The methods to realize left - handed medium are reviewed , including combination of split ring resonators ( srrs ) with thin metal wires , and those beyond srrs 本文從理論構(gòu)想和實(shí)驗(yàn)兩個(gè)方面對(duì)左手材料做了詳細(xì)的綜述,圍繞負(fù)折射頻率從微波到近紅外的研究進(jìn)展這一主線(xiàn),具體介紹了實(shí)現(xiàn)左手介質(zhì)的方法。