Multilayered optical memories

Zhongcheng Liang, Tao Yang, Hai Ming +1 more

In this paper, we propose a novel method of three dimensional optical storage by the use of multilayered waveguide memory (MWM). The MWM structure is described and its work principle is introduced. Some properties and merits of MWM are also discussed in comparison with other 3D optical data storage methods.

Paul W. Nutter

Arun Madan, Melvin P. Shaw

Susanne Lomatch, E. D. Rippert, John B. Ketterson

Flux quantum logic and memory circuits using superconducting Josephson tunnel junctions have high-speed switching times (approximately 1 ps), low power dissipation (< 1 (mu) W per circuit) and low levels of thermally induced electrical noise. Current designs of such circuits employ single trilayer junctions, which impose circuit size and logic threshold limitations. A new design component, the multilayered tunnel junction, consists of a vertically stacked array (a 1D superlattice) of Josephson tunnel junctions. The introduction of multilayered junctions into superconducting electronic circuitry offers a reduction in the current device size, fault tolerances, and new device applications. We present numerical simulations of simple circuits employing multilayered Josephson junctions as design components. Comparison with conventional single flux quantum circuitry is discussed. We also present preliminary measurements of multilayered Josephson junctions fabricated for use in flux quantum devices.

Yoshito Tsunoda

Z. Hasan, J. L. Park, Francisco J. Bezares +1 more

Spectral Storage using optical holeburning has the potential of providing ultrahigh densities approaching terabits per square inch. The progress on multilayer spectral storage in Eu-doped sulfides has been presented. It is shown that atomic scale tailoring of these structures is possible in order to design several different europium optical centers. In the spectrum of these centers, ultrahigh density storage can be achieved with the simultaneous optimization of other performance parameters. Results are also presented for tailoring the barrier and the capping layers.