|
|
Creator | Title | Description | Subject | Date |
| 1 |
 |
Ailion, David Charles | Nuclear double resonance: cross relaxation rates between two spin species | A rotating-frame nuclear-double-resonance experiment is reported in which the cross-relaxation rates between 7Li and 6Li in powdered lithium metal were measured. The theory developed my McArthur, Hahn, and Walstedt (MHW) is applied to these data and good agreement is obtained. We also apply this t... | Nuclear-double-resonance; Lithium; MHW; Cross-relaxation | 1977 |
| 2 |
 |
Mattis, Daniel C. | Theory of the anomalous skin effect in normal and superconducting metals | Chambers' expression for the current density in a normal metal in which the electric field varies over a mean free path is derived from a quantum approach in which use is made of the density matrix in the presence of scattering centers but in the absence of the field. An approximate expression use... | Skin effect | 1958-07 |
| 3 |
 |
Ailion, David Charles | Effect of the translational diffusion mechanism on the low-field NMR spin-lattice relaxation time in the rotating reference frame: calculation of order parameter | The effect of the translational-diffusion mechanism on the low-field NMR spin-lattice relaxation time in the rotating reference frame is calculated for simple cubic, body-centered cubic, and face-centered cubic lattices. The results of these calculations suggest a new method for determining the pref... | NMR; Nuclear magnetic resonance; Lattices; Relaxation time | 1968 |
| 4 |
 |
Vardeny, Zeev Valentine; Gellermann, Werner | Near-infrared ps transient photoinduced absorption in conjugated systems | We demonstrate the use of a color center laser in a pump-and-probe correlation technique which enables us to extend the probe spectral range into the infrared. As a result, we find strong photoinduced infrared absorption in several 7t-conjugated polymers and oligomers. We associate this absorption w... | Ultrafast spectroscopy; Color center laser; Photoinduced absorption; Singlet excitons; Even parity states; Odd parity states; Infrared absorption | 1997 |
| 5 |
 |
Vardeny, Zeev Valentine; Efros, Alexei L. | Optical studies of 2D and 3D metallo-dielectric photonic crystals | We have fabricated and studied two-dimensional (2D) and three-dimensional (3D) metallo-dielectric photonic crystals (MDPC) in the visible/near ir spectral range using a variety of optical techniques. The 2D MDPC showed anomalous transmission due to surface plasmon polaritons in resonance with the ph... | Metallo-dielectric photonic crystals; Organic light emitting diodes; Anomalous transmission; surface plasmon polaritons; Opal photonic crystals; Metal infiltrated opals; Optical reflectivity; Transmission spectra | 2005 |
| 6 |
 |
Vardeny, Zeev Valentine; Raikh, Mikhail E. | Emission spectrum of a dipole in a semi-infinite periodic dielectric structure: effect of the boundary | The emission spectrum of a dipole embedded in a semi-infinite photonic crystal is calculated. For simplicity we study the case in which the dielectric function is sinusoidally modulated only along the direction perpendicular to the boundary surface plane. In addition to oscillations of the emission... | Emission spectrum; Dipole; Periodic dielectric structure | 2000-07 |
| 7 |
 |
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 |
| 8 |
 |
Vardeny, Zeev Valentine | Ultrafast femtosecond relaxation processes in luminescent and nonluminescent conducting polymers | We have employed the time-resolved photomodulation (PM) technique to study the photoexcitation dynamics in a luminescent (Si-PT) and nonluminescent ( s-(CH)x ) conducting polymers in the low signal limit. In each polymer, we identify two exponential decay processes in the PM decay, with characterist... | Ultrafast femtosecond relaxation; Femtosecond spectroscopy; Pump-and-probe technique; PM decay; Polarization memory; Bi-exponential response | 1997 |
| 9 |
 |
Vardeny, Zeev Valentine | Studies of Raman scattering in novel disubstituted acetylene polymers | We have studied resonant and non-resonant Raman scattering spectra in thin films of novel disubstituted acetylene polymers such as poly(l-ethyl-2-phenylacetylene) (PEtPA), poly(l-n-hexyl-2-phenylacetylene) (PHxPA) and poly(l-phenyl-2-/wibutylphenylacetylene) (PDPA-nBu), which possess high photolumin... | Raman scattering; Disubstituted acetylene polymers | 1997 |
