The methods to realize left-handed medium are reviewed, including combination of split ring resonators (SRRs) with thin metal wires, and those beyond SRRs.

• 本文从理论构想和实验两个方面对左手材料做了详细的综述，围绕负折射频率从微波到近红外的研究进展这一主线，具体介绍了实现左手介质的方法。