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Research Highlights Archive
Scalable arrays of rf Paul traps in degenerate Si
J. Britton, D. Leibfried, J. A. Beall, R. B. Blakestad, J. H. Wesenberg, and D. J. Wineland
We report techniques for the fabrication of multizone linear radio frequency Paul traps that exploit the machinability and electrical conductivity of degenerate silicon. The approach was tested by trapping and laser cooling 24Mg+ ions in the two following trap geometries: a single-zone two-layer trap and a multizone surface-electrode trap. One application of these devices is controlled manipulation of atomic ion qubits, the basis of one form of quantum information processing.
Energetic disorder limits energy transfer in semiconductor nanocrystal–DNA–dye conjugates
Klaus Becker, Andrey L. Rogach, Jochen Feldmann, Dmitri V. Talapin, and John M. Lupton
These results show the importance of the spectral overlap between emission of a single donor and absorption of a single acceptor in its close vicinity, which determines the microscopic resonance and transfer efficiency between individual neighbors. This has important implications on the applicability of ensemble spectral overlap for the analysis of distance dependencies of nanoscopic objects.
Direct near-field optical investigation of phase-change medium in blue-ray recordable and erasable disk
Jen-You Chu, Shen-Chuan Lo, Shu-Chen Chen, You-Chia Chang, and Juen-Kai Wang
We report a direct examination of recorded marks in blue-ray recordable and erasable disks with scattering-type scanning near-field optical microscopy. The revealed near-field signatures show a potential influence on the carrier-to-noise ratio of this optical storage medium.
Microassembly based on hands free origami with bidirectional curvature
Noy Bassik, George M. Stern, and David H. Gracias
Microassembly based on origami, the Japanese art of paper folding, presents an attractive methodology for constructing complex three-dimensional (3D) devices and advanced materials. We report a design framework that can be used to achieve spontaneous bidirectional folds with any desired angle, and we demonstrate theoretical and experimental realizations of complex 3D structures.
Nanosecond switching in GeTe phase change memory cells
G. Bruns, P. Merkelbach, C. Schlockermann, M. Salinga, M. Wuttig, T. D. Happ, J. B. Philipp, and M. Kund
The electrical switching behavior of GeTe-based phase change memory devices is characterized by time resolved experiments. Using GeTe or materials with similar crystal growth velocities, promises nonvolatile phase change memories with dynamic random access memorylike switching speeds.
Transfer of patterned vertically aligned carbon nanotubes onto plastic substrates for flexible electronics and field emission devices
T. Y. Tsai, C. Y. Lee, N. H. Tai, and W. H. Tuan
A direct transfer method for fabricating flexible electronics without the assistance of an adhesive layer and stamp is reported. This rapid and simple method provides an approach for the application of vertically aligned carbon nanotubes on plastic substrates.
Self-assembled bioinspired quantum dots: Optical properties
N. Amdursky, M. Molotskii, E. Gazit, and G. Rosenman
We report on quantum confinement phenomena found in peptide nanocrystalline regions formed within self-assembled peptide nanospheres. These bioinspired nanostructures exhibit the optical absorption characteristics of quantum dots with pronounced luminescence of excitons whose origin is at the UV region.
A piezomagnetoelastic structure for broadband vibration energy harvesting
Erturk,1 J. Hoffmann,2 and D. J. Inman
A piezomagnetoelastic device for substantial enhancement of piezoelectric power generation in vibration energy harvesting is introduced and results in a 200% increase in the open-circuit voltage amplitude (hence promising an 800% increase in the power amplitude).
Characterization of diamond ultraviolet detectors fabricated with high-quality single-crystalline chemical vapor deposition films
Y. Iwakaji, M. Kanasugi, O. Maida, and T. Ito
The detector performance had large quantum efficiencies due to an effective built-in current amplification function, fast temporal response, and high UV/visible sensing ratio, although the high-pressure/high-temperature-synthesized substrate used had considerable defects inducing visible light absorption and slow detector response. The usefulness of the bilayer detector structure employed is discussed.
Buckling beam micromechanical memory with on-chip readout
D. Roodenburg, J. W. Spronck, H. S. J. van der Zant, and W. J. Venstra
Two ways to implement a mechanical memory are discussed: compensation of initial beam imperfections and snap through of the postbuckled beam. Although significant relaxation effects are observed, both methods prove reliable over thousands of write cycles.
