Andreas Theodosiou, Ph.D.

Research interests

Fiber optic sensors, mid-IR fiber lasers, fiber lasers, mode-locked lasers, waveguides, demodulation algorithms, signal processing, image processing, interferometers, optical sensing systems, multimode fibers, femtosecond laser inscriptions, fiber Bragg gratings, plasmonic sensing, speckle sensing.

Education

September 2014 – September 2018: PhD in Electrical Engineering, Specialization in Photonics and Optical Sensors from Cyprus University of Technology, “Advanced fibre optic sensors developed with femtosecond laser inscription”

October 2021 – February 2023: Master’s in business administration (MBA) - Neapolis University

October 2011 – September 2013: Master of Science (MSc) in Electrical Engineering - Frederick University, Specialization in Communication systems, “Inscription of Long Period Gratings (LPGs) using a fusion splicer”

October 2007 – June 2011: Bachelor of Science (BSc) in Electrical Engineering - Frederick University, Antennas and Radars, “Design an antenna for hand-held radar for speed recognition”

Awards 

• World’s Top 2% of Scientists in the 2019 - 2022 List of outstanding researchers prepared by Elsevier BV, Stanford University, USA.
• Cyprus Research Award – Distinguished Researcher “Physical Sciences & Engineering” 2021 from the Research & Innovation Foundation (RIF).
• 2020 SPIE Community Champion 
• OFT Best Poster Award 2019 – T. Ma, R. Ishikawa, H. Lee, Antreas Theodosiou, K. Kalli, Y. Mizuno, K. Nakamura, “Twist effect on strain sensitivity of plastic fiber Bragg gratings” – OFT2019-11
• Short Term Scientific Mission in 2018 for visiting Czech Academy of Science for 1 week (COST MP1401), “Thulium-doped fiber laser with FBG inscribed by plane-by-plane, direct-write, femtosecond laser method”
• OFT Best Poster Award 2018 – R. Ishikawa, H. Lee, A. Lacraz, Antreas Theodosiou, K. Kalli, Y. Mizuno, K. Nakamura, “Optical wavelength dependence of strain sensitivity of FBG inscribed in perfluorinated plastic optical fibers” OFT2017-72
• Traveling Grant conference 2018 for participating in Photonics Europe 2018 in Strasbourg (COST MP1401)
• WSOF 2017 Best Poster Award 
• Traveling Grant for technology offer presentation in Dresden (Germany) 2015 (COST MP1401)
• Traveling Grant to Toulouse (France) (COST TD1001)
• Short Term Scientific Mission in 2014 for visiting Aston University in Birmingham (UK) for 3 weeks (COST TD1001). 
• Best Academic Performance on MSc Electrical Engineering Program Frederick University, 2014.
• Finalist IET Present Around The World (PATW) Cyprus section 2016
• Traveling grant for Early-Stage Researchers to Tel-Aviv (COST MP1401)

Selected publications

1. Antreas Theodosiou, "Adaptive Refractive Index Measurements via Polymer Optical Fiber Speckle Pattern Analysis," in IEEE Sensors Journal, vol. 24, no. 1, pp. 287-291, 1 Jan.1, 2024, doi: 10.1109/JSEN.2023.3330740. 
2. O. Henderson-Sapir, N. Bawden, Antreas Theodosiou, M. R. Majewski, K. Kalli, S.D. Jackson, D.J. Ottaway, "Mode-Locked and Tunable 3.5 μm Fiber Laser Using an Acousto-Optic Modulator," Journal of Lightwave Technology, vol. 41, no. 2, pp. 716-725, 2023.
3. Antreas Theodosiou, A. Leal-Junior, C. Marques, A. Frizera, AJS Fernandes, A. Stancalie, A. Ioannou, D. Ighigeanu, R. Mihalcea, C.D. Negut, K. Kalli, “Comparative Study of γ- and e-Radiation-Induced Effects on FBGs Using Different Femtosecond Laser Inscription Methods.”, MDPI Sensors, 21, 8379, 2021
4. Antreas Theodosiou, P. Savva, E. Mendoza, M. Petrou, K. Kalli, “In-Situ relative humidity sensing for ultra-high performance concrete using polymer fiber Bragg gratings”, IEEE Sensors Journal, 2021
5. Antreas Theodosiou, J. Aubrecht, I. Kasik, D. Dousek, M. Komanec, K. Kalli, “Femtosecond laser plane-by-plane inscribed cavity mirrors for monolithic fiber lasers in Thulium-doped fiber”, MDPI Sensors, 2021
6. Antreas Theodosiou, R. Min, A. G. Leal-Junior, A. Ioannou, A. Frizera, M. J. Pontes, C. Marques, and K. Kalli “Long period grating in a multimode cyclic transparent optical polymer fiber inscribed using a femtosecond laser”, Optics Letters, vol. 44, no.21, pp. 5346-5349, 2019. 
7. Antreas Theodosiou, A. Ioannou, K. Kalli, “All-in-fibre cladding interferometric and Bragg grating components made via plane by plane femtosecond laser inscription”, Journal of Lightwave Technology, vol.37, no. 18, 4864-4871, 2019.
8. Antreas Theodosiou, D. Pugliese, E. C. Ginistrelli, N. Boetti, D. Janer, D. Milanese, K. Kalli, “Femtosecond Laser Written Plane-by-Plane Bragg Grating Sensors in Bioresorbable Phosphate Optical Fibres”, Journal of Lightwave Technology, vol 37, no 10, 2363-2369, 2019.
9. Antreas Theodosiou, J. Aubrecht, P. Paterka, I. Kasik, F. Todorov, O. Moravec, P. Honzatko, K. Kalli, “Er/Yb double-clad fibre laser with fs-laser inscribed plane-by-plane chirped FBG laser mirrors”, IEEE Photonics Technology Letters, vol. 31, no. 5, 409-412, 2019.
10. Antreas Theodosiou, K. Kalli, M. Fokine, T. Hawkins, J. Ballato, U. J. Gibson “Characterisation of Silicon fibre Bragg grating in near-infrared band for strain and temperature sensing”, Electronics Letters, vol.54, no. 24, 1393-1395, 2018.