Dr Sai Kiran Rajendran
Research Fellow
Research areas
I am a research fellow at the Quantum Light-Matter group, School of Physics and Astronomy, University of St Andrews, working on the Leverhulme project ‘Perovskite dipolaritons for room temperature quantum applications’ since January 2023 with Dr Hamid Ohadi. In 2022, I worked at the Institute of Photonics, University of Strathclyde on the EPSRC QuantIC project ‘Quantum enhanced multiphoton absorption for imaging’ with Dr Lucia Caspani. I worked on EPSRC Project Rydberg Polaritons in Cu2O microcavities (EP/S014403/1) from November 2019 to December 2021 with Dr. Hamid Ohadi at the Quantum Light-Matter group. I was also a principal investigator to the Research Incentive Grant (RIG009823), from the Carnegie Trust for the Universities of Scotland, working on quantum confined Rydberg excitons of cuprous oxide in 2020-21. During the earlier period from November 2015 to 2019, I worked on the EPSRC project Hybrid Polaritonics (EP/M025330/1) with Prof. Ifor Samuel and Prof. Graham Turnbull at the Organic Semiconductor Centre. In 2015, I worked at the Ultrafast spectroscopy group with Dr. Tersilla Virgili and Prof. Giulio Cerulllo at Politecnico di Milano. Earlier I graduated in 2009 with Masters in Physics from Sri Sathya Sai Institute of Higher Learning, Anantapur, India. I then joined as an early stage researcher at the Dipartimento di Fisica, Politecnico di Milano, Milan, Italy as part of the Marie Curie ITN-FP7-PEOPLE Project ICARUS (237900) and obtained a Ph.D. degree in 2014.
My current interests involve fabrication and engineering semiconductor materials towards understanding their properties using a wide range of spectroscopic studies for applications in optoelectronics and quantum technologies. Materials of interest are inorganic semiconductors, perovskites, carbon nanotubes, plasmonic nanoparticles, liquid crystals, and a wide range of organic semiconductor materials. Fabrication techniques of interest are thermal evaporation, RF magnetron sputtering, spin coating, chemical vapour deposition and focused ion beam etching. Spectroscopy techniques of interest are ellipsometry, Raman spectroscopy, scanning electron microscopy, photoluminescence and amplified spontaneous emission, time-correlated single photon counting, streak camera, X-ray diffraction, Fourier imaging spectroscopy, interferometry, cryogenic spectroscopy, femtosecond transient absorption and 2D electronic spectroscopy.
Selected publications
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Nonlinear Rydberg exciton-polaritons in Cu 2O microcavities
Makhonin, M., Delphan, A., Song, K. W., Walker, P., Isoniemi, T., Claronino, P., Orfanakis, K., Rajendran, S. K., Ohadi, H., Heckötter, J., Assmann, M., Bayer, M., Tartakovskii, A., Skolnick, M., Kyriienko, O. & Krizhanovskii, D., 6 Feb 2024, In: Light: Science & Applications. 13, 1, p. 47Research output: Contribution to journal › Article › peer-review
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Open access
Local tuning of Rydberg exciton energies in nanofabricated Cu2O pillars
Paul, A. S., Rajendran, S. K., Ziemkiewicz, D., Volz, T. & Ohadi, H., 28 Mar 2024, In: Communications Materials. 5, 43, 8 p., 43.Research output: Contribution to journal › Article › peer-review
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Open access
Nonlinear Rydberg exciton-polaritons in Cu2O microcavities
Makhonin, M., Delphan, A., Song, K. W., Walker, P., Isoniemi, T., Claronino, P., Orfanakis, K., Rajendran, S. K., Ohadi, H., Heckötter, J., Assmann, M., Bayer, M., Tartakovskii, A., Skolnick, M., Kyriienko, O. & Krizhanovskii, D., 6 Feb 2024, In: Light: Science & Applications. 13, 1, 9 p., 47.Research output: Contribution to journal › Article › peer-review
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Open access
Rydberg exciton-polaritons in a Cu2O microcavity
Orfanakis, K., Rajendran, S. K., Walther, V., Volz, T., Pohl, T. & Ohadi, H., Jul 2022, In: Nature Materials. 21, 7, p. 767–772Research output: Contribution to journal › Article › peer-review
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Open access
Quantum confined Rydberg excitons in Cu2O nanoparticles
Orfanakis, K., Rajendran, S. K., Ohadi, H., Zielińska-Raczyńska, S., Czajkowski, G., Karpiński, K. & Ziemkiewicz, D., 21 Jun 2021, In: Physical Review. B, Condensed matter and materials physics. 103, 24, 6 p., 245426 .Research output: Contribution to journal › Article › peer-review
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Open access
Room temperature polariton lasing in ladder-type oligo(p-phenylene)s with different π-conjugation lengths
Wei, M., Fang, M., Rajendran, S. K., Lai, W.-Y., Turnbull, G. A. & Samuel, I. D. W., 7 Jan 2021, In: Advanced Photonics Research. 2, 1, 7 p., 2000044.Research output: Contribution to journal › Article › peer-review
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Open access
Pick and place distributed feedback lasers using organic single crystals
Ma, S., Wei, M., Rajendran, S. K., Karl, M., Xu, B., Gather, M. C., Tian, W., Turnbull, G. A. & Samuel, I. D. W., 17 Apr 2020, In: Advanced Optical Materials. 8, 8, 6 p., 1901785.Research output: Contribution to journal › Article › peer-review
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The reduction of oscillator strength in nanoscale reveals the fragility of high-n Rydberg excitons in Cu2O
Orfanakis, K., Rajendran, S. K. & Ohadi, H., 24 Nov 2020, In: ArXiv e-prints. 8 p.Research output: Contribution to journal › Article
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Open access
A hybrid organic-inorganic polariton LED
Jayaprakash, R., Georgiou, K., Coulthard, H., Askitopoulos, A., Rajendran, S. K., Coles, D., Musser, A., Clark, J., Samuel, I. D. W., Turnbull, G. A., Lagoudakis, P. & Lidzey, D., 4 Sept 2019, In: Light: Science & Applications. 8, 11 p., 81.Research output: Contribution to journal › Article › peer-review
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Open access
Correlating phase behavior with photophysical properties in mixed-cation mixed-halide perovskite thin films
Greenland, C., Shnier, A., Rajendran, S. K., Smith, J. A., Game, O. S., Wamwangi, D., Turnbull, G. A., Samuel, I. D. W., Billing, D. G. & Lidzey, D. G., 16 Dec 2019, (E-pub ahead of print) In: Advanced Energy Materials. Early View, 1901350.Research output: Contribution to journal › Article › peer-review