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PERIODIC ELECTROMAGNETIC WAVEGUIDE STRUCTURES WITH CONTROLLED POLARIZATION PROPERTIES
PERIODIC ELECTROMAGNETIC WAVEGUIDE STRUCTURES WITH CONTROLLED POLARIZATION PROPERTIES
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机译:具有可控极化特性的周期性电磁波结构
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摘要
By judicious engineering of grating parameters such as tooth shape, duty cycle and phase offset, the grating strengths and effective indices of the polarization modes of a grated waveguide are adjusted over a wide range of values to achieve a desired level of polarization sensitivity, or insensitivity. In the typical example, the physical geometry of the grating teeth is adjusted so that degenerate behavior (nTE = nTM and KTE = KTM) is obtained for two polarization modes; the effective refractive indices and grating strengths are matched for the TE and TM polarization modes. In the current embodiment the sidewall gratings are used in which the tooth profile is selected in order to equalize the grating strength for each polarization mode.
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