Dr. Charalampos Zervos Profile

Dr. Charalampos Zervos

at National Technical Univ of Athens

SPIE Involvement:

Author

Publications (15)

Proceedings Article | 10 June 2024 Poster + Paper

Flat emission grating couplers design enabling optical antennas for high performance LIDAR systems

Thenia Prousalidi, Giannis Poulopoulos, Evrydiki Kyriazi, Georgios Syriopoulos, Peter Maat, Roel Botter, Charalampos Zervos, Dimitrios Apostolopoulos, Hercules Avramopoulos

Proceedings Volume 12991, 1299118 (2024) https://doi.org/10.1117/12.3021971

KEYWORDS: Design, Simulations, LIDAR, Waveguides, Antennas, Optical design, Phased array optics, Optical antennas, Beam steering

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Proceedings Article | 12 March 2024 Poster + Paper

A novel photonic integrated optical divider based on cascaded multimode interference (MMI) couplers achieving a splitting ratio of 1:10e-9

L. Gounaridis, J. Gran, E. Katsaouni, C. Zervos, A. Raptakis, E. Kyriazi, G. Brestas, A. M. Grammatikaki, D. Geuzebroek, H. Avramopoulos, C. Kouloumentas

Proceedings Volume 12889, 128890Z (2024) https://doi.org/10.1117/12.3002772

KEYWORDS: Photonic integrated circuits, Waveguides, Design, Integrated optics, Tolerancing, Wave propagation, Sensors, Quantum measurement, Calibration, Multimode interference devices

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Proceedings Article | 12 March 2024 Poster + Paper

Integrated silicon Bragg-grating-based temperature sensor embedded in composite molds for out-of-autoclave composite parts process monitoring and optimisation

Charalampos Zervos, Georgios Syriopoulos, Evrydiki Kyriazi, Michal Szaj, Aggelos Poulimenos, Jeroen Missinne, Giannis Poulopoulos, Geert Van Steenberge, Hercules Avramopoulos

Proceedings Volume 12889, 128890T (2024) https://doi.org/10.1117/12.3001491

KEYWORDS: Sensors, Photonic integrated circuits, Composites, Temperature sensors, Bragg gratings, Photonics, Composite resins, Silicon, Design

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Proceedings Article | 11 March 2024 Poster + Paper

Photonic sensor-based machine learning for precise forecasting of cure time and temperature overshoot in resin transfer moulding

Evrydiki Kyriazi, Georgios Petsinis, Charalampos Zervos, Giannis Poulopoulos, Georgios Syriopoulos, Geoffrey Neale, Mehdi Asareh, Alexandros Skordos, Hercules Avramopoulos

Proceedings Volume 12893, 1289318 (2024) https://doi.org/10.1117/12.3001532

KEYWORDS: Data modeling, Machine learning, Composites, Manufacturing, Sensors, Photodetectors, Optical sensors, Composite resins, Education and training, Aerospace engineering

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Proceedings Article | 8 March 2024 Poster + Paper

Integrated broadband bent directional coupler for use in telescope interferometry in the visible (600 nm – 820 nm)

Giannis Poulopoulos, Georgios Syriopoulos, Evrydiki Kyriazi, Thenia Prousalidi, Dimitris Apostolopoulos, Xavier Haubois, Charalampos Zervos, Hercules Avramopoulos

Proceedings Volume 12882, 128820T (2024) https://doi.org/10.1117/12.3001472

KEYWORDS: Waveguides, Directional couplers, Telescopes, Wave propagation, Interferometry, Design, Silicon nitride, Electric fields, Astronomical telescopes, Astronomical interferometry

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SPIE Journal Paper | 2 December 2023 Open Access

Silicon photonic temperature sensor: from photonic integrated chip to fully packaged miniature probe

Jeroen Missinne, Viktor Geudens, Giannis Poulopoulos, Michal Szaj, George Syriopoulos, Charalampos Zervos, Evridiki Kyriazi, Hercules Avramopoulos, Geert Van Steenberge

JOM, Vol. 4, Issue 01, 011005, (December 2023) https://doi.org/10.1117/12.10.1117/1.JOM.4.1.011005

