University of California – TechConnect Briefs

Nano-Scale Effects in GaN-based Light-Emitting Diodes

Piprek J., Nakamura S., University of California, US

We here investigate the effects of built-in polarization on the properties of non-symmetric InGaN quantum wells. The impact of these nano-scale effects on the performance of blue light emitting diodes is analyzed utilizing advanced numerical [...]

Three-dimensional, Full-band, Quantum Modeling of Electron and Hole Transport Through Si/SiGe Nano-structures

Rivas C., Lake R., University of California, US

Full-band, three-dimensional (3D), atomistic, non-equilibrium Green fuction simulations are used to model Si nanowires. Full-band and single band calculations are compared. The effect of surface passivation is analyzed in the full-band simulations. Our approach to [...]

Lateral-Cavity Design for Long-Wavelength Vertical-Cavity Lasers

Piprek J., Bregy A., Jayaraman V., Chiu Y-J, Bowers J., University of California, US

For more than a decade, long-wavelength vertical-cavity lasers (VCLs) for fiber-optic applications are subject of intense research efforts. GaAs-based VCLs emitting at shorter wavelength (0.85-micron) have been commercialized successfully, however, the challenge of transferring this [...]

Micromechanical Pierce Oscillator for Resonant Sensing Applications

Seshia A.A., Low W., Bhave S.A., Howe R.T., Montague S., University of California, US

We present the design techniques and experimental characterization of a Pierce oscillator circuit adapted for micromechanical elements with resonant frequencies lying between 100 and 300 kHz. Micromechanical double-ended tuning fork resonators serve as the crystal [...]

Optimization of a MEMS Based Micro Capillary Pumped Loop for Chip-Level Temperature Control

Trebotich D., Kirshberg J., Teng J., Liepmann D., University of California, US

Recent results in the microfluidics group at the Berkeley Sensor and Actuator Center and the Air Force Research Laboratory have shown that a micro-capillary pumped loop (micro-CPL) can move extreme amounts of heat (< 200 [...]

3D MEMS Design via Matlab Interactive Plots

Lo N.R., Pister K.S.J., University of California, US

Matlab is utilized for 3D MEMS design. A preprocessor, written in C, processes the standard, 2D CIF design by applying the topology and spatial information to the design. The Mat3d toolkit then takes the output [...]

Modeling and Control of Nanomirrors for EUV Maskless Lithography

Chen Y., Shroff Y., Oldham W.G., University of California, US

The design of mirrors for use in EUV maskless lithography is presented in this paper. We propose a novel nanomirror system with a linear comb actuator, which has favorable stability and performance. A bias voltage [...]

Air-damping Effect on a Micro- and Nano-machined Beam Resonator

Xu G., Zhang C., Jiang Q., University of California, US

The air-damping effect on the resonant frequency and the quality factor of a micro- and nano-machined beam resonator is studied. The beam, placed in a uniform magnetic field, is driven to vibrate transversely by the [...]

Phase-Lead Compensator to Improve the Transient Performance of Comb Actuators

Chen Y., Shroff Y., Oldham W.G., University of California, US

The transient performance of electrostatic actuators is important in high-frequency switching operation of MEMS devices [1]. Optimization of the transient behavior of a simple actuator without introduction of controller network or modification of actuator shape [...]

Ab initio Molecular Dynamics Simulations of Aluminum Ion Solvation in Water Clusters

Lubin M.I., Bylaska E.J., Weare J.H., University of California, US

The results of ab initio molecular dynamics simulations of the solvation of Al3+ and its hdrolyzation products in water clusters are reported. Al3+ ions in water clusters (6<n<16) form a stable hexa-hydrate Al(H20)3+6 complex in [...]