Ultrathin metamaterial layers are modeled by a homogeneous bi-anisotropic film to represent various kinds of broken symmetries in photonic nanostructures, and specifically in optical metamaterials and metasurfaces. Two algorithms were developed to obtain the electromagnetic (EM) wave response from a metasurface (direct solver) or the metasurface parameters from the EM wave response (inverse sol...

We study the two-dimensional extension of the Fano-Anderson model on the basis of a two-dimensional optical waveguide array with a bi-modal defect. We demonstrate numerically the persistence of the Fano resonance in wavepacket scattering process by the defect. An analytical approximation is derived for the total scattered light power. c © 2008 Optical Society of America OCIS codes: 190.0190, 19...

A space-variant optical correlator is proposed on the basis of the fractional Fourier transform. The optical device uses as a recording medium for the holographic filter a photorefractive Bi(12)GeO(2) (BGO) crystal. The experimental results confirm the shift-variance properties. Some limitations that arise from the volume diffraction are also considered.

In this paper, the parameterization of bi-directional reflectances of vegetation is made possible by using multi-temporal SPOT satellite images. Five SPOT images scanned within two weeks are used. The woods near the Taichung port in central Taiwan are selected. An atmospheric correction model is applied to remove the atmospheric effect of the satellite images. Aerosol optical depth (AOD) is ret...

Aims. To test if the irregularly variable optical emission of hot stars in the Small Magellanic Cloud is due to variable amounts of Brehmstrahlung by ionized material in the circumstellar environment. The light curve variability of this sample of hot stars (∼ 200 objects) is described by Mennickent et al. (2002). Methods. (1) Probing the relation between flux excess in the optical and in the ne...

Bi-functional nanoparticles (NPs) that consist of silica-coated magnetic cores and luminescent lanthanide (Ln) ions anchored on the silica surface via organic linker molecules are reported. Compared to individual Ln ions, the hybrid NPs show a drastically enhanced photoluminescence due to the efficient ligand-to-metal energy transfer in the Ln-loaded NPs: the new bi-functional NPs could be used...

The study of amino acid based nonlinear optical (NLO) materials with optimum physical properties is an important area due to their practical applications such as optical communication, optical computing, optical information processing, optical disk data storage, laser fusion reactions, laser remote sensing, colour display, medical diagnostics, etc. Also, microelectronic industries require cryst...

group Aut(M). Stability and Diophantine Geometry A structure M is said to be unstable if it interprets a bipartite graph (P,Q,R) with the feature that for each n there are ai ∈ P and bi ∈ Q for i = 1, . . . , n such that R(ai, bj ) if and only if i < j. A complete theory is unstable if some (any) model is unstable. If M is unstable (witnessed by (P,Q,R) ) and saturated, then there are ai and bi...

For magneto-optical(MO) recording media we propose particulate films with magnetic fine particles dispersed in binders. Using effective dielectric tensor Faraday rotation ~ and absorption coefficient -a-are calculated for the particulate films containing Bi-substituted YIG and Co fine particles. The MO figure of merit O'~ of the particulate films exceeds that of continuous magnetic films. This ...