Projects

Fabrication of fiber Bragg Gratings using femtosecond UV laser pulses
Research Area: Fiber Bragg Gratings
Project leaders: Othonos, Andreas
Members: Papatryfonos, Constantinos
Funding: Research Promotion Foundation
Budget: EUR 394.000,-
Fabrication of fiber Bragg Gratings using femtosecond UV laser pulses

The discovery of fibre optics has revolutionized the field of sensors and telecommunications. Over the past three decades, the advancements in optical fibre has undoubtedly improved and reshaped fibre optic technology. Today optical fibres plus related components are synonymous with the word “telecommunication” and “optical sensors”. Despite the improvements in optical fibre manufacturing and advancements in the field in general, basic optical components such as mirrors, wavelength filters, and partial reflectors have been a challenge to integrate with fibre optics. Recently, however, all this has changed with the ability to alter the core index of refraction in a single mode optical fibre by optical absorption of UV light. The photosensitivity of optical fibres allows the fabrication of phase structures directly into the fibre core, called fibre Bragg gratings. The fibre Bragg grating can perform many primary functions, such as reflection and filtering, in a highly efficient, low loss manner. This versatility has stimulated a number of significant innovations. This project aims in the development of the fiber Bragg Grating Facility through the upgrade of several key ultrafast laser systems and optical components at the already established Research Center of Ultrafast Science.

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Research Center of Ultrafast Science
Research Area: Ultrafast Spectroscopy
Project leaders: Othonos, Andreas
Members: Emporas, Alexandros
Tsangaris, Haralambos
Loumakos, Loukas
Tsokkou, Demetra
Lioudakis, Emmanouil
Funding: Research Promotion Foundation
Budget: EUR 470.000,-
Research Center of Ultrafast Science

With the implementation of this research proposal the University of Cyprus and in particular the Department of Physics has developed a modern research laboratory in ultrafast science having a state of the art research equipment and as a result having research collaborations with Research Center and Universities worldwide. The infrastructure research project provided the funding for purchasing and installing an ultrafast laser amplifier which is able to generate 45 fs pulses with center wavelength at 800 nm and energy of 0.5 mJ at a repetition rate of 5kHz. The ultrafast amplifier system consisted of an Optical Parametric Amplifier for the generation of a particular laser wavelength using non-linear crystals. The Research Center of Ultrafast Science makes use of pump-probe techniques for the characterization and study of the optical properties of various novel material with temporal resolution of femtoseconds. These time scales have allowed the detail study of material such as semiconductors and polymers giving an important input to the technology of the future.

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Terahertz Ultrafast Pulse Shaping
Research Area: Ultrafast Spectroscopy
Project leaders: Othonos, Andreas
Members: Tsokkou, Demetra
Georgiou, George
Funding: Levendis Research Program
University of Cyprus
Budget: EUR 164.330,-
Terahertz Ultrafast Pulse Shaping

We propose to design and develop a femtosecond pulse shaper system for generating ultrafast terahertz pulses that will be used for time resolved experiments in semiconductors. The project will be carried out in three phases. In the first phase of the project, a programmable control liquid crystal system pulse shaper will be developed. This will allow control of amplitude and phase of the outgoing ultrafast laser pulse. In the second phase of the project we will use the pulse shaper apparatus to develop and study terahertz generation based on photoconductive switches. The objective here is to develop and control THz radiation with the best efficiency and highest temporal resolution possible. Using the complete electric field as feedback, arbitrary laser pulse shapes can be optimally generated in two different ways. First, a local convergence algorithm can be used to apply reliable and accurate spectral chirps. Second, an evolutionary algorithm can be employed to reach specific temporal profiles. This pulse shaper will serve as the source for terahertz generator based on photoconductive switch using low temperature grown GaAs. After the generation of ultrafast terahertz pulses, we will investigate in details the pulse shaping effect on the terahertz pulses. Then, we will use this novel system to study and investigate semiconductors in the terahertz range.

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Study of Silicon Nanostructures
Research Area: Ultrafast Spectroscopy
Project leaders: Othonos, Andreas
Members: Tsangaris, Haralambos
Vahou, Elena
Kanari, Constantina
Lioudakis, Emmanouil
Funding: Research Promotion Foundation
Budget: EUR 150.000,-
Study of Silicon Nanostructures

The quest for silicon-based semiconductor material suitable for fabricating light emitting devices and lasers is of immense scientific and commercial interest. Silicon nanocrystals are a promising candidate material for such light emitting devices as well as modulators, optical amplifiers and other optoelectronic devices. Fabrication of these semiconductor materials and devices requires specialized and costly infrastructure that is not available in Cyprus at the moment. This project aimed to study in detail the fabrication and improvement of novel silicon nanocrystal based optoelectronic devices through the access of infrastructure at the Institute of Microelectronics (IMEL) at National Centre for Scientific Research “Demokritos” in Greece. A consortium of researchers from the University of Cyprus and IMEL combined their efforts toward this goal. The linear and non-linear optical properties of the nanocrystals were investigated and studied in depth. Emphasis was placed on understanding the ultrafast carrier dynamics using non-degenerate excite and probe techniques.

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NANODOMES - Ultrafast Characterization of Nanostructures
Research Area: Ultrafast Spectroscopy
Project leaders: Othonos, Andreas
Members: Papageorgiou, Polina
Perdiki, Marianna
Georgiou, George
Tsokkou, Demetra
Funding: Research Promotion Foundation
Budget: EUR 470.000,-
NANODOMES - Ultrafast Characterization of Nanostructures

This project aims to study in detail the linear and non linear dynamics in nanostructures. This will be accomplished with the help of new infrastructure that will be acquired though the funding of this project. The Research Center of Ultrafast Science will acquire a high repetition rate ultrafast amplifier system to provide the means of investigating dynamics on a femtosecond time scale in novel nanostructure material.

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Study of ultrafast carrier dynamics in InGaN Semiconductors
Research Area: Ultrafast Spectroscopy
Project leaders: Othonos, Andreas
Members: Tsokkou, Demetra
Georgiou, George
Rousogenous, Constantina
Funding: Research Promotion Foundation
Budget: EUR 220.000,-
Study of ultrafast carrier dynamics in InGaN Semiconductors

This project aims for an in-depth study of ultrafast carrier dynamics in nanostructure semiconductors following femosecond laser pulse excitation. The knowledge gain in this project will help in the development of InGaN based photovoltaic devices for solar harvesting.

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