We concentrated on superlens effect, the most promising effect of LHM, and photonic crystals, which bear some analogy to LHM but distinguished from LHM.

• 文中着重综述了两个方面的内容：一是左手介质最有应用前景的超透镜效应；二是与左手介质相关而又有所区别的光子晶体。