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11 results on '"Jurbergs, D."'

7. Enhanced Wavelength Selectivity in Molecular Dye Modified High-T<INF>c</INF> Superconducting Detectors Using Mirror-Layer Structures

Author

Jurbergs, D. C., Savoy, S. M., Zhao, J., Eames, S. J., and McDevitt, J. T.

Abstract

A new method for enhancing the wavelength selectivity and responsivity of hybrid dye/superconductor optical sensors is described. Here, reflective “mirror layers” deposited atop the high-temperature superconductor, YBa2Cu3O7-δ, are used to enhance the optical performance characteristics of such hybrid sensors. Quantification of the wavelength selectivity for such detector structures is detailed for both dye/high-Tc superconductor and dye/mirror-layer/high-Tc superconductor systems. Optical studies suggest that the inclusion of the mirror layer serves to enhance the wavelength selectivity by reducing the amount of off-resonance signal generated by the detector. On the other hand, the on-resonance signals captured by the dye layer are effectively sensed by the superconductor element. Measurement of the wavelength-dependent optical responsivity of the mirror-layer-modified hybrid detectors shows that energy transfer between the dye and superconducting elements is not diminished by the presence of this reflective layer.

Published
1997

11. Size-dependent intrinsic radiative decay rates of silicon nanocrystals at large confinement energies.

Author

Sykora M, Mangolini L, Schaller RD, Kortshagen U, Jurbergs D, and Klimov VI

Abstract

We study ultrafast photoluminescence (PL) dynamics of Si nanocrystals (NCs). The early-time PL spectra (<1 ns), which show strong dependence on NC size, are attributed to emission involving NC quantized states. The PL spectra recorded for long delays (>10 ns) are almost independent of NC size and are likely due to surface-related recombination. Based on instantaneous PL intensities measured 2 ps after excitation, we determine intrinsic radiative rate constants for NCs of different sizes. These constants sharply increase for confinement energies greater than approximately 1 eV indicating a fast, exponential growth of the oscillator strength of zero-phonon, pseudodirect transitions.

Published
2008
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