Publications

2025:

1.Soumik Nandi, Arannya Ghosh, Dinesh Beniwal, Abhishek Mondal, Ashok K. Mohapatra, and Ritwick Das, "All-optical Stern-Gerlach effect in a parity-time anti-symmetric nonlinear refractive medium," Opt. Express 33, 24237-24248 (2025)

2024:

Bommakanti, Suresh, Satyapriya Nath, Rudrashish Panda, Sankalpa N. Panda, Jeebanjyoti Mohapatra, Adithyan Puthukkudi, Chetan V. Rajput, Sharmistha Anwar, Ritwick Das, and Bishnu P. Biswal. "Octupolar Cyclotriphosphazene-Cored Self-Standing Covalent Organic Framework Membranes as Nonlinear Optical Materials: Impact of Linkage Types and Material Forms." The Journal of Physical Chemistry Letters 15, no. 18 (2024): 4965-4975. .
Murali, A. C., Panda, R., Kannan, R., Das, R., & Venkatasubbaiah, K. (2024). O, S-Chelated bis (pentafluorophenyl) boron and diphenylboron-β-thioketonates: synthesis, photophysical, electrochemical and NLO properties. Dalton Transactions, 53(42), 17263-17271.
Sahoo, S., Surbhi, K., Bhakta, S., Das, R., & Sahoo, P. K. (2024). Influence of defects on the linear and nonlinear optical properties of Cu-doped rutile TiO 2 microflowers. Physical Chemistry Chemical Physics, 26(13), 10191-10201.
Bommakanti, S., Nath, S., Panda, R., Das, R., & Biswal, B. P. (2024). Cyclotriphosphazene-based organic frameworks as third-order nonlinear optical materials. Materials Advances, 5(3), 1017-1021.

2023:

Km. Surbhi, U.P. Sahoo, P.K. Sahoo, Ritwick Das, “WSe2 thin-films as efficient optical limiters: A study on impact of annealing,” Optical Materials, vol. 144, pp. 114255 (2023).
Abhishek Mondal, Shailja Sharma, and Ritwick Das, “ All-dielectric apodized photonic crystals: A nondissipative pseudo-Hermitian system hosting multiple exceptional points,” Phys. Rev. A, vol. 107, pp. 053502 (2023).
A. C. Murali, P. Nayak, R. Panda, Ritwick Das, K. Venkatasubbaiah, “Red-Emitting Tetraphenylethylene-Based Boron Thioketonates: Effect of Substitution and Study of Nonlinear Optical Properties,” ACS Applied Optical Materials, vol. 5, pp. 1033-1042 (2023).

2022

Km. Surbhi, S. Bhakta, P.K. Sahoo, Ritwick Das “Impact of defects on the optical nonlinearity of sputtered WSe2 thin films in the opticalcommunication band,” J. Appl. Phys., vol. 132, pp. 243101 (2022).
Anupa Kumari, P. Nayak, B. Patra, K. Venkatasubbaiah, Ritwick Das, “Third-order nonlinear optical manifestations in an intramolecular proton transfer fluorophore due to Tamm-plasmon based broadband optical absorbers,” J. Opt. Soc. Am. B, vol. 39, pp. 2857-2862 (2022).
Rashmi Rekha Sahoo, Mukesh Kumar Shukla and Ritwick Das, “Stimulated polariton scattering in an Yb laser pumped lithium niobate based continuous-wave singly resonant optical parametric oscillator,” J. Opt. Soc. Am. B, vol. 39, pp. 2670-2677(2022).
S. Jena, K.D. Tulsiyan, Anupa Kumari, Ritwick Das, Himansu S. Biswal, “Thiolumazines as Heavy-Atom-Free Photosensitizers for Applications in Daylight Photodynamic Therapy: Insights from Ultrafast Excited-State Dynamics,” J. Phys. Chem. B, vol. 126 (32), pp. 6083–6094 (2022).
Abhishek Mondal, Shailja Sharma, and Ritwick Das, “Geometric manifestation led optical beam shaping in one-dimensional photonic crystals,” J. Opt. Soc. Am. B, vol. 39, pp. 2429-2434 (2022)
Abhishek Mondal and Ritwick Das, “Experimental evidence of a pump-wavefront-induced Stern–Gerlach-like splitting in optical parametric generators,” Optics Letters, vol. 47, pp. 3668-3671 (2022).
V. Mukundam, S. Sa, A. Kumari, T. T. Ponduru, Ritwick Das, K. Venkatasubbaiah, “Synthesis, photophysical, electrochemical and non‐linear optical properties of Triaryl Pyrazole‐based B‐N coordinated Boron compounds,” Chemistry–An Asian Journal, vol. 17, pp. e2022002 (2022).
Km. Surbhi, S. Bhakta, A. Kumari, U.P. Sahoo, P.K. Sahoo, Ritwick Das, “Impact of pauli-blocking effect on optical limiting properties of WSe2 thin films,” Optical Materials, vol. 129, pp. 112479 (2022).
A. Singh, P. Dey, A. Kumari, M. K. Sikdar, P. K. Sahoo, Ritwick Das and T. Maiti, “Temperature-dependent excitonic emission characteristics of lead-free inorganic double perovskites and their third-order optical nonlinearities,” Physical Chemistry Chemical Physics, vol. 24, pp. 4065-4076 (2022).

