Negative optical phenomena

Negative refractive index meta-materials are new kinds of artificial materials having both negative permittivity and negative permeability. Some negative optical phenomena can be anticipated with negative index, such as inverse Doppler effect, anomalous Cerenkov radiation, and negative refraction. The peculiar properties of meta-materials have been experimentally confirmed, and have aroused strong concern these years. However, negative optical phenomena do not always occur in negative refractive index media. Here we review various negative optical phenomena of meta-materials and other materials. Our recent progress is also given.