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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Vardeny, Zeev Valentine | Polarization memory decay spectroscopy of photoexcitations in ∏-conjugated polymers: evidence for excimers | We used the technique of ultrafast transient polarized photomodulation in the visible/near-infrared range and polarization memory decay (PMD) spectroscopy to study the primary photoexcitations in films and solutions of two poly(phenylene-vinylene) (PPV) derivatives, namely, 2-methoxy-5-(2'-ethylhex... | Photoexcitations; pi-conjugated polymers; Polarization memory decay spectroscopy; PMD; DOO-PPV; MEH-PPV; Ultrafast transient polarized photomodulation; Intrachain singlet excitons; Excimers; Interchain charge transfer exciton | 2008-05 |
| 2 |
 | Vardeny, Zeev Valentine; Gellermann, Werner | Raman scattering gain in DOO-PPV films | We have investigated the optical emission characteristics of poly(2,5-dioctyloxy-p-phenylenevinylene) (DOO-PPV) thin films under high intensity ps pulsed laser excitation (Ipump > 1 MW/ cm2). We observed that the emission spectrum consist of a spectrally narrowed emission (SNE) band (FWHM ~ 10 nm)... | DOO-PPV; Raman scattering gain; Stimulated emission; Strongly coupled vibrations | 1997 |
| 3 |
 | Vardeny, Zeev Valentine | Directional emission from asymmetric microlaser resonators of ∏-conjugated polymers | A ∏-conjugated polymer film was fabricated into an asymmetric microlaser resonator having a quadrapole deformation with irregular boundaries and a Q factor of 600. At high excitation intensities above the threshold for lasing, we observed multimode laser emission spectra and directional emission a... | Directional emission; Asymmetric microlaser resonators; pi-conjugated polymers; DOO-PPV; poly(dioctyloxy) phenylene vinylene | 2004 |
| 4 |
 | Vardeny, Zeev Valentine | Studies of polymer microring lasers subject to uniaxial stress | The emission spectra of microring lasers fabricated from ∏-conjugated polymer films casted on nylon microfibers with diameters in the range of 35-90 µm were studied upon application of uniaxial stress with strain up to ~12%. The laser emission spectra substantially change with the applied stress,... | pi-conjugated polymers; Microring lasers; Uniaxial stress; DOO-PPV | 2007 |
| 5 |
 | Vardeny, Zeev Valentine | Unidirectional laser emission from ∏-conjugated polymer microcavities with broken symmetry | We report unidirectional laser emission from ∏-conjugated polymer microcavities with broken symmetry geometries such as spiral and microdisk containing a "line defect," in comparison with plain microdisk cavity having isotropic emission. We found that the laser emission directionality contrast ra... | pi-conjugated polymers; Unidirectional laser emission; Microcavities; DOO-PPV; Poly(dioctyloxy) phenyl vinylene | 2007 |
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