فهرست مقالات Transverse Mode

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  1 - The impact of higher order modes on transverse mode instability in bent optical fiber amplifiers
  Sajjad Vazeerpour Mahdi Shayganmanesh Davoud Dorranian
  10.30495/jtap.162215
  We present a new theoretical model for analyzing the impact of higher order modes on transverse mode instability in bent Yb-doped fiber amplifiers. The model indicates a comparative analysis of mode instability using the normalized propagation constant in straight and b چکیده کامل

  We present a new theoretical model for analyzing the impact of higher order modes on transverse mode instability in bent Yb-doped fiber amplifiers. The model indicates a comparative analysis of mode instability using the normalized propagation constant in straight and bent fibers amplifiers. The impact of different bending radii, in bent fibers is investigated on the normalized propagation constant. The results are then compared with the straight fibers. Considering all the existed modes, the behavior of mode instability in the fibers with different V-numbers are simulated and explained physically. پرونده مقاله
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  2 - Investigation on the dependence of optical spectra of silver chiral nanostructures on shape, dimensions and incident light by discrete dipole approximation
  Fatemeh Abdi Araz Siabi-Garjan Hadi Savaloni
  10.1186/2251-7235-6-11
  AbstractExtinction spectra of chiral silver nanostructures are calculated by means of Discrete Dipole Approximation (DDA). Dependence of Plasmonic peaks to both structural parameters of nanostructures and direction of the incident light are obtained. This dependence is چکیده کامل

  AbstractExtinction spectra of chiral silver nanostructures are calculated by means of Discrete Dipole Approximation (DDA). Dependence of Plasmonic peaks to both structural parameters of nanostructures and direction of the incident light are obtained. This dependence is investigated on variation of chiral dimensions, chiral shape and direction of incident light. We have observed a resonance peak of transverse mode (TM) for the extinction spectra of chiral structure at normal incidence. However, for oblique angle incident light, in addition to the TM mode, a longitudinal mode (LM) appears at longer wavelengths. The latter undergoes a shift to longer wavelengths with increasing the diameter of chirl arm. When the cross-section of chiral is changed to an oval this resonance peak disappears, while some other peaks appear at longer wavelengths that were not present for a chiral with circular cross-section. Extinction spectra of chiral nanostructure with different structural parameters and different rise angles (slanted chirals) showed dependence on the incident light direction. پرونده مقاله