2021

Shailja Sharma, Abhishek Mondal, and Ritwick Das, “Geometric representation of adiabatic distributed-Bragg-reflectors and broadening the photonic bandgap,” Optics Express, vol. 29, pp. 43303-43315 (2021).
Shailja Sharma, Abhishek Mondal, and Ritwick Das, “Infrared rainbow trapping via optical Tamm modes in one-dimensional dielectric chirped photonic crystals,” Optics Letters, vol. 46, pp. 4566-4569 (2021).
Abhishek Mondal and Ritwick Das, “Pump-induced thermo-optic manifestation lead adiabatic ultrashort-pulse optical parametric generation in long LiNbO3 crystals,” Journal of Optics, vol. 23, pp. 104002 (2021).
M. Alrefaee, R. Panda, P. K. Sahoo, Ritwick Das, P. K. Datta, S. K. Das, “Second harmonic generation of femtosecond laser pulses of central wavelength 1000 nm, 1100 nm and 1300 nm using ZnO Nanorods, Optical and Quantum Electronics, in press (2021).
R. R. Sahoo, M.K. Shukla and Ritwick Das, “Thermo-optic effects in congruent-LiTaO3based continuous-wave optical parametric oscillator,” IEEE Photonics Technology Letters, vol. 33, pp. 1069 - 1072 (2021).
S. Sa, V. Mukundam, A. Kumari, Ritwick Das and K. Venkatasubbaiah“Synthesis of pyrazole anchored three-coordinated organoboranes and their application in the detection of picric acid,” Dalton Transactions, vol. 5, pp. 6204-6212 (2021).

2020

M. K. Shukla, and Ritwick Das, “Optical edge modes in Thue–Morse sequence-based distributed reflector,” Journal of Physics D: Applied Physics, vol. 53, pp. 495101 (2020).
Akash Srivastava, Ritwick Das, Y. K. Prajapati*,“Effect of perovskite material on the performance of SPR biosensor,”IET Optoelectronics, DOI: 10.1049/iet-opt.2019.0122.(2020).
Akash Srivastava, Alka Verma, Ritwick Das, Y. K. Prajapati,“A theoretical approach to improve the performance of SPR biosensor using MXene and black phosphorus,” Optik,vol. 203, pp. 163430 (2020).
V. Mukundam,S. Sa, A. Kumari, A.C. Murali, P. Nayak, Ritwick DasandK. Venkatasubbaiah, “Synthesis of π-extended B ← N coordinated phenanthroimidazole dimers and their linear and nonlinear optical properties,” Dalton Transactions, vol. 9, pp. 7737-7746 (2020).
J. N. Dash, R. Jha, R. Das, “Micro-air cavity incorporated tapered-tip photonic crystal fiber based compact refractometer,” Laser Physics Letters, vol. 17, pp. 055101 (2020).

2019

1. J. N. Dash, R. Jha and Ritwick Das, “Enlarge-Tapered, Micro-air Channelled Cavity for Refractive Index Sensing in SMF,” Journal of Lightwave Technology, vol. 37, pp. 5422 - 5427 (2019).

