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The transmission and reflection properties of Faraday rotators are investigated by use of the boundary-value approach. Transmission and reflection coefficient matrices are derived from boundary conditions and transmission and reflection functions. The performances of extinction ratio and insertion and return losses of Faraday rotators are calculated for yttrium iron garnet, bismuth-substituted iron garnet, and BiCaInVIG (a non-rare-earth iron garnet) Faraday rotators.

To the best of our knowledge this is the first time a new optical isolator has been developed that uses BiCaInVIG, a non-rare-earth iron garnet. The device has high isolation > 40 dB with an insertion loss of 1.0 dB at 1.3-[Mu]m wavelength and > 43 dB with 1.1 dB at 1.52-[Mu]m wavelength, including Fresnel reflection losses of [difference] 0.8 dB for two polarizers. In addition, the device is inexpensive. In order to adjust maximum isolation when the isolator is assembled, a theoretical basis is presented, and the calculated values are in good agreement with the experimental results. Key words: Optics, optical-fiber communications, optical isolators.

Protein-conjugated [Ag.sub.2]S nanorods are prepared in aqueous solution and high-resolution transmission electron microscopy (HRTEM) is used for tracking the whole process of the nanorod growth. The results have shown that the final products are formed via two-step oriented attachment, particle-particle and rod-rod oriented.