We synthesized a new magneto-optical nanoparticle material Bi1.8Y 1.2Fe4Ga1O12 (BYIGG) with
substitution of gallium by iron. It was prepared using coprecipitation and annealing processes. High
Energy ball-milling was used to mill the nanoparticle to tens of nanometer range. The thin-film coated
shows improvement of transmittance because of the substitution. A simple model for scattering and
Faraday Effect was used to calculate the transmittance and Faraday Rotation angle, which shows have
a good match with the known experimental result.
Bismuth Iron Gallium Garnet (BI3Fe5-xGaxO12, BIGG) has been synthesized by pulsed laser deposition method and their comprehensive characterizations are reported. X-ray diffraction analyses have proved that the BIGG films are of good epitaxial quality. Faraday experiments verify the BIGG's high Faraday rotation. BIGG film is more transparent than Bismuth Iron Garnet film especially at wavelengths shorter than 550nm. Figure of merit of BIGG films θF/-log (T)are greatly improved than that of original BIG films. High speed pulse response experiments of our BIGG films have reached 5ns.
In this paper, we present a new class of broadband spectral filters based on aperiodic multilayer structures that reduce the required number of layers. Furthermore, the filter performance is optimized by Genetic algorithm, which is particular useful for optimizing arbitrary shape broadband filter. Quantitative computer simulation results are provided, which are consistent with theory. We believe that thee unique broadband filters may have a variety of applications in th area of broadband spectroscopy and hyperspectral imaging.