Browsing Τμήμα Φυσικής / Department of Physics by Subject "Light absorption"
Now showing items 1-7 of 7
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Article
Direct observation of excitons in polymer/carbon nanotube composites at room temperature: The influence of nanotube concentration
(2008)In this work, we have employed spectroscopic ellipsometry technique to study the optical properties of polymer/carbon nanotube (CN) composites as a function of nanotube concentration. Using a two-layer structural model ...
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Femtosecond carrier dynamics of Inx Ga1-x N thin films grown on GaN (0001): Effect of carrier-defect scattering
(2007)Ultrafast carrier dynamics in ultrathin Inx Ga1-x N ternary alloys were investigated in detail, using femtosecond transient differential optical absorption measurements. Measurements were performed with probing wavelengths ...
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Article
Femtosecond time-resolved study in InxGa1-xN (0001) ultrathin epilayers: Effects of high indium mole fraction and thickness of the films
(2006)In view of promising full-solar-spectrum photovoltaic systems based on Inx Ga1-x N ternary alloys, femtosecond time-resolved study in ultrathin epilayers was employed in order to extract the fundamental properties of ...
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Article
Linear dynamic polarizability and the absorption spectrum of an exciton in a quantum ring in a magnetic field
(2011)The problem of an electron-hole system interacting through a contact potential and moving in a one-dimensional quantum ring threaded by an Aharonov-Bohm flux is considered, with respect to the system's energetics as well ...
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Monitoring charge exchange in P3HT-nanotube composites using optical and electrical characterisation
(2009)Charge exchange at the bulk heterojunctions of composites made by mixing single wall nanotubes (SWNTs) and polymers show potential for use in optoelectronic devices such as solar cells and optical sensors. The density/total ...
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Article
Temporal evolution of effects of ultrafast carrier dynamics in In 0.33Ga0.67N: Above and near the bandgap
(2007)Ultrafast carrier dynamics in the In0.33Ga0.67N epilayer were investigated in detail, using femtosecond transient differential non-degenerate optical absorption measurements. Following an excitation at 400 nm with fluence ...
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Article
Ultrafast transient photoinduced absorption in silicon nanocrystals: Coupling of oxygen-related states to quantized sublevels
(2007)The authors have studied transient photoinduced absorption in single monolayers of oxidized silicon nanocrystals. Transient photoinduced absorption measurements along with optical absorption and photoluminescence (PL) ...