University of California, Los Angeles – Page 2

Add-Drop Filters utilizing Vertically Coupled Microcavities in Silicon

Koonath P., Indukuri T., Jalali B., University of California, Los Angeles, US

Micro-resonant optical cavities facilitate dense integration of optical devices on a chip. Through vertical integration of devices, precise control over the critical dimension of the structure can be achieved. Add-drop multiplexers based on vertically coupled [...]

Multiscale Modeling of Self-Organized Mono-layer Surface Atomic Clusters

Hu Q., Ghoniem N.M., Walgraef D., University of California, Los Angeles, US

We present here a novel multiscale modeling approach to investigate the conditions for atomic cluster self-organization on atomically flat substrates during epitaxy deposition processes. A phase field model is developed for the free energy of [...]

Flame Made Nanoparticles for Gas Sensors

Mädler L., Pratsinis S.E., Sahm T., Gurlo A., Barsan N., Weimar U., University of California, Los Angeles, CH

Flame aerosol technology is one of the most widely used synthesis routes in manufacturing of commercial quantities of nanoparticles. The application of flame spray pyrolysis further broadens the spectrum of flame made powders and their [...]

Strain and Structure in Nanocrystals

Bae Y., Caflisch R.E., University of California, Los Angeles, US

Layered nanocrystals consist of a core of one material surrounded by a shell of a second material. Because of the small size of these systems, their atomic structure is epitaxial in many cases. Lattice mismatch [...]

Structure Determination of Small Metal Clusters by Density-Functional Theory and Comparison with Experimental Far-Infrared Spectra

Ratsch C., Fielicke A., Behler J., Scheffler M., von Helden G., Meijer G., University of California, Los Angeles, US

The far-infrared vibrational spectra for charged vanadium clusters as well as charged and neutral niobium clusters have been measured size specifically using farinfrared multiple photon dissociation. The ground state energy and vibrational spectra of a [...]

The Level-Set Method for Modeling Epitaxial Growth

Ratsch C., Petersen M., Caflisch R.E., University of California, Los Angeles, US

A level-set model for the simulation of epitaxial growth is described. In this model, the motion of island boundaries of discrete atomic layers is determined by the time evolution of a continuous level-set funciton psi. [...]

What to do with Statistical Mechanics when the Figure of Merit Cannot be Calculated: Library Design for High-Throughput Materials Development

Deem M.W., University of California, Los Angeles, US

By analogy with Monte Carlo algorithms, we discuss new strategies for design and redesign of libraries in high-throughput experimentation, or combinatorial chemistry. Several Monte Carlo methods are examined, including Metropolis, several types of biased schemes, [...]

The Level-Set Method for Modeling Epitaxial Growth

Ratsch C., Petersen M., Caflisch R.E., University of California, Los Angeles, US

A level-set model for the simulation of epitaxial growth is described. In this model, the motion of island boundaries of discrete atomic layers is determined by the time evolution of a continuous level-set funciton psi. [...]

What to do with Statistical Mechanics when the Figure of Merit Cannot be Calculated: Library Design for High-Throughput Materials Development

Deem M.W., University of California, Los Angeles, US

By analogy with Monte Carlo algorithms, we discuss new strategies for design and redesign of libraries in high-throughput experimentation, or combinatorial chemistry. Several Monte Carlo methods are examined, including Metropolis, several types of biased schemes, [...]

Strength Prediction for MEMS Components Transferring Large Loads

Chu L-H., Chen Q., Carman G.P., University of California, Los Angeles, US

In this paper the authors present a new strength criteria combined with a finite element analysis to predict the strength of MEMS fabricated microridges. The single crystal silicon microridges can be manufactured by various processes [...]