2. V. Mukundam,S. Sa, A. Kumari,Ritwick Das and K. Venkatasubbaiah, “B–N coordinated triaryl pyrazole: effect of dimerization, and optical and NLO properties,” Journal of Material Chemistry C, vol. 7, pp. 12725 (2019).

2018

1. Mukesh K. Shukla and R. Das, “Tamm-plasmon polaritons in one-dimensional photonic quasi-crystals” Optics Letters, vol. 43, pp. 362-365 (2018).

2. M. Chhabra and R. Das, “Probing students’ conceptions at classical - quantum interface,” European Journal of Physics, vol. 39, pp. 025710 (2018).

3. M. K Shukla, R. Das, “High-power, single-frequency source in the mid-infrared using a singly-resonant optical parametric oscillator pumped by Yb-fiber laser,” Journal of Selected Topics in Quantum Electronics, vol. 24, 5100206 (2018).

4. Partha S. Maji, Mukesh. K. Shukla, R. Das, “Blood component detection based on miniaturized self-referenced hybrid Tamm-plasmon-polariton sensor,” Sensors and Actuators B, vol. 255, pp. 729-734 (2018).

5. Partha Sona Maji and Ritwick Das, “Absorption enhancement in monolayer graphene using Tamm plasmon polaritons,” OSA Continuum, vol. 1, pp. 392-400 (2018).

6. Jitendra Narayan Dash and Ritwick Das, “SPR based magnetic-field sensing in microchannelled PCF: a numerical approach,” Journal of Optics, vol. 20, pp. 115001 (2018).

7. Samir Kumar and Ritwick Das, “Refractive index sensing using a light trapping cavity: A theoretical study,” Journal of Applied Physics, vol. 123, pp. 233103 (2018).

8. Anupa Kumari, Samir Kumar, Mukesh Kumar Shukla, Govind Kumar, Partha S. Maji, Ramarao Vijaya and Ritwick Das, “Coupling to Tamm-plasmon-polaritons: Dependence on structural parameters,” Journal of Physics D: Applied Physics, vol. 51, pp. 255103 (2018).

9. Jitendra Narayan Dash, Ritwick Das, and Rajan Jha, “AZO Coated Microchannel Incorporated PCF-Based SPR Sensor: A Numerical Analysis,” IEEE Photonics Technology Letters, vol. 30, pp. 1032-1035 (2018).

2017

1. S. Kumar and R. Das, “On the tun-ability of quality-factor for optical Tamm plasmon modes,” Journal of Optics vol. 19, pp. 095001 (2017).

2. S. Kumar, M. K. Shukla, P. S. Maji and R. Das, “Self-referenced refractive index sensing with hybrid-Tamm-plasmon-polariton modes in sub-wavelength analyte layers,” Journal of Physics D: Applied Physics, vol. 50, pp.375106 (2017).

3. P. S. Maji, R Das, “Hybrid-Tamm-Plasmon-Polariton Based Self-Reference Temperature Sensor,” Journal of Lightwave Technology, vol. 35 (14), pp. 2833-2839 (2017).

4. Samir Kumar, Partha Sona Maji, Ritwick Das, “Tamm-plasmon resonance based temperature sensor in a Ta2O5/SiO2 based distributed Bragg reflector,” Sensors and Actuators A: Physical, vol. 260, pp. 10-15 (2017).

2016

1. S. Kumar, K.V. Anil Kumar, S.M. Dharmaprakash, and R. Das, “Phase-dependent ultrafast third-order optical nonlinearities in metallophthalocyanine thin films,” Journal of Applied Physics, vol. 120, pp. 123104 (2016).

2. M. K. Shukla, P.S. Maji and R. Das “Yb-fiber laser pumped high-power, broadly tunable, single-frequency red source based on a singly resonant optical parametric oscillator,” Optics Letters, vol. 41, pp. 3033-3036 (2016).

3. M. K Shukla, S. Kumar, R. Das, “Single-pass, efficient type-I phase-matched frequency-doubling of high-power ultrashort-pulse Yb-fiber laser using LiB3O5”, Applied Physics B, vol. 122, pp. 114 (2016).