KEYWORDS: Photonic integrated circuits, Sensors, Interfaces, Reflection, Bragg gratings, Bragg wavelengths, Temperature sensors, Optical gratings, Silicon photonics, Photodetectors

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Proceedings Article | 17 March 2023 Poster + Paper

Demonstration of photonic temperature sensor for RTM-6 composite manufacturing process (180°C) integrated with PMOC system

Georgios Syriopoulos, Aggelos Poulimenos, Giannis Poulopoulos, Maria Poulimenou, Jeroen Missinne, Michal Szaj, Charalampos Zervos, Geert Van Steenberge, Hercules Avramopoulos

Proceedings Volume 12424, 1242416 (2023) https://doi.org/10.1117/12.2649992

KEYWORDS: Sensors, Control systems, Reflection, Polarization, Temperature sensors, Process control, Bragg gratings, Thermal optics, Silicon, Photodetectors

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Proceedings Article | 13 March 2023 Presentation + Paper

A fully packaged silicon photonic Bragg grating temperature sensor with a compact back side interface based on a ball lens

Jeroen Missinne, Viktor Geudens, Steven Van Put, Giannis Poulopoulos, Michal Szaj, George Syriopoulos, Charalampos Zervos, Hercules Avramopoulos, Geert Van Steenberge

Proceedings Volume 12426, 124260F (2023) https://doi.org/10.1117/12.2647381

KEYWORDS: Photonic integrated circuits, Sensors, Interfaces, Bragg gratings, Reflection, Temperature sensors, Silicon photonics, Silica, Semiconducting wafers, Optical gratings

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Proceedings Article | 17 May 2022 Presentation + Paper

Silicon photonics temperature and refractive index sensor for curing process monitoring in composite material industry

Ioannis Poulopoulos, Charalampos Zervos, Georgios Syriopoulos, Jeroen Missinne, Michal Szaj, Hercules Avramopoulos

Proceedings Volume 12139, 1213909 (2022) https://doi.org/10.1117/12.2621285

KEYWORDS: Bragg gratings, Sensors, Polarization, Refractive index, Composites, Photonics, Temperature sensors, Silicon, Thermal optics, Coating

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Composite materials offer significant performance advantages due to their lightweight, high-strength, and high stiffness. This led to their adoption in several industrial sectors with particular emphasis on the aerospace industry which has undergone a transformation towards a composite-dominated new standard. In order to respond to the increased demand, it is mandatory to focus on an efficient and well-controlled curing cycle of the resin, which will lead to a significant reduction of cost and an increase in production speed. We investigate, a photonic solution, able of measure key monitoring values that facilitate optimization of the curing process. Simulation and evaluation results on a bragg grating based photonic integrated sensor, developed in 220 nm Silicon-onInsulator platform, are presented. A multi-sensor deployment is considered, enabling monitoring of the temperature and the refractive index of the resin. Serially coupled bragg grating photonic elements will enable concurrent monitoring of both temperature and refractive index. Several bragg configurations have been investigated and experimentally evaluated, specifically regular and phase-shifted ones. Both TE and TM polarization operation sensors that have been designed and fabricated, will be presented. Their sensitivity on resin temperature and refractive index variation will be discussed, resulting in a comparative study outlining the benefits and disadvantages of each solution. Refractive index sensors are realized by employing post-processing etching techniques on Multi-Project-Wafer run fabricated silicon chips, on top of the periodic bragg grating element. The comparative study takes into consideration TE and TM polarization operation, regular and phase-shifted bragg grating configuration elements, while evaluating their sensitivity in temperature and refractive index variations. Temperatures considered are in the range of 27°C to 200°C, while refractive index values lay between 1.5 and 1.6. A Figure-of-Merit is proposed to facilitate the selection of multi-sensor deployment for specific temperature and refractive index ranges.

