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Creator | Title | Description | Subject | Date |
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Symko, Orest George | Acoustic approach to thermal management: miniature thermoacoustic engines | An acoustic approach to thermal management in electronics can be efficient and it can be directly interfaced with electronic devices. It is based on two types of thermoacoustic heat engines, which are being developed for microcircuit applications. One type of device, the prime mover, converts heat t... | Thermoacoustic engines; Thermal management | 2006 |
2 |
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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 |
3 |
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Dawson, Kyle | CCD testing and characterization for dark energy survey | A description of the plans and infrastructure developed for CCD testing and characterization for the DES focal plane detectors is presented. Examples of the results obtained are shown and discussed in the context of the device requirements for the survey instrument. | DES | 2006 |
4 |
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Vardeny, Zeev Valentine | Comment on "Large optical nonlinearity of semiconducting single-walled carbon nanotubes under resonant excitations" | In a recent Letter Maeda et al. studied the optical nonlinearities of single-walled carbon nanotubes (SWNT) films using both ??Z-scan?? and ??pump and probe?? (PP) techniques with ~100 fs time resolution [1]. They found that SWNTs have a large resonant third-order nonlinear optical susceptibili... | SWNT; Coherent artifact | 2006 |
5 |
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Vardeny, Zeev Valentine; Ehrenfreund, Eitan A. | Comment on "Yield of singlet excitons in organic light-emitting devices: a double modulation photoluminescence-detected magnetic resonance study" | In a recent Letter [1] Lee et al. studied the spin 1/2 photoluminescence-detected magnetic resonance (PLDMR) of a soluble derivative of poly-phenylene vinylene [MEH-PPV] using a double modulation scheme, where both the laser excitation intensity and the microwave power were modulated at ?ex and ?... | Singlet excitons; PLDMR; Poly-phenylene vinylene; MEH-PPV; Quenching; Spin dependent recombination; OLED | 2006 |
6 |
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Wu, Yong-Shi | Dynamics of giant-gravitons in the LLM geometry and the fractional quantum Hall effect | The LLM's 1/2 BPS solutions of IIB supergravity are known to be closely related to the integer quantum Hall droplets with filling factor v = 1, and the giant gravitons in the LLM geometry behave like the quasi-holes in those droplets. In this paper we consider how the fractional quantum Hall effect ... | | 2006 |
7 |
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Bromley, Benjamin C. | Eigenspectral computtations for linear gravity and nonlinear toy models | The periodic standing-wave approach to binary inspiral assumes rigid rotation of gravitational fields and hence helically symmetric solutions. To exploit the symmetry, numerical computations must solve for "helical scalars," fields that are functions only of corotating coordinates, the labels on the... | Binary black holes; General relativity; Standing wave | 2006 |
8 |
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Dawson, Kyle | High-voltage-compatible fully depleted CCDs | We describe charge-coupled device (CCD) development activities at the Lawrence Berkeley National Laboratory (LBNL). Back-illuminated CCDs fabricated on 200-300 fxm thick, fully depleted, high-resistivity silicon substrates are produced in partnership with a commercial CCD foundry. The CCDs are full... | Large Synoptic Survey Telescope; X-ray emission; XMM2235 | 2006 |
9 |
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Gondolo, Paolo | Physics of the very early universe: what can we learn from cosmological observations? | Cosmological observations are starting to probe the evolution of the Universe before nucleosynthesis. The observed fluctuations in the cosmic microwave background and in the distribution of matter can be traced back to their origin during inflation, and the inflaton potential has begun to be unrave... | Neutralinos; Inflatons; Moduli fields | 2006 |
10 |
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Vardeny, Zeev Valentine; Nahata, Ajay | Resonantly-enhanced transmission through a periodic array of subwavelength apertures in heavily-doped conducting polymer films | We observed resonantly-enhanced 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)]. The"anomalous transmission" s... | Resonantly enhanced transmission; Subwavelength apertures; Polypyrrole; PPy(PF6) | 2006 |
11 |
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Williams, Clayton C. | Single electron tunneling force spectroscopy of an individual electronic state in a non-conducting surface | A tunneling spectroscopy technique to measure the energy level of an electronic state in a completely nonconducting surface is demonstrated. Spectroscopy is performed by electrostatic force detection of single-electron tunneling between a scanning probe and the state as a function of an applied vo... | Tunneling; Spectroscopy; Single electron; Scanning tunneling microscope | 2006 |
12 |
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Lupton, John Mark | Stimulated emission depletion of triplet excitons in a phosphorescent organic laser | Triplet formation is investigated in an optically pumped polymer laser by detecting the phosphorescence emission after excitation. A clear correlation is observed between the onset of lasing and a saturation of phosphorescence intensity due to stimulated emission depletion of the singlet state and t... | Triplet excitons; Triplet formation; Emission depletion; Phosphorescent organic laser; Optically pumped polymer laser | 2006 |
13 |
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Gerton, Jordan | Tip-enhanced fluorescence microscopy of high-density samples | High-density samples of fluorescent quantum dots (QDs) were imaged using an apertureless near-field optical microscopy technique. QD fluorescence was modulated by oscillating a silicon atomic force microscope tip above an illuminated sample and a lock-in amplifier was used to suppress background fr... | | 2006 |
14 |
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Vardeny, Zeev Valentine | Universal properties of quasi-one-dimensional excitons in semiconducting single-walled carbon nanotubes and ∏-conjugated polymers | The nature of the primary photoexcitations in semiconducting single-walled carbon nanotubes (S-SWCNTs) is of strong current interest. We have studied the emission spectra of S-SWCNTs and two different rr-conjugated polymers in solutions and films, and have also performed ultrafast pump-probe spectr... | Carbon nanotubes; pi-conjugated polymers; SWCNT; Photoexcitation; Optoelectronic properties; Quasi-one-dimensional | 2006 |