4. M. Chhabra, R. Das, “Quantum mechanical wavefunction: Visualization at undergraduate level,” European Journal of Physics, vol. 38, pp. 015404 (2016).

5. K.V. Anil Kumar, S. Kumar, S.M. Dharmaprakash, and Ritwick Das, “Impact of α→ β Transition in the Ultrafast High-Order Nonlinear Optical Properties of Metal-Free Phthalocyanine Thin Films” Journal of Physical Chemistry C, vol. 120, pp. 6733–6740 (2016).

2015

1. M. K. Shukla, S. Kumar, R. Das, “Single-pass, multi-watt second-harmonic-generation in congruent and stoichiometric LiTaO3” IEEE Photonics Technology Letters, Vol. 27, pp. 1379-1382 (2015).

2. A. Singh, S. Kumar, R. Dasand P. K. Sahoo “Defect-assisted saturable absorption characteristics in Mn doped ZnO Nano-rods,” RSC Advances, vol. 5, pp. 88767–88772 (2015).

3. A. Garai, S. Kumar, W. Sinha, C. S. Purohit, Ritwick Das and Sanjib Kar, “A comparative study of optical nonlinearities of trans-A2B-corroles in solution and in aggregated state,” RSC Advances, Vol. 5, pp. 28643–28651 (2015). DOI: 10.1039/c5ra03568f

4. Ritwick Das, T. Srivastava, Rajan Jha, “On the performance of Tamm-plasmon and surface-plasmon hybrid-mode refractive-index sensor in metallo-dielectric heterostructure configuration,” Sensors & Actuators: B. Chemical, Vol. 206, pp. 443-448 (2015).

5. T. Srivastava, Ritwick Das, P. Padhy, R. Jha, “THz mode‑coupling in photonic‑crystal–surface‑plasmon‑coupled waveguides,” Applied Physics B, vol. 118, pp. 387-392 (2015). DOI 10.1007/s00340-014-5996-6.

2014

1. Awanish Pandey and Ritwick Das, “Distributed-Bragg-reflector assisted tailoring of extraordinary transmission spectrum for sub-wavelength hole-array,” Plasmonics, Vol. 9, pp. 1315-1321 (2014).

2. Ritwick Das, “Optical Tamm mode based refractometer in all-dielectric configuration,” Photonics and Nanostructures: Fundamental and Applications, Vol. 12, pp. 252-258 (2014).

3. Ritwick Das and M. K. Shukla, “Measurement of nonlinear refractive index in open-aperture Z-scan experiments,” Pramana Journal of Physics, in press (2014). DOI 10.1007/s12043-014-0819-1

4. Ritwick Das, T. Srivastava, and Rajan Jha, “Guided-mode Analysis of Tamm-Plasmon Polariton at Metal-Heterostructure Dielectric Interface,” IEEE/OSA Journal of Lightwave Technology, Vol. 32, pp.1221-1227 (2014).

5. Ritwick Das, T. Srivastava and Rajan Jha, “Tamm-plasmon and surface plasmon hybrid-mode based refractometry in photonic bandgap structures,” Optics Letters, Vol. 39, pp. 896-899 (2014).

2013

1. T. Srivastava, Ritwick Das, Rajan Jha, “Mode-coupling between surface plasmon modes and bandgap-guided modes: A comprehensive study and applications,” IEEE/OSA Journal of Lightwave Technology, Vol. 31, pp. 3518-6524 (2013).

2. T. Srivastava, Ritwick Das, Rajan Jha, “Highly sensitive plasmonic temperature sensor based on photonic crystal surface plasmon waveguide,” Plasmonics, Vol. 8, pp. 515-521 (2013).

2012

1. T. Srivastava, Ritwick Das, Rajan Jha, “On the high performance of channel photonic crystal waveguide comprising different plasmonic active metals,” Applied Physics BVol. 108, pp.629-634 (2012).

2011

1. T. Srivastava, Rajan Jha, Ritwick Das, “High-Performance Bimetallic SPR sensor based on Photonic Crystal-Waveguides,” IEEE Photonics Technology Letters, vol. 23, pp. 1448-1450 (2011).

