Mile Ivanda

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The solar cells efficiency may be improved by better exploitation of the solar spectrum, making use of the down-conversion mechanism, where one high energy photon is cut into two low energy photons. The choice of the matrix is a crucial point to obtain an efficient down-conversion process with rare-earth ions. When energy transfer between rare earth ions is(More)
Fiber lasers are a fast growing class of lasers due to their reliability, efficiency and flexibility. This has made fiber lasers a versatile tool for manufacturing, sensing and healthcare, not forgetting the contribution of Erbium-doped amplifiers to optical communications. Yet available wavelengths by direct emission are quite restricted to the visible and(More)
Surface enhanced Raman spectroscopy is an important technique for detection of wide number of analytes. Today, there is a growing need for the development of stable, sensitive, reproducible and portable SERS-active substrates for use in different fields. Some of the most extensively used SERS substrates are metal colloids. However, the use of the colloid(More)
Technologically modified g-GeS<sub>2</sub>(TiVj) glasses prepared by melt quenching from different temperatures (T<sub>i</sub>) and with different cooling rates (Vj) were studied using Raman spectroscopy and model calculations. Differential Raman spectra {I<sub>R</sub>GeS<sub>2</sub>(T<sub>i</sub>V<sub>1</sub>)-I<sub>R</sub>GeS2(T<sub>2</sub>V<sub>1</sub>)}(More)
Tellurite glasses are known as a promising material for optical fiber fabrication thanks to the specific optical and thermo-mechanical features. This paper shows tellurite glasses doped with different concentrations of various rare earth ions characterized by Raman spectroscopy. Especial attention was paid to the low frequency `Boson peak' and the modes of(More)
Silver colloids were produced by chemical reduction of silver salt (silver nitrate, AgNO<sub>3</sub>) solution. As a reducing agents trisodium citrate, sodium borohydride, ascorbic acid, PVP (Polyvinylpyrrolidone) and glucose were used. The characters of silver nanoparticles were investigated using UV-Vis spectrophotometer, dynamic light scattering (DLS),(More)
We present some results regarding the coating of spherical microresonators and their different applications in photonics. The spherical microresonators high Q-factor and low mode volume make them perfect for a number of photonics applications. A thin film coating on the surface of the resonator using an optically active or passive layer can be used to(More)