Proceedings Article | 5 March 2022 Presentation + Paper

Miniaturized silicon photonics multi-sensor operating at high temperatures for use in composite materials industrial applications

Charalampos Zervos, Giannis Poulopoulos, Jeroen Missinne, Michal Szaj, Hercules Avramopoulos

Proceedings Volume 12008, 120080P (2022) https://doi.org/10.1117/12.2606053

KEYWORDS: Sensors, Composites, Bragg gratings, Photonics, Photonic integrated circuits, Temperature sensors

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Proceedings Article | 4 March 2019 Presentation + Paper

A new generation of high-speed electro-optical transceivers and flexible bandwidth wavelength selective switches for coherent DCI: the QAMeleon project approach

C. Zervos, M. Spyropoulou, I. Kanakis, I. Lazarou, K.-O. Velthaus, E. Rouvalis, G. Torfs, E. Goobar, R. Santos, N. Tessema, T. Lamprecht, T. Johansen, R. Hersent, H. Mardoyan, S. Dris, T. Alexoudi, P. Giardina, D. Roccato, G. Vickers, H. Avramopoulos

Proceedings Volume 10924, 109240E (2019) https://doi.org/10.1117/12.2509454

KEYWORDS: Waveguides, Digital signal processing, Polarization, Photonic integrated circuits, Photonics, Liquid crystal on silicon, Polymers, Switches, Transceivers, Modulation

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Proceedings Article | 20 February 2015 Paper

Front end for high-repetition rate thin disk-pumped OPCPA beamline at ELI-beamlines

Jonathan Green, Jakub Novák, Roman Antipenkov, František Batysta, Charalampos Zervos, Jack Naylon, Tomáš Mazanec, Martin Horáček, Pavel Bakule, Bedřich Rus

Proceedings Volume 9342, 93420T (2015) https://doi.org/10.1117/12.2077491

KEYWORDS: Amplifiers, Picosecond phenomena, Disk lasers, Crystals, Mirrors, Oscillators, Pulsed laser operation, Second-harmonic generation, Head, High power lasers

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Proceedings Article | 28 February 2014 Paper

Jitter-compensated Yb:YAG thin-disc laser as a pump for the broadband OPCPA front-end of the ELI-Beamlines system

Roman Antipenkov, Jonathan Green, František Batysta, Jack Naylon, Charalampos Zervos, Jakub Novak, Pavel Bakule, Bedrich Rus

Proceedings Volume 8959, 895917 (2014) https://doi.org/10.1117/12.2039751

KEYWORDS: Optical amplifiers, Picosecond phenomena, Mirrors, Crystals, Laser stabilization, Pulsed laser operation, Amplifiers, Oscillators, Polarization, Second-harmonic generation

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Proceedings Article | 7 May 2013 Paper

ELI-Beamlines laser systems: status and design options

B. Rus, P. Bakule, D. Kramer, G. Korn, J. Green, J. Nóvak, M. Fibrich, F. Batysta, J. Thoma, J. Naylon, T. Mazanec, M. Vítek, R. Barros, E. Koutris, J. Hřebíček, J. Polan, R. Baše, P. Homer, M. Košelja, T. Havlíček, A. Honsa, M. Novák, C. Zervos, P. Korous, M. Laub, J. Houžvička

Proceedings Volume 8780, 87801T (2013) https://doi.org/10.1117/12.2021264

KEYWORDS: Optical amplifiers, Amplifiers, Oscillators, Laser applications, Laser systems engineering, Pulsed laser operation, Crystals, Laser development, Picosecond phenomena, Laser crystals

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Proceedings Article | 7 May 2013 Paper

Design of kW level picosecond compressor of pump pulses for high power OPCPA

Pavel Bakule, Jakub Novák, Daniel Kramer, Petr Strkula, Miroslav Novák, Jan Hřebíček, Efstratios Koutris, Charalampos Zervos, Radek Baše, František Batysta, Zbyněk Hubka, Jonathan Green, Bedřich Rus

Proceedings Volume 8780, 87801V (2013) https://doi.org/10.1117/12.2021552

KEYWORDS: Picosecond phenomena, Crystals, Nonlinear crystals, Second-harmonic generation, Mirrors, Optical amplifiers, Amplifiers, Fiber amplifiers, Diffraction gratings, Absorption

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Showing 5 of 15 publications

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