Browsing by Author "Kalli, Kyriacos"
Now showing items 1-17 of 17
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Article
Characterization of reflectivity inversion, alpha- and beta-phase transitions and nanostructure formation in hydrogen activated thin Pd films on silicon based substrates
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos (2002)Optically thin palladium metal films evaporated on different silicon based substrates are investigated following exposure to different concentrations of hydrogen gas in air. Laser modulated reflectance off the palladium ...
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Article
CONDENSED MATTER
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; Anita Lloyd Spetz; Ingemar Lundstrom (1998)
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Conference Object
Femtosecond laser inscription of Bragg and complex gratings in coated and encapsulated silica and low-loss polymer optical fibers
Kalli, Kyriacos; Lacraz, A.; Polis, M.; Othonos, Andreas S. (SPIE, 2015)The development of wavelength filters, such as Bragg and superstructure gratings in glass and polymer optical fibers, using a femtosecond laser is reported. By using a femtosecond laser operating in the green, which offers ...
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Book
Fiber Bragg gratings fundamentals and applications in telecommunications and sensing
Othonos, Andreas S.; Kalli, Kyriacos (Artech House, 1999)
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Article
Fibre Bragg gratings
Othonos, Andreas S.; Kalli, Kyriacos; Pureur, D.; Mugnier, A. (2006)
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Article
Hydrogen gas detection via photothermal deflection measurement
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos (1997)A study of a thermal wave hydrogen sensor interrogated via transverse optical beam deflection spectroscopy is presented. The sensor is a thin film polyvinylidene fluoride film coated with a thin palladium layer. The ...
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Article
Instrumentation for the monitoring of toxic pollutants in water resources by means of neural network analysis of absorption and fluorescence spectra
Kuzniz, T.; Halot, D.; Mignani, A. G.; Ciaccheri, L.; Kalli, Kyriacos; Tur, M.; Othonos, Andreas S.; Christofides, Constantinos; Jackson, D. A. (2007)The concentration of several pollutants, usually present in industrial waste waters, is predicted by the neural network data processing of absorption and fluorescence measurements in the visible spectral range. Proper ...
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Article
Nondestructive evaluation of metal contaminated silicon wafers using radiometric measurements
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; Tardiff, F. (1999)We have performed nondestructive measurements on metal contaminated silicon wafers using photothermal radiometric measurements. Data were collected as a function of modulation frequency and time, showing clear distinctions ...
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Article
Optical response of thin supported palladium films to hydrogen: Non-destructive testing for hydrogen detection
Christofides, Constantinos; Kalli, Kyriacos; Othonos, Andreas S. (1999)The properties of thin palladium films on silicon dioxide/silicon substrates are investigated. As the electrical properties of very thin palladium films cannot be measured, due to highly discontinuous nature of the films ...
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Article
Optically thin palladium films on silicon-based substrates and nanostructure formation: effects of hydrogen
Othonos, Andreas S.; Kalli, Kyriacos; Tsai, D. P. (2000)Optically thin palladium films evaporated on different silicon-based substrates are investigated following exposure to different concentrations of hydrogen gas in air. Laser modulated reflectance off the palladium surface ...
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Article
Photomodulated thermoreflectance detection of hydrogen gas using optically thin palladium film on silicon oxide
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; Lundstrom, I. (1998)The sensitivity various thicknesses of optically thin film palladium layers evaporated onto silicon oxide substrate is investigated in the presence of a hydrogen/air atmosphere at room temperature. The magnitude of the ...
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Article
Photothermal radiometric measurements on metal contaminated silicon wafers
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; F Tardiff (1999)Photothermal radiometric measurements were performed on metal contaminated silicon wafers. Data were collected over modulation frequencies ranging from 0.1 to 100kHz, with a Kr-Ar ion laser used as the excitation source. ...
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Article
Room temperature hydrogen gas detection with optically thin palladium films on silicon oxide using photomodulated thermoreflectance
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; Spetz, A.; Ingemar Lundström (1999)The sensitivity of various thicknesses of optically thin film Pd layers evaporated into a silicon oxide substrate is investigated in the presence of a hydrogen/air atmosphere at room temperature. The magnitude of the ...
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Article
Solar-Collector Industry in Cyprus: Technico-Economic Analysis and Future Perspectives
Korniotis, George; Kalli, Kyriacos; Christofides, Constantinos (1999)Deals with the industry of solar water heaters (SWH) in Cyprus. History of SWH in the country
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Article
STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER (PACS 61-68, 78)-Nondestructive evaluation of metal contaminated silicon wafers using radiometric measurements
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; F Tardiff (1999)
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Article
Temperature-induced reflectivity changes and activation of hydrogen sensitive optically thin palladium films on silicon oxide
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos; Spetz, AL; Lundstrom, I. (1998)The optical properties of several thin metal film palladium-silicon oxide structures are examined at room temperature before and after annealing to 200 degrees C and also at 90 degrees C-in all cases in the presence of ...
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Article
Thermal wave hydrogen gas sensor characterized via photothermal deflection measurements
Kalli, Kyriacos; Othonos, Andreas S.; Christofides, Constantinos (1999)A study of a thermal wave hydrogen sensor characterized using transverse optical beam deflection measurements is presented, including a comparison of experimental data with a simple theoretical model. The sensor consists ...