| 10 |
 |
Vardeny, Zeev Valentine | Optical probes of pristine and C60-doped silicon-bridged PT polymer; a novel highly luminescent, low bandgap polymer | Silicon bridged PT polymer (PTSi) is a new soluble polymer with a strong luminescence in the infrared band (0-0 transition at 1.6 eV). We have applied various spectroscopies such as absorption, electroabsorption (EA), photo induced absorption (PA), electromodulated PA (EPA), photoluminescence (PL) a... | Silicon bridged PT polymer; Low bandgap pi-conjugated polymer; C60 doping; Electric field induced exciton dissociation | 1997 |
| 11 |
 |
Vardeny, Zeev Valentine; Raikh, Mikhail E. | Anomalous coherent backscattering of light from opal photonic crystals | We studied coherent backscattering (CBS) of light from opal photonic crystals with incomplete band gaps. We observed a dramatic broadening of the CBS cone for incident angles close to the Bragg condition in the crystals. We modify the conventional CBS theory to incorporate Bragg attenuation resultin... | Coherent backscattering; Bragg condition | 2001-05 |
| 12 |
 |
Vardeny, Zeev Valentine | Electromodulated photoinduced absorption; a new spectroscopy in ∏-conjugated polymer/C60-blends | We have applied the electromodulated photoinduced absorption (EPA) technique to a variety of C 6 0 -doped and pristine luminescent conducting polymer films. EPA measures the electric field-related change of the absorption in the sample as a result of above-gap illumination. An electric field leads t... | Electromodulated photoinduced absorption; EPA; C60 doping; Electromodulated photoluminescence; EPL; Polaron pair polarizability | 1997 |
| 13 |
 |
Vardeny, Zeev Valentine; Nahata, Ajay | Anomalous transmission through heavily doped conducting polymer films with periodic subwavelength hole array | We observed resonantly enhanced (or anomalous transmission) terahertz transmission through two-dimensional (2D) periodic arrays of subwavelength apertures with various periodicities fabricated on metallic organic conducting polymer films of polypyrrole heavily doped with PF6 molecules [PPy(PF6)]. Th... | | 2006 |
| 14 |
 |
Kieda, David B. | Antarctic impulsive transient antenna (ANITA) instrumentation | We will report on the details of the ANITA instrument. This instrument is fundamentally a broadband antenna, which is arrayed and constructed in such a way as to be optimized for the detection and characterization of high-energy neutrino cascades [1]. The requirement to maximize the detector view of... | ANITA; Antarctic Impulsive Transient Antenna; Neutrino; Balloon; Antarctica | 2003 |
| 15 |
 |
Vardeny, Zeev Valentine; Gellermann, Werner | Laser properties of luminescent conducting polymers in open resonators | We have investigated the lasing properties of several luminescent conducting polymers, i.e. DOO-PPV and the bi-substituted polyacetylenes PDPA-nBu, and PHJPA, dissolved in various polar and non-polar solvents. PP V polymers emit with high quantum efficiencies in broad emission bands centered in the ... | Lasing; Amplified spontaneous emission; Spectral narrowing | 1997 |
| 16 |
 |
Vardeny, Zeev Valentine | Optical studies of ordered and disordered α-sexithiophene films | We have studied α-sexithiophene (α-6T) films by photoinduced absorption (PA) and optically-detected magnetic resonance (ODMR). The PA of the disordered film is composed of two polaron PA bands and one bipolaron PA band, each with its own vibronic side bands. Measurements of an ordered film indicat... | Optically detected magnetic resonance; Sexithiophene conjugated oligomer | 1997 |
| 17 |
 |
Vardeny, Zeev Valentine; Ehrenfreund, Eitan A. | Phonon spectroscopy in π-conjugated polymers; the role of the excited electronic states | The Raman active vibrational modes in 7r-conjugated polymers are known to have different frequencies in different types of experiments. The best known examples are the resonant Raman scattering (RRS) and doping or photoinduced absorption infrared active vibrations (IRAV) measurements, in which the s... | pi-conjugated polymers; Phonon spectroscopy; Resonant Raman scattering; ir-active phonons | 1997 |
| 18 |
 |
