Avulu Vinod Kumar
Postdoctoral Research Fellow
Latest Results!!!
Integrating FIB-milled disk resonators with flexible waveguides
A Tandem Approach to Fabricate a Hybrid, Organic-Add-Drop Filter Using Focused Ion Beam Milling-assistred Single-Crystal Disk-Resonators and Atomic Force microscopy-driven Pseudo-Plastic Crystal Waveguides.
Laser Photonics & Rev. 2024, 17, 2300552
Shaping of 1D organic crystal into 2D/3D waveguide
Light-assisted shaping of 1D organic crystals waveguide into 2D or 3D waveguide on a substrate or free space, respectively. The photoisomerization-induced crystalline to amorphous phase transformation allows laser-assisted mechanical bending of organic crystal on a 2D plane or 3D free space to demonstrate first-unnatural 2D/3D waveguides.
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Angew. Chem., Int. Ed. 2023, 00, 202302929
Underwater waveguide sensor
Amphibian-like, mechanically flexible hydrophobic organic crystalline optical fibres are potential candidates as air/underwater compatible optical signal transducers and high-precision underwater microparticle sensors. We demonstrate micro-particle sensing by exploiting the dual active/passive waveguiding in an organic crystal waveguide.
Angew. Chem., Int. Ed. 2023, 00, 202300046
Hybrid Directional Coupler
Hybrid directional couplers are important photonic circuit components as they enable multi-tasking capabilities with single optical components!!!
They act as signal and chromaticity modulators with the same circuit geometry depending on the port receiving the input light.
J. Mater. Chem. C 2023,
Publications
2025 § Equal contribution of authors *Corresponding author
30. Resonator-based add-drop filters enabled by flexible polymorphic crystals with TADF-RTP motifs
Pradip Pattanayak, Ankur Khapre, Shamim Ahmad, Avulu Vinod Kumar, Bishes Ray, Satendra Kumar, Chilla Malla Reddy,* Rajadurai Chandrasekar,* and Pradipta Purkayastha*
Chem. Sci. 2026, 00, 25008545 (accepted)
29. Hierarchical Serpentine-like Organic Crystal Optical Waveguides for Artificial Neural Networks
Avulu Vinod Kumar,§ Mehdi Rohullah,§ Melchi Chosenyah,§ Gaddam Sindhuja and Rajadurai Chandrasekar*
Angew. Chem. Int. Ed. 2025, 64, e202502122.
28. Cornu-Spiral-like Waveguide Providing Discriminatory Optical Pathway for Smart Organic Photonic Circuit
Mehdi Rohullah, Melchi Chosenyah, Avulu Vinod Kumar,* and Rajadurai Chandrasekar*
Small 2024, 21, 2407498.
2024
27. A Chameleon-like Core-Shell Organic/Lanthanide Hybrid Crystal Waveguide for Dynamic Bandwidth and Colour Tunability
Melchi Chosenyah, Mehdi Rohullah, Avulu Vinod Kumar, K. V. Jovan Jose* and Rajadurai Chandrasekar*
Chem. Sci. (under revision)
26. Capturing the Interplay Between TADF and RTP through Mechanically Flexible Polymorphic Optical Waveguides
A. Vinod Kumar,§ Pradip Pattanayak,§ Ankur Khapre, Arnab Nandi, Pradipta Purkayastha* and Rajadurai Chandrasekar*
Angew. Chem. Int. Ed. 2024, 63, e202411054.
25. Powering Organic Flexible Optical Waveguides and Circuits via Focused Micro-LEDs for Visible Light Communication
A. Vinod Kumar,§ Ankur Khapre,§ R. Chandrasekar*
Laser Photonics Rev. 2024, 2400278.
https://arxiv.org/abs/2402.18889
24. An Extremely Pseudo-Plastic, Organic Crystal-Based Concentric-Ring-Resonator Coupled Optical Waveguide
A. Vinod Kumar, Deepak Manoharan, Ankur Khapre, Soumyajith Ghosh,* R. Chandrasekar*
Adv. Phys. Res. 2024, 2400075.
23. Mechanophotonics: Pseudo-Plastic Organic Crystal as a Fermat Spiral Optical Waveguide.
M. Chosenyah, A. Vinod Kumar, R. Chandrasekar*
IEEE Photon. Technol. Lett. 2024, 36, 1093.
22. A Hybrid Organic-Crystal-based Curved Waveguide Network for Producing, Splitting, and Transducing Multi-Color Outputs.
M. Rohullah,§ A. Vinod Kumar,§ R. Chandrasekar*
Laser Photonics Rev. 2024, 2400020.
21. Spatially Controllable and Mechanically Switchable Isomorphous Organoferroeleastic Crystal Optical Waveguides and Networks.
S. Ranjan,§ A. Vinod Kumar,§ R. Chandrasekar,* S. Takamizawa*
Nat. Commun. 2024, 24-02118.
20. A Pick-and-Place Technology Enabled, Mechanically Programmable, Spiral Optical Waveguides Integrated Hybrid Circuits from Four Extremely Pseudo-Plastic Organic Crystals.
A. Vinod Kumar, M. Godumala, J. Ravi, R. Chandrasekar*
Adv. Opt. Mater. 2024, 10.1002/adom.202302807
2023
19. Highly-strained, Pseudo-plastic, Cu-pyridyl Coordination Polymer Crystal based Optical Waveguide-Cavity.
P. Shiva, A. Khapre, M. Chosenyah, A. Vinod Kumar,* R. Chandrasekar*
Chem. Mater. 2023, 35, 2302369.
