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scattering loss in optical waveguide with trapezoidal cross section

Journal of Central South University 2012年第5期19卷 1317-1321页

作者：彭文强吴宇列刘勇尹自强 College of Mechatronics Engineering and Automation National University of Defense Technology

To get the scattering loss of the trapezoidal core waveguide,a new analysis model is presented based on the perturbation equivalent method and modified effective-index ***,the trapezoidal core waveguide is successfully equivalent to the rectangular one with both restricting the same optical field energy by adopting the perturbation method,Then,the equivalent rectangular core waveguide is decomposed into two slab waveguides by employing the modified effective-index method,The trapezoidal core waveguide scattering theory model is established based on the slab waveguide scattering *** the sidewalls surface roughness in the range from 0 to 100 nm in the single model trapezodial core waveguide,optical simulation shows excellent agreement with the results from the scattering loss model *** relationship between the dimension and side-wall roughness with the scattering loss can be determined in the trapezoidal core waveguide by the scattering loss model.

关键词： trapezoidal core waveguide perturbation equivalent method modified effective-index method scattering loss

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引用

Science China(Technological Sciences) 2022年第1期65卷 131-138页

作者： YANG Chang WANG ZongQiang XIAO FuLiang HE ZhaoGuo XIE YanQiong ZHANG Sai HE YiHua LIU Si ZHOU QingHua School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410114China Sate Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Planetary Environmental and Astrobiological Research Laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai 519082China College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China

Electromagnetic ion cyclotron(EMIC)emission is an efficient mechanism for scattering loss of energetic ***,we report an event that provides both in-situ observation of energetic proton differential fluxes in the inner magnetosphere and precipitation of protons at ionospheric *** the 7-8 September 2015 geomagnetic storm the Van Allen Probes observed strong EMIC waves around L=5 and a distinct decrement in fluxes of tens of keV protons around pitch angles 0°-45°.Meanwhile,precipitating protons at ionospheric altitudes were found to significantly enhanced(by several orders of magnitude),measured by NOAA 18 and 19 when they magnetically linked to the Van Allen *** solving the Fokker-Planck diffusion equation,we show that EMIC waves can efficiently produce loss of energetic protons within about 2 h in the pitch angle range of~0°-45°,comparable to the satellite observations.

关键词： wave-particle interaction EMIC waves energetic proton scattering loss

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