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Theory of surface polariton generation through grating couplers

机译:通过光栅耦合器产生表面极化的理论

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We discuss the theory of surface polariton generation by grating couplers. The emphasis is on an analysis of the manner in which the grating may modify the frequency spectrum of a shaped incident pulse. If L is the length of the portion of the grating illuminated by the incident beam, then we find that the frequency spectrum of the incident pulse can be transmitted to the surface polariton undistorted if the criterion L≪Vg/σ is satisfied, where Vg is the group velocity of the surface polariton and σ is a measure of the spread of frequencies in the incident beam used to excite the surface polaritons. If this criterion is not satisfied, the frequency spectrum of the transmitted pulse will be narrower than that in the incident pulse. The treatment here provides expressions for the absolute amplitude and shape of the transmitted signal, within the framework of a method that assumes the height of the grating is small.
机译:我们讨论了光栅耦合器产生表面极化的理论。重点在于分析光栅可以修改成形入射脉冲的频谱的方式。如果L是入射光束照射的光栅部分的长度,那么我们发现,如果满足标准L≪Vg /σ,则入射脉冲的频谱可以不失真地传输到表面极化子,其中Vg为表面极化子的群速度和σ是用于激发表面极化子的入射光束中频率分布的量度。如果不满足该标准,则发射脉冲的频谱将比入射脉冲的频谱窄。在假设光栅高度小的方法的框架内,此处的处理提供了所发射信号的绝对幅度和形状的表达式。

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    《Journal of Applied Physics》 |1977年第7期|P.2918-2926|共9页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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