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首页> 外文会议>IEEE International Symposium on Antennas and Propagation >Gaussian Beam Diffraction by the Inverse Prism
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Gaussian Beam Diffraction by the Inverse Prism

机译：高斯光束衍射反向棱镜

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摘要

We study the diffraction of a Gaussian beam from the recently introduced inverse prism, which is a medium that is instantaneously switched between an isotropic state and a uniaxial state. The study is done by expanding all the fields in terms of their angular spectra, using previously derived temporal Fresnel coefficients for the s- and p-polarizations. It is found that the envelope of the beam strongly varies over time, as a result of the different velocities of the angular spectrum components induced by the production of new frequencies at the time discontinuity. This spatiotemporal diffraction effect, requiring both temporal discontinuity and spatial dispersion, is very unusual, and is reported here for the first time to authors' knowledge.
机译：我们研究了来自最近引入的逆棱镜的高斯光束的衍射，这是在各向同性状态和单轴状态之间瞬间切换的介质。通过针对S-and P偏振的先前导出的时间菲涅耳系数来扩展其角度光谱，通过扩展所有字段来完成研究。结果发现，由于当时不连续的新频率产生的角谱分量的不同速度，光束的包络随着时间的推移而变化。这种时空衍射效应，需要时间不连续性和空间色散，是非常不寻常的，并且在这里首次向作者的知识报告。

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