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Exact solutions of Maxwell's equations describing the lightwavethrough 3-layer-structured cylindrical waveguide are obtained andthe mode field diameter and nonlinear coefficient of air-corenanowires (ACNWs) are numerically calculated. The simulation resultsshow that ACNWs offer some unique optical properties, such as tightfield confining ability and extremely high nonlinearity. At acertain wavelength and air core radius, we optimize the waveguidedesign to maximize the nonlinear coefficient and minimize the modefield diameter. Our results show that the ACNWs may be powerfulpotential tools for novel micro-photonic devices in the near future. 相似文献
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A kind of ultra-narrow dual-channel filter is proposed in principle and demonstrated experimentally. This filter is designed by means of two sampled fibre Bragg gratings （SFBGs）, where one is periodic O-π sampling and the other is symmetrical spatial sampling. The former can create two stopbands in the transmission spectra and the latter can produce two ultra-narrow passbands. Our filter has the 3-dB bandwidth of about 1 pm, whose value is two orders of magnitude less than the bandwidth of the traditional SFBG filters. The proposed filter has a merit that the channel spacing remains unchanged when tuning the filter. 相似文献
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