2. T. Srivastava, Ritwick Das, Rajan Jha, “Highly accurate and sensitive surface plasmon resonance sensor based on channel photonic crystal waveguides,” Sensors and Actuators B, vol. 157, pp. 246-252 (2011).

3. S. Chaitanya Kumar, Ritwick Das, G. K. Samanta, and M. Ebrahim-Zadeh, “Optimally-out-coupled, 17.5 W, Yb-fiber-laser-pumped continuous-wave, MgO:PPLN optical parametric oscillator”, Applied Physics B, vol. 102, pp. 31-35 (2011).

2010

1. Triranjita Srivastava, Ritwick Das and Rajan Jha “Design considerations and propagation characteristics of channel Bragg-plasmon-coupled-waveguides,” Applied Physics Letters, vol. 97, pp. 213104 (2010).

2009

1. Ritwick Das, S. Chaitanya Kumar, G. K. Samanta, and M. Ebrahim-Zadeh, “Broadband, high-power, continuous-wave, mid-infrared source using extended phase-matching bandwidth in MgO:PPLN”, Optics Letters, vol. 34, pp. 3836-3838 (2009).

2. Ritwick Das, “Ultra-broadband optical parametric amplification by tailoring the group-velocity-dispersion of Bragg reflection waveguides”, Journal of Physics D: Applied Physics, vol. 42, pp. 235106 (2009).

3. Ritwick Das and K. Thyagarajan, “Broadband mid-infrared generation by difference-frequency-generation in strongly dispersive Bragg reflection waveguides”, Journal of Applied Physics, vol. 106, pp. 093101 (2009).

4. Ritwick Das and K. Thyagarajan, “Ultra-broadband mid-infrared generation using non-degenerate difference-frequency-generation in group-velocity-dispersion tailored Bragg reflection waveguides”, Applied Optics, vol. 48, pp. 5678-5682 (2009).

5. Ritwick Das and Rajan Jha, “On the modal characteristics of surface-plasmon polaritons at a metal-Bragg interface at optical frequencies”, Applied Optics, vol. 48, 4904-4908 (2009).

6. Ritwick Das and K. Thyagarajan, “Strong dispersive features of dual Bragg cladding waveguides using higher-order mode-coupling mechanism”, Journal of Optics A: Pure and Applied Optics, vol. 11, pp. 105410- (2009).

7. G.K. Samanta, S. Chaitanya Kumar, Ritwick Das, and M. Ebrahim-Zadeh, “Continuous-wave optical parametric oscillator pumped by a fiber laser green source at 532 nm”, Optics Letters, vol. 34, pp. 2255-2257 (2009). *Also selected/listed for Virtual Journal of Ultrafast Science (Published by AIP), September (2009), scitation.aip.org/ultrafast/

2008

1. Krishna Thyagarajan, Ritwick Das, Olivier Alibart, Marc de Micheli, Daniel B. Owstrosky, Sébastien Tanzilli “Increased pump acceptance bandwidth in spontaneous parametric down conversion process using Bragg reflection waveguides”, Optics Express, vol. 16, pp. 3577-3582 (2008).

2. Ritwick Das and K. Thyagarajan, “Broadband parametric amplification in Bragg reflection waveguide”, Journal of Modern Optics,vol. 55, pp. 273-279 (2008).

2007

1. Ritwick Das and K. Thyagarajan, “Broadening of the phase-matching bandwidth in quasi-phase matched second harmonic generation using GaN based Bragg reflection waveguide”, Optics Letters, vol. 32, pp. 3128-3130 (2007).

2. Ritwick Das and K. Thyagarajan, “A High Efficiency Scheme for Phase-Matched Second Harmonic Generation in GaN Based Bragg Reflector Waveguide”, IEEE Photonics Technology Letters, vol. 19, pp. 1526-1528 (2007).

3. Ritwick Das and K. Thyagarajan, “SHG in Bragg reflection waveguides for enhanced bandwidth applications”,Optics Communications, vol. 270, pp. 79-84 (2007).

4. Ritwick Das, and K. Thyagarajan, “Anomalous behaviour in Bragg reflection waveguide”, Optics Communications, vol. 273, pp. 84-88 (2007).

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