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We present far-induced reflectivity spectra of seven samples of ceramic superconductors in the Ba-Y-Cu-O system with transition temperatures near 93K.

The frequency-dependent conductivity of Cu-O based superconductors is found to vary from sample to sample even in single-phase, bulk (twinned) crystals.

We analyze the waveguide properties of microstructure optical fibers consisting of a silica core surrounded by a single ring of large air holes.

We analyze the waveguide properties of microstructure optical fibers consisting of a silica core surrounded by a single ring of large air holes.

This paper reviews recent experimental and theoretical studies of InGaAs strained layer quantum wells and superlattices grown on InP and GaAs substrates.

We describe optical properties of ultra-small quantum wires and quantum wells structures based on In sub (x) Ga sub (1-x) As/InP.

We report the growth and characterization of multiple layers of self-organized InAs quantum dots emitting near 1.3microns.

Some of the most exciting prospects for future opto-electronic applications are those emerging from technologies based on GaAs.

We have studies the optical absorptions of a series of point defects in SiO sub 2 by means of time-dependent Density Funciotnla response theory, TD-DFT.

We explore theoretically the possibility of obtaining efficient light emission from Si-Ge semiconductor nano-onions.