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Two original computer codes for the design of rare-earth-doped dielectric microspheres have been ad hoc developed. The former code is based on a finite-difference time-domain algorithm, suitably extended to model the amplification of the whispering-gallery modes propagating into rare-earth-doped microspheres. It takes into account the wavelength dispersion of the microsphere refractive index and the...
The demand for efficient optical active devices operating in the near and medium infrared wavelength ranges is originated from different needs. This wavelength band is of strong interest in a number of applications as remote sensing, sensors, optical communication, medical and military technology. The paper is a review on the NIR and MID-IR fiber NIR, also with reference to the host materials and...
In this paper the design of an active InP-based buried waveguide is proposed in order to realize the amplification of the electric field at a specific operation wavelength. The waveguide includes Bragg mirrors, designed to operate in the third telecommunication window, which confine a mode, tuned at the band edge wavelength, inside the active region. The analysis of gain and its saturation effects...
A brief overview on integrated optical sensors for environment monitoring is given. A variety of optical transducers is illustrated and the interaction between the evanescent electromagnetic field and the polluted medium under detection is described in detail. A chemically selective layer on the waveguide core binds and/or absorb the polluting molecules contained in the liquid or gaseous sample. The...
Genetic algorithms (GAs) have been successfully employed in a number of applied electromagnetism problems. They constitute attractive and intriguing optimization tools because of their efficiency, versatility and strength. In particular, their operation strategy is noticeably for its capability to identify solutions in complex multi-dimension spaces. This paper, at first, gives an admittedly incomplete...
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