Browsing Electronic & Electrical Eng (Scholarly Publications) by Author "DONEGAN, JOHN FRANCIS"

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  • Effect of ZnS Shell Thickness on the Phonon Spectra in CdSe Quantum Dots 

    DONEGAN, JOHN FRANCIS; RAKOVICH, YURY; MOORE, ALAN; PEROVA, TANIA (The American Physical Society, 2003)
    The evolution of the optical phonon spectra of colloidal core/shell CdSe/ZnS quantum dots with an increase of the shell thickness from 0.5 to 3.4 monolayers has been studied by resonant Raman spectroscopy. The results ...

  • Microtube cavities from templated filtering: confined optical modes and amplified spontaneous emission 

    MOORE, ALAN; GOUNKO, IOURI; DONEGAN, JOHN FRANCIS; PEROVA, TANIA; RAKOVICH, YURY (American Institute of Physics, 2006)
    The authors demonstrate a new route to the fabrication of individual aluminosilicate microtubes that can act as micron-scale optical cylindrical resonators. The microtubes were prepared using a simple vacuum assisted ...

  • Whispering gallery mode emission from photonic microtubes 

    DONEGAN, JOHN FRANCIS; GOUNKO, IOURI; PEROVA, TANIA; RAKOVICH, YURY (IEEE, 2006)
    We have found cylindrical glass microtubes can be formed by vacuum assisted filtration using a micro-channel glass matrix followed by thermal treatment of the material. The microtubes are strongly luminescent and exhibit ...

  • Whispering-gallery modes in photonic tubes 

    GOUNKO, IOURI; DONEGAN, JOHN FRANCIS; PEROVA, TANIA; RAKOVICH, YURY (Society of Photo-optical Instrumentation Engineers (SPIE), 2007)
    A new method has been developed to fabricate microtube resonators with strong whispering-gallery-mode emission and quality factors up to 3000.