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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Lupton, John Mark | Air-induced fluorescence bursts from single semiconductor nanocrystals | We observe a dramatic enhancement of the fluorescence intensity from single core/shell CdSe/ZnS nanocrystals upon sudden exposure to air from an evacuated surrounding. Both the number of particles contributing to emission increases as well as the average emission intensity from a single particle, le... | CdSe; ZnS; Air-induced; Fluorescence bursts | 2004 |
| 2 |
 | 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 |
| 3 |
 | Scarpulla, Michael | Effects of pressure on the band structure of highly mismatched Zn1-yMnyOxTe1-x alloys | We report photomodulation spectroscopy measurements of the pressure dependence of the optical transition in Zn12yMnyOxTe1-x alloys that is associated with the lowest Ѓ conduction band (termed E2 subband). The pressure-induced energy shift of the E2 transition is nonlinear and much weaker as compare... | Highly mismatched alloys; Zinc telluride; Anticrossing | 2004 |
| 4 |
 | Saam, Brian; Laicher, Gernot | Liquid hyperpolarized 129Xe produced by phase exchange in a convection cell | We present a method for the production of liquid hyperpolarized 129Xe that employs spin-exchange optical pumping in the gas phase and subsequent phase exchange with a column of xenon liquid. A convection loop inside the sealed glass cell allows efficient transfer of magnetization between the gas an... | Liquid hyperpolarized 129Xe; Phase exchange; Spin-exchange optical pumping; SEOP; NMR; Spin polarization | 2004 |
| 5 |
 | Lupton, John Mark | Low-threshold polymeric distributed feedback lasers with metallic contacts | Optical losses in waveguides comprising metallic contacts are thought to be a major hurdle to the realization of organic laser diodes. We demonstrate here that careful tuning of the waveguide mode in flexible distributed feedback lasers can allow lasing action to occur in organic thin films in the p... | Metallic contacts; Organic laser diodes; Waveguides; Feedback lasers | 2004 |
| 6 |
 | Vardeny, Zeev Valentine | Optical and magneto-optical studies of two-dimensional metallodielectric photonic crystals on cobalt films | We studied the optical transmission and magneto-optical effect through a subwavelength hole array fabricated on a ferromagnetic cobalt (Co) thin film in comparison to a control unperforated Co film having the same thickness. We found that the perforated film sustains extraordinary transmission bands... | Metallodielectric photonic crystals; Cobalt films | 2004 |
| 7 |
 | Vardeny, Zeev Valentine | Random lasing in human tissues | A random collection of scatterers in a gain medium can produce coherent laser emission lines dubbed "random lasing." We show that biological tissues, including human tissues, can support coherent random lasing when infiltrated with a concentrated laser dye solution. To extract a typical random reson... | Random lasing; Gain medium; Human tissues; Malignant tissues | 2004 |
| 8 |
 | Lupton, John Mark | Ultrafast intramolecular energy transfer in single conjugated polymer chains probed by polarized single chromophore spectroscopy | Single molecule spectroscopy of rigid-rod ladder-type conjugated polymers reveals individual chromophore units on a polymer chain, exhibiting fluorescence linewidths of less than 1 nm. Whereas the fluorescence from a single chromophore is fully linearly polarized at low temperatures, a number of exc... | Single molecule spectroscopy; Intramolecular energy transfer; Chromophore spectroscopy; Chromophores; Rigid-rod; Ladder-type | 2004 |
| 9 |
 | Tiwari, Ashutosh | Zn0.9Co0.1O-based diluted magnetic semiconducting thin films | Here we report a systematic study of structural, optical, and magnetic measurements on epitaxial Zn0.9Co0.1O films grown on c-plane sapphire single crystal, at various temperatures (500-650°C), using pulsed-laser deposition. The main emphasis in this work has been on the correlation of microstructu... | ZnO; Cobalt | 2004 |
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