Kieda, David B. | High resolution charge measurements of UH cosmic ray nuclei using a direct imaging Cherenkov ground-based observatory | The accurate determination of the elemental composition of cosmic rays at high energies is expected to provide crucial clues on the origin of these particles. Here we discuss a technique that has become possible through the use of modern ground-based Cherenkov imaging detectors. We combine a measure... | Cherenkov light; Quark star; UH nuclei; Magnetic monopole | 2003 |
| 19 |
 |
Vardeny, Zeev Valentine | Photoexcitation dynamics in C60-doped PPV under bias illumination | We have studied photoexcitation dynamics in pristine and C60-doped PPV films under bias Olumination by photoinduced absorption (PA), optically-detected magnetic resonance (ODMR), and electromodulated PA (EPA). Intrachain polaron pair species are the dominant excitations under these conditions. The p... | Photoexcitation dynamics; C60-doped PPV; Bias illumination; PPV films; Photoinduced absorption; ODMR; Electroabsorption | 1996 |
| 20 |
 |
Vardeny, Zeev Valentine; Nahata, Ajay | THz anomalous transmission in plasmonic lattices; incidence angle dependence | The phenomenon of anomalous transmission through subwavelength aperture arrays in metallic films (plasmonic lattices) is thought to be mediated by surface plasmon polaritons (SPP) on the film surfaces. Using terahertz time-domain spectroscopy we systematically studied the anomalous transmission spec... | THz anomalous transmission; Plasmonic lattices; Incidence angle dependence; THz radiation; Light polarization; Effective dielectric response; Notch filter | 2009 |
| 21 |
 |
Lupton, John Mark | Device model for polymer light emitting diodes: effect of temperature and oxidation | We present a temperature-dependent single carrier device model for polymer light-emitting diodes. The model includes both the injection of charge carriers over a barrier and the transport of charges across the device. To test the model, the temperature dependence of an LED based on the conjugated po... | Single carrier; Temperature dependent; Poly(phenylene vinylene); Transport measurements; ITO; Disorder | 1999 |
| 22 |
 |
Vardeny, Zeev Valentine; Raikh, Mikhail E. | Excitations in opal photonic crystals infiltrated with polarizable media | Photonic crystals (PC) are a class of artificial structures with a periodic dielectric function. PCs can be a laboratory for testing fundamental processes involving interactions of radiation with matter in novel conditions. We have studied the optical properties of opal PCs that are infiltrated with... | Opal photonic crystals; Polarizable media; Bragg gap; Polaritonic gap; Photonic stop band | 2002 |
| 23 |
 |
Vardeny, Zeev Valentine | Optical probes of photoexcitations in fullerene thin films from femtoseconds to milliseconds | We have studied photoexcitations in various fiillerene thin films using transient photomodulation and photoluminescence from 100 fs to 50 ms and absorption-detected magnetic resonance (ADMR). We show that singlet Frenkel type excitons are the primary photoexcitations; their recombination kinetics in... | Photoexcitations; Femtosecond; Transient photomodulation; Transient photoluminescence; Frenkel type excitons; Triplet excitons | 1995 |
| 24 |
 |
Vardeny, Zeev Valentine | Picosecond photomodulation spectroscopy in amorphous semiconductors | Picosecond trapping of photogenerated carriers in gap states of doped, compensated and undoped amorphous hydrogenated silicon (a-Si:H) and of a-Si:H based superlattices was studied by the pump and probe photomodulation technique. In undoped a-Si:H the photogenerated carries are trapped in band-tail ... | Picosecond spectroscopy | 1987 |
| 25 |
 |
Vardeny, Zeev Valentine; Gellermann, Werner | Two-photon absorption spectra of luminescent conducting polymers measured over a wide spectral range | We report the two-photon absorption (TPA) spectra of poly(2,5-dibutoxy-p-phenylene acetylene) (PPADBO), poly(2,5-dioctyloxy-p-phenylene vinylene) (PPV-DOO), and poly(3-hexylthiophene) (PAT6) in the spectral range extending from 576 nm to 846 nm. Using the Z-scan technique on the polymers in solutio... | Two-photon absorption; Two-photon saturation; Luminescent polymers; Dispersion; Polymer solution; PPA-DBO | 1997 |
