Volume 83, Issue 2, 15 January 1998
Index of content:
- GENERAL PHYSICS: NUCLEAR, ATOMIC, AND MOLECULAR (PACS 01-39)
83(1998); http://dx.doi.org/10.1063/1.366751View Description Hide Description
We examine the validity of the hypothesis of self-similarity in systems coarsening under the driving force of interface energy reduction in which three dimensional particles are intersected by a one or two dimensional diffusion matrix. In both cases, solute fluxes onto the surface of the particles, assumed spherical, depend on both particle radius and interparticle distance. We argue that overall mass conservation requires independent scalings for particle sizes and interparticle distances under magnification of the structure, and predict power law growth for the average particle size in the case of a one dimensional matrix (3D/1D), and a weak breakdown of self-similarity in the two dimensional case (3D/2D). Numerical calculations confirm our predictions regarding self-similarity and power law growth of average particle size with an exponent 1/7 for the 3D/1D case, and provide evidence for the existence of logarithmic factors in the laws of boundary motion for the 3D/2D case. The latter indicate a weak breakdown of self-similarity.
83(1998); http://dx.doi.org/10.1063/1.366752View Description Hide Description
The grating light valve (GLV) is a micro-electromechanical reflection phase grating that operates on the electrostatic deflection of microbeams. In a conventional GLV, each beam is coated with a surface electrode that spans its length. In this paper, a GLV with partial electrode coverage is studied. An analysis is presented of the deflection profile and switching voltage for a series of electrode lengths. These results are compared with the performance of a conventional GLV.