Browsing by Subject "Band"

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    Donor-acceptor pair recombination in AgIn5S8 single crystals
    (American Institute of Physics, 1999-03-15) Gasanly, N. M.; Serpengüzel, A.; Aydınlı, Atilla; Gürlü, O.; Yilmaz, I.
    Photoluminescence (PL) spectra of AgIn5S8 single crystals were investigated in the 1.44-1.91 eV energy region and in the 10-170 K temperature range. The PL band was observed to be centered at 1.65 eV at 10 K and an excitation intensity of 0.97 W cm(-2). The redshift of this band with increasing temperature and with decreasing excitation intensity was observed. To explain the observed PL behavior, we propose that the emission is due to radiative recombination of a donor-acceptor pair, with an electron occupying a donor level located at 0.06 eV below the conduction band, and a hole occupying an acceptor level located at 0.32 eV above the valence band. (C) 1999 American Institute of Physics.
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    Electro-optic and electro-absorption characterization of InAs quantum dot waveguides
    (Optical Society of America, 2008-03) Akça, İmran B.; Dana, Aykutlu; Aydınlı, Atilla; Rossetti, M.; Li, L.; Fiore, A.; Dağlı, N.
    Abstract Optical properties of multilayer InAs quantum dot waveguides, grown by molecular beam epitaxy, have been studied under applied electric field. Fabry-Perot measurements at 1515 nm on InAs/GaAs quantum dot structures yield a significantly enhanced linear electro-optic efficiency compared to bulk GaAs. Electro-absorption measurements at 1300 nm showed increased absorption with applied field accompanied with red shift of the spectra. Spectral shifts of up to 21% under 18 Volt bias was observed at 1320 nm. (C) 2008 Optical Society of America.
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    The Ottoman Special organization - Teşkilat-ı Mahsusa : an inquiry into its operational and administrative characteristics
    (2012-09) Safi, Polat
    The usage or misuse of the terms, “intelligence” and “band”, has culminated in the production of a number of irreconcilable Special Organization (hereafter SO) definitions in literature, thereby leading to complications in the limitation of the scope of the subject matter. This thesis argues that the most effective way to understand and grasp the SO is closely related to the conceptualization of the term, “Teşkilat-ı Mahsusa”. In this way, a simple definitional model of the SO is produced, thus eliminating some ambiguities about the subject from the outset. This definition emphasizing the nature of the SO is also expected to act as an epistemic guide for the clarification of the operational and administrative characteristics of the SO.