Areas of Interest
✔ Experimental soft matter physics
✔ high resolution imaging and optical tweezers
Current Research
We are an upcoming group in the Physics department of IIT Madras with primary emphasis on Optical Tweezers based study of statistical mechanics and biological systems. We are essentially going to divide our time for two topics, namely, High Resolution Imaging based systems and Optical Tweezers based systems. We would like to couple high resolution imaging systems to optical tweezers to study biological systems. Optical Tweezers are a tightly focused beam of light which generates a three dimensional potential well for trapping microparticles. These can not only be used to apply and detect controlled forces but also controlled torques upon using birefringent microparticles. We would like to couple single cells to the optical tweezers, to probe both inside the cell and on the membrane. We would also like to enhance optical tweezers intrumentation to sense forces on cells passively without actually applying a force directly.
Students
Current PhD Students
✔ PH19D204 SNIGDHADEV CHAKRABORTY
✔ PH20D089 JAYESH GOSWAMI
✔ PH20D204 ATANU GHOSH (CO-GUIDANCE)
✔ PH24D051 MRUTYUNJAYA RATH
✔ PH24D063 AGNIVA DAS
Recent Publications
- ✔ Controlled roll rotation of a microparticle in a hydro-thermophoretic trap. Gokul Nalupurackal, Kingshuk Panja, Snigdhadev Chakraborty, Srestha Roy, Jayesh Goswami, Basudev Roy*, Rajesh Singh*. Physical Review Research. 5. 033005. 2023.
- ✔ Facets of optically and magnetically induced heating in ferromagnetically doped-NaYF$_4$ particles. Snigdhadev Chakraborty, Gokul Nalupurackal, Gunaseelan M., Srestha Roy, Muruga Lokesh, Jayesh Goswami, Priyankan Datta, Pallab Sinha Mahapatra, Basudev Roy. Journal of Physics Communications. 7. 065008. 2023.
- ✔ Towards Stirling engine using an optically confined particle subjected to asymmetric temperature profile. Gokul Nalupurackal, Muruga Lokesh, Sarangi Suresh, Srestha Roy, Snigdhadev Chakraborty, Jayesh Goswami, Gunaseelan M., Arnab Pal, Basudev Roy. New Journal of Physics. 25. 063001. 2023.
- ✔ Comparison of thermal and athermal dynamics of the cell membrane slope fluctuations in the presence and absence of Latrunculin-B. Srestha Roy, Rahul Vaippully, Muruga Lokesh, Gokul Nalupurackal, Vandana Yadav, Snigdhadev Chakraborty, Manoj Gopalakrishnan, Privita Edwina, Saumendra Bajpai, Basudev Roy. Physical Biology. 2023.
- ✔ Simultaneous optical trapping and electromagnetic micromanipulation of ferromagnetic doped-NaYF4 microparticles. Gokul Nalupurackal, M. Gunaseelan, Muruga Lokesh, Rahul Vaippully, Amit Chauhan, B.R.K. Nanda, Sudakar Chandran, Hema Chandra Kotamarthi, Priyankan Datta, Pallab Sinha Mahapatra, Anita Jannasch, Erik Schaffer, Jayaraman Senthilselvan, Basudev Roy. ACS Applied Optical Materials. 2023.
- ✔ Breaking the diffraction limit in absorption spectroscopy using upconverting nanoparticles. Kumar, Sumeet; Gunaseelan, M.; Vaippully, Rahul; Banerjee, Ayan; Roy, Basudev. Nanoscale. 2021.
- ✔ Continuous rotational motion in birefringent particles using two near-orthogonally polarized optical tweezers beams at different wavelengths with low ellipticity. Rahul Vaippully, Muruga Lokesh and Basudev Roy. Journal of Optics. 23. 094001. 2021.
- ✔ Estimation of motional parameters using emission from upconverting nanoparticles optically trapped at the absorption resonance. Kumar, Amrendra; Gunaseelan, M.; Vaidya, Gaurav; Vaippully, Rahul; Roy, Basudev. European Physical Journal Special Topics. 2021.
- ✔ Calcium-channel blockers exhibit divergent regulation of cancer extravasation through the mechanical properties of cancer cells and underlying vascular endothelial cells. Vaibavi Ramanujam, Manoj S., Rahul Vaippully, Privita Edwina, Basudev Roy and Saumendra Bajpai. Cell Biophysics and Biochemistry. 2021.
- ✔ Estimation of rolling work of adhesion at the nanoscale with soft probing using optical tweezers. Muruga Lokesh, Rahul Vaippully, Gokul N, Srestha Roy, Vidya P. Bhallamudi, Anil Prabhakar and Basudev Roy. RSC Advances. 11. 34636. 2021.
Teaching
✔ 2017 : (Jul-Nov) - EP2100-Introduction to Engineering Optics
✔ 2018 : (Jan-May) - PH1020 Physics II; (Jul - Nov) - PH1010 Physics I
✔ 2019 : (Jan-May) - PH2070 Introduction to Biological Physics; (Jul - Nov) - EP2100 Introduction to Engineering Optics/ PH5060 Physics Lab I (PG)
✔ 2020 : (Jan-May) - EP3291 Engineering Physics Lab IV/ PH2070 Introduction to Biological Physics; (Jul - Nov) - EP2100 Introduction to Engineering Optics/ PH5060 Physics Lab I (PG)
✔ 2021 : (Jan-May) - PH1020 Physics II; (Jul - Nov) - PH1010 Physics I
✔ 2022 : (Jan-May) - PH1030 Physics Laboratory I / PH2070 Introduction to Biological Physics ; (Jul - Nov) - PH1010 Physics I
✔ 2023 : (Jan-May) - PH1030 Physics Laboratory I / PH2080 Physics Lab IV ; (Jul - Nov) - PH6022 Introduction to Nanoscience
✔ 2024 : (Jan-May) - PH1020 Physics II ; (Jul - Nov) - PH3110 Electromagnetics and Applications
✔ 2025 : (Jan-May) - PH2070 Introduction to Biological physics