18. A Tandem Approach to Fabricate a Hybrid, Organic-Add-Drop Filter Using Single-Crystal Disk-Resonators and Pseudo-Plastic Crystal Waveguides.
V. V. Pradeep,§ A. Vinod Kumar,§ R. Chandrasekar*
Laser Photonics Rev. 2023, 2300552.
17. Dimension Engineering of Light-Stimuli-Responsive 1D Molecular Crystals into Unusual 2D and 3D Zigzag Waveguides.
M. Annadhasan,§ A. Vinod Kumar,§ P. Giri, S. Nandy, M. K. Panda, K. V. Jovan Jose,* R. Chandrasekar*
Angew. Chem. Int. Ed. 2023, 62, e202302929.
16. Amphibian-like Flexible Organic Crystal Optical Fibres for Underwater/Air Micro-Precision Lighting and Sensing.
A. Vinod Kumar,§ M. Rohullah,§ M. Chosenyah, J. Ravi, U. Venkataramudu, R. Chandrasekar*
Angew. Chem. Int. Ed. 2023, 62, e202300046.
15. Mechanophotonics: Fabrication of a 2×2 Hybrid Directional Coupler from Flexible Organic Crystals.
A. Vinod Kumar, R. Chandrasekar*
J. Mater. Chem. C 2023, 11, 7995-8001.
2022
14. A Broadband, Multiplexed-Visible-Light-Transport in Composite Flexible-Organic-Crystal Waveguide.
A. Vinod Kumar, Mallesham Godumala, Jada Ravi, Rajadurai Chandrasekar*
Angew. Chem. Int. Ed. 2022, 61, e2212382.
13. Race-Track type Resonator Integrated Active Add-Drop Filter from Flexible Organic Crystals: Experiments and Numerical Calculations.
A. Vinod Kumar, Evgeniy Mamonov, Tatiana Murzina,* Rajadurai Chandrasekar*
Adv. Opt. Mater. 2023, 11, 202201507.
12. A Mechanophotonic Approach towards an Organic, Flexible Crystals Optical Interferometer.
A. Vinod Kumar, R. Chandrasekar*
Adv. Opt. Mater. 2023, 11, 202201009.
11. Micromechanically-Powered Rolling Locomotion of Twisted-Crystal Waveguide-Cavity as a Mobile Light Polarization Rotor.
M. Rohullah, V. Vinay Pradeep, J. Ravi, A. Vinod Kumar, R. Chandrasekar*
Angew. Chem. Int. Ed. 2022, 61, e202202114.
10. Realization of Mechanically Maneuverable Circuit Ports in Organic Hybrid Photonic Chip for 360° Steering of Bandwidth Engineered Signals.
J. Ravi, A. Vinod Kumar, M. Annadhasan, R. Chandrasekar*
Adv. Opt. Mater. 2022, 10, 2102545.
2021
9. Integrating Triply- and Singly-Bent Highly Flexible Crystal Optical Waveguides for Organic Photonic Circuit with a Long-Pass-Filter Effect.
M. Annadhasan, V. Vinay Pradeep, A. Vinod Kumar, J. Ravi, R. Chandrasekar*
Small Struct. 2021, 3, 2100163.
8. Room Temperature Phosphorescent Organic Materials for Optical Waveguides.
A. Vinod Kumar§, M. Godumala§, R. Chandrasekar*
J. Mater. Chem. C 2021, 9, 14115-14132.
7. Geometrically-Reconfigurable, Two-Dimensional, All-Organic Photonic Integrated Circuits Made from Two Mechanically and Optically Dissimilar Crystals.
J. Ravi, A. Vinod Kumar, D. P. Karothu, M. Annadhasan, P. Naumov, R. Chandrasekar*
Adv. Funct. Mater. 2021, 31, 2105415.
6. Mechanophotonic Aspects of a Room Temperature Phosphorescent Flexible Organic Microcrystal.
A. Vinod Kumar, M. Rohullah, J. Ravi, M. Godumala, M. Annadhasan, R. Chandrasekar*
Crys. Engg. Comm. 2021, 23, 5774 - 5779.
5. Mechanically Reconfigurable Organic Photonic Integrated Circuits Made of Electronically Different Flexible Microcrystals.
J. Ravi, M. Annadhasan, A. Vinod Kumar, R. Chandrasekar*
Adv. Funct. Mater. 2021, 31, 2100642.
4. Spatio-Temporal Growth Anomalies in Photo-Isomerisable Cyanostilbene-Based Crystals Triggered by Light.
A. Vinod Kumar§, M. Annadhasan§, V. V. Pradeep, M. Jyothi, K. V. J. Jose,* R. Chandrasekar*
J. Phys. Chem. C 2021, 125, 4909-4916.
3. Magnetic Field-Assisted Manipulation of Polymer Optical Microcavities.
M. Annadhasan, A. Vinod Kumar, J. Ravi, E. A. Mamonov, T. Murzina,* R. Chandrasekar*
Adv. Photonics Res. 2021, 2, 2000146.
2. Mechanical Processing of Naturally Bent Organic Crystalline Microoptical Waveguides and Junctions.
V. V. Pradeep, C. Tardío, I. T. -Moya, A. Vinod Kumar, M. Annadhasan, A. de la Hoz, P. Prieto,* R. Chandrasekar*
Small 2021, 17, 2006795.
2020
1. Mechanophotonics: Precise-Selection, Assembly and Disassembly of Polymer Optical Microcavities for Spectral Engineering.
M. Annadhasan, A. Vinod Kumar, D. Venkatakrishnarao, E. A. Mamonov, R. Chandrasekar*
Nanoscale Adv. 2020, 2, 5584-5590.