A recently developed inverse scattering algorithm [A. J. Devaney and M. Dennison, Inverse Probl., 19, 855 (2003) and M. Dennison and A. J. Devaney, Inverse Probl., 20, 1307 (2004)] is described and applied in a computer simulation study of optical diffraction tomography (ODT). The new algorithm is superior to standard ODT reconstruction algorithms, such as the filtered backpropagation algorithm...

We report a versatile all optical technique to excite and read-out a distributed nanoelectromechanical systems (NEMS) array. The NEMS array is driven by a distributed, intensity modulated optical pump through the photothermal effect. The ensuing vibrational response of the array is multiplexed onto a single probe beam in the form of a high frequency phase modulation. The phase modulation is opt...

Angle-resolved reflectivity has been measured from single-domain photonic crystals consisting of air spheres in a TiO2 backbone. Monochromatic beams are focused to a 10 microm spot, and kept on the rotation axis with a precision better than 10 microm. We report high reflectivity up to 94% and surface domains as large as 200 microm, with a mosaic spread of +/-3 degrees. The maximum reflectivity ...

Residual stresses generated by macroscopic inhomogeneous plastic deformation are predicted by an explicit finite element (FE) technique. The numerical predictions are evaluated by characterizing the residual elastic strains by neutron diffraction using two different (hkl ) reflections. Intergranular residual elastic strains between subsets of grains are predicted numerically and verified by neu...

Conditional optimization allows unlabelled loose-atom refinement to be combined with extensive application of geometrical restraints. It offers an N-particle solution for the assignment of topology to loose atoms, with weighted gradients applied to all possibilities. For a simplified test structure consisting of a polyalanine four-helical bundle, this method shows a large radius of convergence ...