折射率较小（光在其中传播速率较大）的光介质叫光疏介质。
光疏介质（optically thinner medium）和光密介质（optically denser medium）：两种介质比较，折射率小的介质叫___________介质；折射率大的介质叫___________介质.
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... deviation 偏向，偏差 optically less dense medium 光疏介质 device 装置，设计，器件 ...
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在光疏介质一边有消逝波产生，其穿透深度仅波长数量级。
The evanescent wave rapidly decays with increasing distance from the interface, typically within a distance of one wavelength.
而对于下半空间为带消散损耗的单负光疏介质时，仅TM波或TE波之一的古斯—汉森位移是负的。
However, as for the dissipative loss medium with only one of permittivity and permeability being negative, the TM or TE polarization incident wave has a negative Goos-Hanchen shift accordingly.
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