS-6), 5-8 Dec. 2006 at Raja Raman Center for Advanced Technology, Indore, INDIA. page-70.
16. Punya P. Paltani and S. Medhekar “Solitonic and Nearly Solitonic Beam Pairs” National Laser Symposium (NLS-6), 5-8 Dec. 2006 at Raja Raman Center for Advanced Technology, Indore, INDIA, page-69.
17. Attended Short term course on AutoCAD and Pro-E held in Nov. Dec. at Birla Institute of Technology, Mesra, Ranchi-835215
18. Shraddha Prasad, Ram Krishna Sarkar, Arpita Srivastava and S. Medhekar “THIRRING TYPE BREATHER PAIRS AND SOLITONS”, PHOTONICS 2010: 10th International Conference on Fiber Optics & Photonics, December 11-15, 2010, IIT Guwahati, India.
19. S. Medhekar, Arpita Srivastava and Punya Prasann Paltani “PULSE SWITCHING IN A NONLINEAR MACH-ZEHNDER INTERFEROMETER”, PHOTONICS 2010: 10th International Conference on Fiber Optics & Photonics, December 11-15, 2010, IIT Guwahati, India.
20. Arpita Srivastava, Man Mohan Gupta and S. Medhekar “SIGNAL AMPLIFICATION BY USING A NONLINEAR MACH-ZEHNDER INTERFEROMETER”, PHOTONICS 2010: 10th International Conference on Fiber Optics & Photonics, December 11-15, 2010, IIT Guwahati, India.
21. P.P.Paltani, S.Medhekar, C. Senel, F.O.Ilday “ACCURATE GAIN MODELING FOR Er/Yb DOPED FIBER AMPLIFIER”PHOTONICS 2010: 10th International Conference on Fiber Optics & Photonics, December 11-15, 2010, IIT Guwahati, India.
22. Arpita Srivastava, Man Mohan Gupta and S. Medhekar “Switching Behavior of a Nonlinear Mach-Zehnder Interferometer With Different Saturable Nonlinearities”, Second International Conference on Trends in Optics and Photonics (IConTOP) December 7 - 9, 2011, Kolkata, India.
23. Man Mohan Gupta, Arpita Shrivastava and S. Medhekar “Switching Behavior of Photonic Crystal based Nonlinear Mach-Zehnder Interferometer”, Second International Conference on Trends in Optics and Photonics (IConTOP) December 7 - 9, 2011, Kolkata, India.
24. Ram Krishna Sarkar, Shraddha Prasad and S. Medhekar “Spatial Soliton Pairing in Radially Inhomogeneous Nonlinear Media” Second International Conference on Trends in Optics and Photonics (IConTOP) December 7 - 9, 2011, Kolkata, India.
25. S. Medhekar, R. Kumar, S.Mukherjee and R. K. Choubey “Study of Nonlinear Refraction of Organic Dye by Z-scan Technique using He–Ne Laser” AIP Conf. Proc. 1512, 470 (2013); 3–7 December 2012 Indian Institute of Technology, Bombay, Mumbai, India

Distinction

1. Extracts of the paper entitled “All-Optical Passive Transistor” has appeared as a report entitled “Theorists propose an all-optical Transistor” in  PHOTONICS SPECTRA of Laurin Publication (USA)., pp.106, May 2005.

Fellowships/scholarships/memberships/selection etc.

1. Selected and participated in 3 week Leadership for Academicians Program (LEAP) of  Ministry of Human resource and Development (MHRD), Govt. of India organized by Indian Institute of Technology, Banaras Hindu University (IIT, BHU) in collaboration with Penn State University, USA, which is a top ranked University in standard global rankings. The program was conducted from 25th February, 2019 to 9th March, 2019 at IIT (BHU), India and from 11th March, 2019 to 15th March, 2019 at Penn State University, USA.
2. Visiting Research Professor at University of Hartford CT, USA during 25th Dec. 2007 to 16th Jan. 2008 and 7th July 2008 to 12th Aug. 2008 for a collaborative research work to demonstrate the proof-of-concept (POC) feasibility of All-Optical Passive Transistor (AOPT) proposed by me with my Ph. D. student Mr. Ram Krishna Sarkar.
3. Life Member: Indian Association of Physics Teachers IAPT
4. Selection for CSIR associate ship 1996
5. Recipient of OPTEL fellowship for  Ph D research work in the area of Fibre Optics (19910-1994).